Faculty Profiles - MENJO Hiroaki

写真a

MENJO Hiroaki

Organization

Institute for Space-Earth Environmental Research Division for Cosmic Ray Research Assistant Professor

Graduate School

Graduate School of Science

External link

Degree 1

Doctor (Science) （ 2009.6 Nagoya University ）

To the head of Degree.▲

Research Interests 3

Neutrino
High-Energy Cosmic-ray
Hadronic Interaction

To the head of Research Interests.▲

Research Areas 1

Natural Science / Particle, nuclear, cosmic-ray, and astrophysics - experiment

To the head of Research Areas.▲

Current Research Project and SDGs 3

高エネルギー宇宙線のためのLHC加速器を用いたハドロン相互作用の研究
Precise estimation of atmospheric neutrino flux
Neutrino study with Super-Kamiokande detector

To the head of Current Research Project and SDGs.▲

Research History 4

Nagoya University Institute for Space-Earth Environmental Research Division for Cosmic Ray Research Assistant Professor

2018.6
名古屋大学リーディング大学院フロンティア宇宙プログラム・特任助教

2013.3 - 2018.5

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Country：Japan
Kobayashi Maskawa Institute, Nagoya University. Assistant Professor

2011.1 - 2013.3

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Country：Japan
INFN Florence, Post-doctor

2009.7 - 2010.12

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Country：Italy

To the head of Research History.▲

Education 2

Nagoya University Graduate School, Division of Natural Science

2005.4 - 2009.6

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Country： Japan
Nagoya University Faculty of Science

1999.4 - 2003.3

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Country： Japan

To the head of Education.▲

Professional Memberships 2

日本物理学会
日本物理学会

To the head of Professional Memberships.▲

Papers 107

Sensitivity of the Hyper-Kamiokande experiment to neutrino oscillation parameters using accelerator neutrinos Reviewed International coauthorship International journal Open Access

Abe, K; Afif, MT; Laamara, RA; Aihara, H; Ajmi, A; Akutsu, R; Alarakia-Charles, H; Alekseev, I; Hakim, YA; Monsalve, SA; Amato, E; Ameli, F; Anthony, L; Araya, A; Quiroga, AA; Arimoto, S; Asaoka, Y; Ashida, Y; Aushev, V; Merelo, FB; Barbi, M; Barr, G; Batkiewicz-Kwasniak, M; Beauchêne, A; Benchekroun, D; Berardi, V; Bernardini, E; Berns, L; Bhadra, S; Bhuiyan, N; Bian, J; Bianco, D; Blanchet, A; Blondel, A; Boistier, PMM; Bolognesi, S; Bonavera, L; Bonilla, JL; Bordoni, S; Bose, D; Boyd, S; Bozza, C; Bravar, A; Bronner, C; Bubak, A; Buchowicz, A; Avanzini, MB; Burton, G; Cafagna, FS; Calabria, NF; Mozota, JMC; Cao, S; Carabadjac, D; Cartwright, S; Casado, MP; Catanesi, MG; Cavanagh, C; Cebrián, S; Chakir, EM; Chakrabarty, S; Choi, JH; Choquet, A; Choubey, S; Martinez, EAC; Chytka, L; Cicerchia, M; Barrio, LC; Cieslar, M; Coleman, J; Collazuol, G; Cook, L; Cormier, F; Costas-Rodríguez, D; Craplet, A; Cuen-Rochin, S; Dalmazzone, C; Danilov, M; Daoud, M; Daret, T; De Cos, FJ; de la Fuente, E; De Lorenzis, A; De Rosa, G; Dealtry, T; Della Valle, M; Densham, C; Dergacheva, A; Devi, MM; Di Lodovico, F; Di Nitto, A; Di Nola, A; López, GD; Dieminger, TC; Divecha, D; Dobrzynska, M; Dohnal, T; Doyle, T; Drakopoulou, E; Drapier, O; Galvan, CD; Dumarchez, J; Dygnarowicz, K; Earle, S; Eguchi, A; El Abassi, A; El Baz, M; El Kaftaoui, A; Ellis, J; Elmansali, R; Emery, S; Er-Rabit, R; Ershova, A; Esmaili, A; Bosch, RE; Eurin, G; Anaya, CEF; Morales, LEF; Fannon, J; Fedotov, S; Feltre, M; Feng, J; Ferlewicz, D; Fernández-Menéndez, P; Fernández-Martinez, E; Ferrario, P; Ferrazzi, B; Finch, A; Finley, C; Aguirre, GAF; Fitton, M; Franks, M; Friend, M; Fujii, Y; Fukuda, Y; Fusco, L; Gaior, R; Galinski, G; Goñi, RG; Gao, J; Riesgo, FG; Garde, C; Gaur, R; Gialanella, L; Giganti, C; Gligorov, V; Gogota, O; Gola, M; Goldsack, A; Gomez-Cadenas, JJ; Gonin, M; González-Nuevo, J; Gorin, A; Gornea, R; Goto, S; Gouighri, M; Rodriguez, JG; Graham, K; Gramegna, F; Grassi, M; Griguer, H; Guigue, M; Hadley, D; Hambardzumyan, A; Harada, M; Harris, RJ; Hartz, M; Harvey-Fishenden, E; Hassani, S; Hastings, NC; Hayashida, S; Hayato, Y; Hayrapetyan, K; Heitkamp, I; Hernandez-Molinero, B; Morata, JAH; Bosch, VH; Hino, Y; Hiraide, K; Holeczek, J; Holin, A; Horiuchi, S; Hoshina, K; Hosokawa, K; Hoummada, A; Hruby, F; Hua, H; Hultqvist, K; Iacob, F; Ichikawa, AK; Ibnsalih, WI; Ieki, K; Ikeda, M; Inácio, AS; Ioannisian, A; Ishida, T; Ishidoshiro, K; Ishino, H; Ishitsuka, M; Israel, H; Ito, H; Itow, Y; Izmaylov, A; Izumiyama, S; Jamieson, B; Jang, J; Jenkins, S; Jesús-Valls, C; Jo, HS; Jones, TP; Jonsson, P; Joo, KK; Joshi, S; Kajita, T; Kakuno, H; Kalousis, L; Kameda, J; Kano, Y; Karlen, D; Kataoka, Y; Kato, A; Katori, T; Kazarian, N; Khabibullin, M; Khotjantsev, A; Kikawa, T; Kim, JY; King, S; Kisiel, J; Klimaszewski, J; Kneale, L; Kobayashi, M; Kobayashi, T; Kodama, S; Koerich, L; Kolev, N; Komaba, H; Konaka, A; Kormos, L; Kose, U; Koshio, Y; Kosinski, T; Kouzakov, K; Kowalik, K; Kralik, R; Kravchuk, L; Kryukov, A; Kudenko, Y; Kulkarni, A; Kumita, T; Kurjata, R; Kutter, T; Kuze, M; Kvita, J; Kwak, K; Kwon, E; Labarga, L; Lachner, K; Lagoda, J; Lamanna, G; James, ML; Langella, A; Laporte, J; Latham, N; Laveder, M; Lavitola, L; Lawe, M; Le Blévec, E; Lee, J; Leitner, R; Levorato, S; Lewis, S; Li, B; Li, Q; Li, X; Lim, I; Limbu, U; Lindner, T; Litchfield, RP; Liu, Y; Long, K; Longhin, A; López-Gejo, F; Moreno, AL; Lorens, P; Lu, P; Lu, X; Ludovici, L; Lux, T; Maekawa, Y; Magaletti, L; Mahesh, J; Maimí, P; Makida, Y; Malek, M; Malinsky, M; Mandal, M; Mandokoro, Y; Mansoor, M; Marchi, T; Mariani, C; Marinelli, A; Markou, C; Maroufkhani, F; Martens, K; Marti, L; Martin, J; Martinez, L; Martini, M; Marzec, J; Matsubara, T; Matsumoto, R; Matusiak, M; Mazurek, K; McCauley, N; Medhi, A; Mefodiev, A; Mehta, P; Melbourne, WJD; Mellet, L; Mendez-Esteban, D; Maco, JM; Menjo, H; Zavala, GDM; Mezzetto, M; Migenda, J; Migliozzi, P; Miki, S; Mikola, V; Miller, E; Minamino, A; Mine, S; Mineev, O; Miura, M; Moharana, R; Mollo, CM; Mondal, T; Monrabal, F; Moon, CS; Moon, DH; Mas, FJM; Morescalchi, L; Moriyama, S; Mueller, TA; Nakadaira, T; Nakagiri, K; Nakahata, M; Nakai, S; Nakajima, Y; Nakamura, K; Nakamura, KD; Nakano, Y; Nakaya, T; Nakayama, S; Machado, LN; Naseby, C; Ng, WH; Niewczas, K; Ninomiya, K; Nishimori, S; Nishimura, Y; Noguchi, Y; Nosek, T; Nova, F; Nozka, L; Nugent, JC; Nunokawa, H; Nurek, M; O'Connor, E; O'Flaherty, M; O'Keeffe, HM; O'Sullivan, E; Obrebski, W; Ochoa-Ricoux, P; Ogitsu, T; Okazaki, R; Okumura, K; Onda, N; Orozco-Luna, F; Ospina, N; Ostrowski, M; Otani, N; Oyama, Y; Pac, MY; Paganini, P; Palacio, J; Pari, M; Park, J; Pasternak, J; Pastore, C; Pastuszak, G; Pate, C; Pavin, M; Payne, D; Mosquera, JP; Peña-Garay, C; de Perio, P; Périssé, L; Pinzino, J; Piotrowski, B; Playfer, S; Pointon, B; Ponticelli, E; Popov, A; Popov, B; Posiadala-Zezula, M; Pronost, G; Prouse, NW; Quach, C; Quilain, B; Radicioni, E; Rajda, P; Cascón, ER; Ramsden, R; Renner, J; Rescigno, M; Ricciardi, G; Richards, B; Richards, K; Riley, DW; Rimmer, J; Cabo, SR; Rogly, R; Roig-Tormo, E; Romo-Fuentes, MF; Rondio, E; Roskovec, B; Roth, S; Rott, C; Rubbia, A; Ruggeri, AC; Russo, S; Rychter, A; Ryu, D; Saenz, W; Sakashita, K; Samani, S; Sánchez, F; Rodríguez, MLS; Sandford, E; Santos, A; Rodríguez, JDS; Sarker, A; Sarmah, P; Sato, K; Sato, Y; Schloesser, C; Scott, M; Seiya, Y; Sekiguchi, T; Sekiya, H; Seo, JW; Sgalaberna, D; Shimizu, I; Shimizu, K; Shin, CD; Shinoki, M; Shiozawa, M; Shvartsman, A; Simonelli, A; Skrobova, N; Skwarczynski, K; Smithers, BR; Smy, M; Sobczyk, J; Sobel, HW; Soler, FJP; Sozzi, MS; Spina, R; Spisso, B; Spradlin, P; Stankevich, K; Stavropoulos, D; Stawarz, L; Stowell, P; Studenikin, A; Gomez, SLS; Suchenek, M; Sunanda; Suwa, Y; Suzuki, A; Suzuki, SY; Suzuki, Y; Svirida, D; Tada, M; Taghayor, S; Takeda, A; Takemoto, Y; Taketa, A; Takeuchi, Y; Takhistov, V; Tanaka, H; Tanaka, HKM; Tanaka, M; Tanigawa, H; Tashiro, T; Terada, K; Thiesse, M; Thrane, E; Tiwari, D; Alarcón, JFT; Sánchez, AKT; Tomiya, T; Tran, N; Tseng, J; Tsuchii, R; Tsui, KM; Tsukamoto, T; Tsushima, T; Tzanov, M; Uchida, Y; Urano, S; Urquijo, P; Vagins, M; Valder, S; Vallmajó, O; Vasseur, G; Vinning, B; Virginet, U; Vivolo, D; Vladisavljevic, T; Vogelaar, R; Vyalkov, M; Wachala, T; Wark, D; Wendell, R; Wilson, JR; Wilson, S; Wojciechowski, M; Wronka, S; Wuethrich, J; Xia, J; Xie, Z; Yamaguchi, Y; Yamamoto, K; Yamashita, M; Yamauchi, K; Yang, BS; Yano, T; Yershov, N; Yevarouskaya, U; Yokoyama, M; Yoo, J; Yoshida, T; Yoshimoto, Y; Yoshioka, Y; Yousefnejad, S; Yu, I; Yu, T; Yuriy, O; Zaldivar, B; Zalipska, J; Zaremba, K; Zarnecki, G; Zhao, X; Zhong, H; Zhu, T; Ziembicki, M; Zietara, K; Zito, M; Zsoldos, S

EUROPEAN PHYSICAL JOURNAL C Vol. 86 ( 2 ) 2026.2

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Language：English Publishing type：Research paper (scientific journal) Publisher：European Physical Journal C

This paper presents the expected sensitivity to the neutrino oscillation parameters of the Hyper-Kamiokande long-baseline program. The Hyper-Kamiokande experiment, currently under construction in Japan, will measure the oscillations of accelerator-produced neutrinos with thousands of selected events per sample: this corresponds to an increase of statistics of a factor 25–100 with respect to recent results from the currently-running long-baseline neutrino oscillation experiment in Japan, T2K. In the most favorable scenario we will achieve the discovery of Charge-Parity (CP) violation in neutrino oscillation at 5σ C.L. in less than 3 years. With 10 years of data-taking, and assuming a neutrino : antineutrino beam running ratio of 1:3, a CP violation discovery at 5σ C.L. is possible for more than 60% of the actual values of the CP-violating phase, δCP. Moreover, we will measure δCP with a precision ranging from 20∘, in the case of maximal CP violation, to 6∘, in the case of CP conservation. We aim to achieve a 0.5% resolution on the Δm322 parameter, and a resolution between 3% and 0.5% on the sin2θ23 parameter, depending on its true value. These results are obtained by extending the analysis methods of T2K with dedicated tuning to take into account the Hyper-Kamiokande design: the larger far detector, the more powerful beam, the upgraded near detector ND280, and the planned additional Intermediate Water Cherenkov Detector.

DOI： 10.1140/epjc/s10052-025-14938-9

Open Access

Web of Science

Scopus
Global tuning of hadronic interaction models with accelerator-based and astroparticle data Reviewed International coauthorship

Albrecht, J; Tjus, JB; Behling, N; Blazek, J; Bleicher, M; Boelhauve, J; Cazon, L; Conceiçao, R; Dembinski, H; Dietrich, L; Ebr, J; Ellbracht, J; Engel, R; Fedynitch, A; Fieg, M; Garzelli, MV; Gaudu, C; Graziani, G; Gutjahr, P; Haungs, A; Huege, T; Hymon, K; Hünnefeld, M; Kampert, KH; Kardum, L; Kolk, L; Korneeva, N; Kröninger, K; Maire, A; Menjo, H; Morejon, L; Ostapchenko, S; Paakkinen, P; Pierog, T; Plotko, P; Prosekin, A; Pyras, L; Pöschl, T; Rautenberg, J; Reininghaus, M; Rhode, W; Riehn, F; Roth, M; Sandrock, A; Sarcevic, I; Schmelling, M; Sigl, G; Sjöstrand, T; Soldin, D; Unger, M; Utheim, M; Vícha, J; Werner, K; Windau, ME; Zhukov, V

NATURE REVIEWS PHYSICS Vol. 8 ( 2 ) page： 98 - 114 2026.2

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Language：English Publishing type：Research paper (scientific journal) Publisher：Nature Reviews Physics

In high-energy and astroparticle physics, event generators have an essential role, even in the simplest data analyses. Physical processes occurring in hadronic collisions are simulated within a Monte Carlo framework but a major challenge remains modelling of hadron dynamics at low momentum transfer, which includes the initial and final phases of every hadronic collision. Phenomenological models inspired by quantum chromodynamics used for these phases cannot guarantee completeness or correctness over the full phase space. These models usually include parameters which must be tuned to suitable experimental data. Until now, event generators have primarily been developed and tuned based on data from high-energy physics experiments at accelerators. However, in many cases, they have been found to not satisfactorily describe data from astroparticle experiments, which provide sensitivity especially to hadrons produced nearly parallel to the collision axis and cover centre-of-mass energies up to several hundred tera-electronvolts, well beyond those reached at colliders so far. Here, we address the complementarity of these two sets of data and present a roadmap for a unified tuning of event generators with accelerator-based and astroparticle data.

DOI： 10.1038/s42254-025-00897-3

Web of Science

Scopus
Search for nucleon decay via p → νπ+ and n → νπ0 in 0.484 Mton-year of Super-Kamiokande data Reviewed International coauthorship International journal

Jung, S; Abe, K; Asaoka, Y; Harada, M; Hayato, Y; Hiraide, K; Hung, TH; Ieki, K; Ikeda, M; Kameda, J; Kanemura, Y; Kataoka, Y; Miki, S; Mine, S; Miura, M; Moriyama, S; Nakagiri, K; Nakahata, M; Nakayama, S; Noguchi, Y; Pronost, G; Sato, K; Sekiya, H; Shinoda, R; Shiozawa, M; Suzuki, Y; Takeda, A; Takemoto, Y; Tanaka, H; Yano, T; Chen, S; Itow, Y; Kajita, T; Nishijima, R; Okumura, K; Tashiro, T; Tomiya, T; Wang, X; Fernandez, P; Labarga, L; Samudio, D; Zaldivar, B; Yanagisawa, C; Jargowsky, B; Kearns, E; Mirabito, J; Wan, L; Wester, T; Pointon, BW; Bian, J; Cortez, B; Griskevich, NJ; Jiang, Y; Smy, MB; Sobel, HW; Takhistov, V; Yankelevich, A; Hill, J; Moon, DH; Park, RG; Yang, BS; Scholberg, K; Walter, CW; Drapier, O; Ershova, A; Ferey, M; Le Blévec, E; Mueller, TA; Paganini, P; Quach, C; Rogly, R; Nakamura, T; Jang, JS; Litchfield, RP; Machado, LN; Soler, FJP; Learned, JG; Choi, K; Cao, S; Anthony, LHV; Prouse, NW; Scott, M; Uchida, Y; Berardi, V; Calabria, NF; Catanesi, MG; Ospina, N; Radicioni, E; Langella, A; De Rosa, G; Collazuol, G; Feltre, M; Mattiazzi, M; Ludovici, L; Gonin, M; Périssé, L; Quilain, B; Horiuchi, S; Kawabata, A; Kobayashi, M; Liu, YM; Maekawa, Y; Nishimura, Y; Akutsu, R; Friend, M; Hasegawa, T; Hino, Y; Ishida, T; Kobayashi, T; Matsubara, T; Nakadaira, T; Oyama, Y; Yrey, AP; Sakashita, K; Sekiguchi, T; Bhuiyan, N; Burton, GT; Di Lodovico, F; Katori, T; Kralik, R; Latham, N; Ramsden, RM; Ito, H; Sone, T; Suzuki, AT; Takeuchi, Y; Wada, S; Zhong, H; Feng, J; Feng, L; Han, S; Hikida, J; Hu, JR; Hu, Z; Kawaue, M; Kikawa, T; Nakaya, T; Ngoc, TV; Wendell, RA; Jenkins, SJ; McCauley, N; Tarrant, A; Fanì, M; Wilking, MJ; Xie, Z; Fukuda, Y; Menjo, H; Yoshioka, Y; Lagoda, J; Mandal, M; Zalipska, J; Mori, M; Jiang, J; Hamaguchi, K; Ishino, H; Koshio, Y; Nakanishi, F; Tada, T; Ishizuka, T; Barr, G; Barrow, D; Cook, L; Samani, S; Wark, D; Holin, A; Nova, F; Yoo, J; Fannon, JEP; Kneale, L; Peacock, T; Stowell, P; Okazawa, H; Lakshmi, SM; Kwon, E; Lee, MW; Seo, JW; Yu, I; Ashida, Y; Ichikawa, AK; Nakamura, KD; Abe, S; Goto, S; Hayasaki, H; Kodama, S; Kong, Y; Masaki, Y; Mizuno, Y; Muro, T; Nakajima, Y; Taniuchi, N; Yokoyama, M; de Perio, P; Fujita, S; Jesús-Valls, C; Martens, K; Marti, L; Santos, AD; Tsui, KM; Vagins, MR; Kuze, M; Izumiyama, S; Matsumoto, R; Asaka, R; Ishitsuka, M; Sugo, M; Wako, M; Yamauchi, K; Nakano, Y; Cormier, F; Gaur, R; Hartz, M; Konaka, A; Li, X; Smithers, BR; Chen, S; Wu, Y; Xu, BD; Zhang, AQ; Zhang, B; Adhikary, H; Girgus, M; Govindaraj, P; Posiadala-Zezula, M; Prabhu, YS; Boyd, SB; Edwards, R; Hadley, D; O'Flaherty, M; Richards, B; Ali, A; Jamieson, B; Bronner, C; Horiguchi, D; Minamino, A; Sasaki, Y; Shibayama, R; Shimamura, R

PHYSICAL REVIEW D Vol. 113 ( 1 ) 2026.1

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1103/gwc6-55bg

Web of Science
First Associated Neutrino Search for a Failed Supernova Candidate with Super-Kamiokande Reviewed International coauthorship

Nakanishi, F; Abe, K; Abe, S; Asaoka, Y; Harada, M; Hayato, Y; Hiraide, K; Hosokawa, K; Hung, TH; Ieki, K; Ikeda, M; Kameda, J; Kanemura, Y; Kataoka, Y; Miki, S; Mine, S; Miura, M; Moriyama, S; Nakahata, M; Nakayama, S; Noguchi, Y; Pronost, G; Sato, K; Sekiya, H; Shiozawa, M; Suzuki, Y; Takeda, A; Takemoto, Y; Tanaka, H; Yano, T; Itow, Y; Kajita, T; Nishijima, R; Okumura, K; Tashiro, T; Tomiya, T; Wang, X; Fernandez, P; Labarga, L; Zaldivar, B; Pointon, BW; Yanagisawa, C; Kearns, E; Wan, L; Wester, T; Bian, J; Cortez, B; Griskevich, NJ; Jiang, Y; Smy, MB; Sobel, HW; Takhistov, V; Yankelevich, A; Hill, J; Jang, MC; Lee, SH; Moon, DH; Park, RG; Yang, BS; Bodur, B; Scholberg, K; Walter, CW; Beauchêne, A; Blévec, L; Drapier, O; Ershova, A; Ferey, M; Mueller, TA; Santos, AD; Paganini, P; Quach, C; Rogly, R; Nakamura, T; Jang, JS; Litchfield, RP; Machado, LN; Soler, FJP; Learned, JG; Choi, K; Cao, S; Anthony, LHV; Prouse, NW; Scott, M; Uchida, Y; Berardi, V; Calabria, NF; Catanesi, MG; Ospina, N; Radicioni, E; Langella, A; De Rosa, G; Collazuol, G; Feltre, M; Mattiazzi, M; Ludovici, L; Gonin, M; Périssé, L; Quilain, B; Horiuchi, S; Kawabata, A; Kobayashi, M; Liu, YM; Maekawa, Y; Nishimura, Y; Akutsu, R; Friend, M; Hasegawa, T; Hino, Y; Ishida, T; Kobayashi, T; Jakkapu, M; Matsubara, T; Nakadaira, T; Oyama, Y; Yrey, AP; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Bhuiyan, N; Burton, GT; Di Lodovico, F; Gao, J; Katori, T; Kralik, R; Latham, N; Ramsden, RM; Ito, H; Sone, T; Suzuki, AT; Takeuchi, Y; Wada, S; Zhong, H; Feng, J; Feng, L; Han, S; Hikida, J; Hu, JR; Hu, Z; Kawaue, M; Kikawa, T; Ngoc, TV; Nakaya, T; Wendell, RA; Jenkins, SJ; Mccauley, N; Tarrant, A; Fanì, M; Wilking, MJ; Xie, Z; Fukuda, Y; Menjo, H; Yoshioka, Y; Lagoda, J; Mandal, M; Zalipska, J; Mori, M; Jiang, J; Hamaguchi, K; Ishino, H; Koshio, Y; Tada, T; Ishizuka, T; Barr, G; Barrow, D; Cook, L; Samani, S; Wark, D; Holin, A; Nova, F; Jung, S; Yoo, J; Fannon, JEP; Kneale, L; Malek, M; Mcelwee, JM; Peacock, T; Stowell, P; Thiesse, MD; Thompson, LF; Okazawa, H; Lakshmi, SM; Kwon, E; Lee, MW; Seo, JW; Yu, I; Ashida, Y; Ichikawa, AK; Nakamura, KD; Goto, S; Hayasaki, H; Kodama, S; Kong, Y; Masaki, Y; Mizuno, Y; Muro, T; Nakagiri, K; Nakajima, Y; Taniuchi, N; Yokoyama, M; De Perio, P; Fujita, S; Jesús-Valls, C; Martens, K; Marti, L; Tsui, KM; Vagins, MR; Xia, J; Kuze, M; Izumiyama, S; Matsumoto, R; Asaka, R; Ishitsuka, M; Sugo, M; Wako, M; Yamauchi, K; Nakano, Y; Cormier, F; Gaur, R; Hartz, M; Konaka, A; Li, X; Smithers, BR; Chen, S; Wu, Y; Xu, BD; Zhang, AQ; Zhang, B; Adhikary, H; Girgus, M; Govindaraj, P; Posiadala-Zezula, M; Prabhu, YS; Boyd, SB; Edwards, R; Hadley, D; Nicholson, M; O'Flaherty, M; Richards, B; Ali, A; Jamieson, B; Bronner, C; Horiguchi, D; Minamino, A; Sasaki, Y; Shibayama, R; Shimamura, R

ASTROPHYSICAL JOURNAL LETTERS Vol. 997 ( 1 ) 2026.1

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.3847/2041-8213/ae2c73

Web of Science
Measurement of the branching ratio of 16N, 15C, 12B, and 13B isotopes through the nuclear muon capture reaction in the Super-Kamiokande detector Reviewed International coauthorship Open Access

Maekawa, Y; Abe, K; Abe, S; Asaoka, Y; Harada, M; Hayato, Y; Hiraide, K; Hosokawa, K; Ieki, K; Ikeda, M; Kameda, J; Kanemura, Y; Kataoka, Y; Miki, S; Mine, S; Miura, M; Moriyama, S; Nakahata, M; Nakayama, S; Noguchi, Y; Pronost, G; Sato, K; Sekiya, H; Shimizu, K; Shinoda, R; Shiozawa, M; Suzuki, Y; Takeda, A; Takemoto, Y; Tanaka, H; Yano, T; Itow, Y; Kajita, T; Nishijima, R; Okumura, K; Tashiro, T; Tomiya, T; Wang, X; Fernandez, P; Labarga, L; Samudio, D; Zaldivar, B; Yanagisawa, C; Kearns, E; Mirabito, J; Wan, L; Wester, T; Pointon, BW; Bian, J; Cortez, B; Griskevich, NJ; Jiang, Y; Smy, MB; Sobel, HW; Takhistov, V; Yankelevich, A; Hill, J; Jang, MC; Lee, SH; Moon, DH; Park, RG; Yang, BS; Bodur, B; Scholberg, K; Walter, CW; Beauchêne, A; Drapier, O; Ershova, A; Mueller, TA; Santos, AD; Paganini, P; Quach, C; Rogly, R; Nakamura, T; Jang, JS; Litchfield, RP; Machado, LN; Soler, FJP; Learned, JG; Choi, K; Iovine, N; Cao, S; Anthony, LHV; Martin, D; Prouse, NW; Scott, M; Uchida, Y; Berardi, V; Calabria, NF; Catanesi, MG; Ospina, N; Radicioni, E; Langella, A; De Rosa, G; Collazuol, G; Feltre, M; Mattiazzi, M; Ludovici, L; Gonin, M; Périssé, L; Quilain, B; Horiuchi, S; Kawabata, A; Kobayashi, M; Liu, YM; Nishimura, Y; Okazaki, R; Akutsu, R; Friend, M; Hasegawa, T; Hino, Y; Ishida, T; Kobayashi, T; Jakkapu, M; Matsubara, T; Nakadaira, T; Nakamura, K; Oyama, Y; Yrey, AP; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Bhuiyan, N; Burton, GT; Kralik, R; Latham, N; Di Lodovico, F; Gao, J; Katori, T; Migenda, J; Ramsden, RM; Xie, Z; Zsoldos, S; Ito, H; Sone, T; Suzuki, AT; Takagi, Y; Takeuchi, Y; Wada, S; Zhong, H; Feng, J; Feng, L; Han, S; Hikida, J; Hu, JR; Hu, Z; Kawaue, M; Kikawa, T; Nakaya, T; Ngoc, TV; Wendell, RA; Yasutome, K; Jenkins, SJ; McCauley, N; Tarrant, A; Fanì, M; Wilking, MJ; Xie, Z; Fukuda, Y; Menjo, H; Yoshioka, Y; Lagoda, J; Mandal, M; Prabhu, YS; Zalipska, J; Mori, M; Jia, M; Jiang, J; Shi, W; Hamaguchi, K; Ishino, H; Koshio, Y; Nakanishi, F; Sakai, S; Tada, T; Tano, T; Ishizuka, T; Barr, G; Barrow, D; Cook, L; Samani, S; Wark, D; Holin, A; Nova, F; Jung, S; Yang, JY; Yoo, J; Fannon, JEP; Kneale, L; Malek, M; McElwee, JM; Peacock, T; Stowell, P; Thiesse, MD; Thompson, LF; Wilson, ST; Okazawa, H; Lakshmi, SM; Kwon, E; Lee, MW; Seo, JW; Yu, I; Ichikawa, AK; Nakamura, KD; Tairafune, S; Eguchi, A; Goto, S; Hayasaki, H; Kodama, S; Masaki, Y; Mizuno, Y; Muro, T; Nakagiri, K; Nakajima, Y; Taniuchi, N; Watanabe, E; Yokoyama, M; de Perio, P; Fujita, S; Jesús-Valls, C; Martens, K; Marti, L; Tsui, KM; Vagins, MR; Xia, J; Izumiyama, S; Kuze, M; Matsumoto, R; Terada, K; Asaka, R; Ishitsuka, M; Shinoki, M; Sugo, M; Wako, M; Yamauchi, K; Yoshida, T; Nakano, Y; Cormier, F; Gaur, R; Gousy-Leblanc, V; Hartz, M; Konaka, A; Li, X; Smithers, BR; Chen, S; Wu, Y; Xu, BD; Zhang, AQ; Zhang, B; Girgus, M; Govindaraj, P; Posiadala-Zezula, M; Prabhu, YS; Boyd, SB; Edwards, R; Hadley, D; Nicholson, M; O'Flaherty, M; Richards, B; Ali, A; Jamieson, B; Amanai, S; Bronner, C; Horiguchi, D; Minamino, A; Sasaki, Y; Shibayama, R; Shimamura, R

PHYSICAL REVIEW C Vol. 112 ( 6 ) 2025.12

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Language：English Publishing type：Research paper (scientific journal) Publisher：Physical Review C

The Super-Kamiokande detector has measured solar neutrinos for more than 25 years. The sensitivity for solar neutrino measurement is limited by the uncertainties of energy scale and background modeling. Decays of unstable isotopes with relatively long half-lives through nuclear muon capture, such as 16N, 15C, 12B, and 13B, are detected as background events for solar neutrino observations. In this study, we developed a method to form a pair of stopping muon and decay candidate events and evaluated the production rates of such unstable isotopes. We then measured their branching ratios considering both their production rates and the estimated number of nuclear muon capture processes as Br(16N) = (9.0 ± 0.1)%,Br(15C) = (0.6 ± 0.1)%, Br(12B) = (0.98 ±0.18)%, Br(13B) = (0.14 ± 0.12)%, respectively. The result for 16N has world-leading precision at present and the results for 15C, 12B, and 13B are the first branching ratio measurements for those isotopes.

DOI： 10.1103/b93l-dbpj

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Development and Educational Benefits of Interactive Content for Visualizing Cosmic Ray Air Showers in a 3D Panoramic Sphere Open Access

Tomida T., Nakayama T., Kayama M., Takahashi K., Yuko I., Ikeda D., Menjo H., Hashimoto T.T., Higuchu R., Fujita K.

Proceedings of Science Vol. 501 2025.12

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：Proceedings of Science

High-energy cosmic rays induce extensive air showers (EAS) that develop from an altitude of approximately 10 km and reach the ground with footprints spanning several kilometers in diameter. Most cosmic ray exhibits in science museums rely on real-time detection of natural radiation at ground level, with limited emphasis on effectively conveying the dynamic nature of cosmic ray air showers. To address this, we have developed an interactive visualization tool that represents cosmic ray air showers within a three-dimensional (3D) panoramic celestial sphere. This content is designed for use in science museum exhibitions and educational events to enhance public interest in cosmic rays. Additionally, it serves as a valuable resource for STEAM education and elementary-level instruction on natural radiation. In this report, we present an analysis of the educational benefits of utilizing this content in science museum exhibits and elementary school classrooms in Japan.

DOI： 10.22323/1.501.1256

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Importance and required precision of the forward experiments at the LHC for testing a strangeness enhancement scenario of the muon puzzle International coauthorship Open Access

Ohashi K., Fedynitch A., Menjo H.

Proceedings of Science Vol. 501 2025.12

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：Proceedings of Science

The muon puzzle—the excess of muons observed in ultra-high-energy cosmic-ray air showers relative to simulation predictions—highlights our incomplete understanding of high-energy hadronic interactions. To resolve this discrepancy, each proposed solution must be subjected to direct experimental tests. In this work, we develop a framework to assess the strangeness enhancement scenario, wherein an increased yield of kaons relative to pions boosts muon production. Using the MCEq air-shower simulation package, we first identify the key phase-space regions of hadronic interactions that drive muon yields in this scenario. We then demonstrate that a synergistic analysis, combining Pierre Auger Observatory muon measurements with forthcoming kaon-to-pion ratio data from LHC Run 3, can robustly constrain the scenario’s parameters. In particular, we find that achieving 10.8 % precision on the kaon-to-pion ratio at LHCb and 8.4 % at FASER is sufficient to test the strangeness enhancement hypothesis over its viable parameter space. These upcoming experimental results will provide the first direct constraints on strangeness enhancement as a solution to the muon puzzle, marking a significant step toward its resolution.

DOI： 10.22323/1.501.0348

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Development of a hybrid air shower simulation tool COSMOS X Open Access

Sako T., Fujii T., Kasahara K., Menjo H., Ohishi M., Sakaki N., Taketa A., Tameda Y.

Proceedings of Science Vol. 501 2025.12

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：Proceedings of Science

Extended COSMOS, COSMOS X, is a major upgrade of the air shower simulation tool COSMOS, which has been developed since 1970’s. COSMOS X allows particle tracking not only in the atmosphere of the earth but in the arbitrary spherical media such as water, ice, scintillator, soil and concrete with a common center. This hybrid feature of COSMOS X extends the possibility of shower simulations in the atmosphere of stars and planets. In this contribution basic functions and some interesting applications of COSMOS X are presented. Recent samples include a simulation in the atmosphere of the Sun and an implementation of arbitrary interaction vertex, which allows a simulation of neutrino-initiated showers through external interaction generators.

DOI： 10.22323/1.501.0379

Open Access

Scopus
Search for neutron decay into an antineutrino and a neutral kaon in 0.401 megaton-years exposure of Super-Kamiokande Reviewed International coauthorship International journal Open Access

Yamauchi, K; Abe, K; Abe, S; Asaoka, Y; Harada, M; Hayato, Y; Hiraide, K; Hosokawa, K; Ieki, K; Ikeda, M; Kameda, J; Kanemura, Y; Kataoka, Y; Miki, S; Mine, S; Miura, M; Moriyama, S; Nakahata, M; Nakayama, S; Noguchi, Y; Pronost, G; Sato, K; Sekiya, H; Shimizu, K; Shinoda, R; Shiozawa, M; Suzuki, Y; Takeda, A; Takemoto, Y; Tanaka, H; Yano, T; Itow, Y; Kajita, T; Nishijima, R; Okumura, K; Tashiro, T; Tomiya, T; Wang, X; Fernandez, P; Labarga, L; Samudio, D; Zaldivar, B; Pointon, BW; Yanagisawa, C; Kearns, E; Mirabito, J; Wan, L; Wester, T; Bian, J; Cortez, B; Griskevich, NJ; Jiang, Y; Smy, MB; Sobel, HW; Takhistov, V; Yankelevich, A; Hill, J; Jang, MC; Lee, SH; Moon, DH; Park, RG; Yang, BS; Bodur, B; Scholberg, K; Walter, CW; Beauchene, A; Drapier, O; Ershova, A; Mueller, TA; Santos, AD; Paganini, P; Quach, C; Rogly, R; Nakamura, T; Jang, JS; Litchfield, RP; Machado, LN; Soler, FJP; Learned, JG; Choi, K; Iovine, N; Tiwari, D; Cao, S; Anthony, LHV; Martin, D; Prouse, NW; Scott, M; Uchida, Y; Berardi, V; Calabria, NF; Catanesi, MG; Ospina, N; Radicioni, E; Langella, A; De Rosa, G; Collazuol, G; Feltre, M; Mattiazzi, M; Ludovici, L; Gonin, M; Periss, L; Quilain, B; Horiuchi, S; Kawabata, A; Kobayashi, M; Liu, YM; Maekawa, Y; Nishimura, Y; Okazaki, R; Akutsu, R; Friend, M; Hasegawa, T; Hino, Y; Ishida, T; Kobayashi, T; Jakkapu, M; Matsubara, T; Nakadaira, T; Nakamura, K; Oyama, Y; Yrey, AP; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Bhuiyan, N; Burton, GT; Di Lodovico, F; Gao, J; Katori, T; Kralik, R; Migenda, J; Ramsden, RM; Zsoldos, S; Ito, H; Sone, T; Suzuki, AT; Takagi, Y; Takeuchi, Y; Wada, S; Zhong, H; Feng, J; Feng, L; Han, S; Hikida, J; Hu, JR; Hu, Z; Kawaue, M; Kikawa, T; Nakaya, T; Ngoc, TV; Wendell, RA; Yasutome, K; Jenkins, SJ; McCauley, N; Tarrant, A; Fani, M; Wilking, MJ; Xie, Z; Fukuda, Y; Menjo, H; Yoshioka, Y; Lagoda, J; Mandal, M; Zalipska, J; Mori, M; Jia, M; Jiang, J; Shi, W; Hamaguchi, K; Ishino, H; Koshio, Y; Nakanishi, F; Sakai, S; Tada, T; Tano, T; Ishizuka, T; Barr, G; Barrow, D; Cook, L; Samani, S; Wark, D; Holin, A; Nova, F; Jung, S; Yang, JY; Yoo, J; Fannon, JEP; Kneale, L; Malek, M; McElwee, JM; Peacock, T; Stowell, P; Thiesse, MD; Thompson, LF; Wilson, ST; Okazawa, H; Lakshmi, SM; Kwon, E; Lee, MW; Seo, JW; Yu, I; Ichikawa, AK; Nakamura, KD; Tairafune, S; Eguchi, A; Goto, S; Kodama, S; Mizuno, Y; Muro, T; Nakagiri, K; Nakajima, Y; Taniuchi, N; Watanabe, E; Yokoyama, M; De Perio, P; Fujita, S; Jesus-Valls, C; Martens, K; Marti, L; Tsui, KM; Vagins, MR; Xia, J; Izumiyama, S; Kuze, M; Matsumoto, R; Terada, K; Asaka, R; Ishitsuka, M; Shinoki, M; Sugo, M; Wako, M; Yoshida, T; Nakano, Y; Cormier, F; Gaur, R; Gousy-Leblanc, V; Hartz, M; Konaka, A; Li, X; Smithers, BR; Chen, S; Wu, Y; Xu, BD; Zhang, AQ; Zhang, B; Girgus, M; Govindaraj, P; Posiadala-Zezula, M; Prabhu, YS; Boyd, SB; Edwards, R; Hadley, D; Nicholson, M; O'Flaherty, M; Richards, B; Ali, A; Jamieson, B; Amanai, S; Bronner, C; Horiguchi, D; Minamino, A; Sasaki, Y; Shibayama, R; Shimamura, R

PHYSICAL REVIEW D Vol. 112 ( 9 ) page： 1 - 13 2025.11

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Language：English Publishing type：Research paper (scientific journal) Publisher：Physical Review D

We searched for bound neutron decay via n → ν̄ + K0 predicted by the grand unified theories in 0.401 Mton · years exposure of all pure water phases in the Super-Kamiokande detector. About 4.4 times more data than in the previous search have been analyzed by a new method including a spectrum fit to kaon invariant mass distributions. No significant data excess has been observed in the signal regions. As a result of this analysis, we set a lower limit of 7.8 × 1032 years on the neutron lifetime at a 90% confidence level.

DOI： 10.1103/thqt-8fp1

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Solar and Interplanetary Determinants of Long-term Solar Modulation of Cosmic-Ray Intensity for Median Rigidities of 11-107 GV Reviewed International coauthorship Open Access

Poopakun, K; Nuntiyakul, W; Kato, C; Munakata, K; Kozai, M; Hayashi, Y; Ruffolo, D; Iwai, K; Menjo, H; Zhai, LM; Duldig, ML

ASTROPHYSICAL JOURNAL Vol. 991 ( 2 ) 2025.10

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Language：English Publishing type：Research paper (scientific journal) Publisher：Astrophysical Journal

We investigate the long-term modulation of cosmic-ray (CR) intensity across median rigidities from 11 to 107 GV using over four decades (1980-2023) of data from neutron monitors (NMs) and muon detectors (MDs). The analysis incorporates global NM stations and the Nagoya Multi-Directional Muon Telescope to evaluate the influence of key heliospheric parameters: interplanetary magnetic field (IMF) strength, heliospheric current sheet tilt angle (TA), and solar wind (SW) speed. Results reveal pronounced rigidity-dependent modulation patterns. Lower-rigidity NMs exhibit stronger sensitivity to heliospheric conditions, driven largely by IMF and TA, consistent with diffusion- and drift-dominated transport. In contrast, higher-rigidity MDs show reduced modulation amplitudes, with IMF remaining the dominant influence and SW gaining relative importance as drift effects diminish. These findings provide new insight into the energy-dependent roles of heliospheric drivers in CR modulation and offer a robust framework for advancing space weather prediction and heliospheric transport modeling.

DOI： 10.3847/1538-4357/adfdd3

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Measurement of neutron production in atmospheric neutrino interactions at Super-Kamiokande Reviewed International coauthorship Open Access

Han, S; Abe, K; Abe, S; Asaoka, Y; Bronner, C; Harada, M; Hayato, Y; Hiraide, K; Hosokawa, K; Ieki, K; Ikeda, M; Kameda, J; Kanemura, Y; Kaneshima, R; Kashiwagi, Y; Kataoka, Y; Miki, S; Mine, S; Miura, M; Moriyama, S; Nakahata, M; Nakayama, S; Noguchi, Y; Pronost, G; Sato, K; Okamoto, K; Sekiya, H; Shiba, H; Shimizu, K; Shinoda, R; Shiozawa, M; Sonoda, Y; Suzuki, Y; Takeda, A; Takemoto, Y; Takenaka, A; Tanaka, H; Yano, T; Kajita, T; Okumura, K; Nishijima, R; Tashiro, T; Tomiya, T; Wang, X; Yoshida, S; Fernandez, P; Labarga, L; Ospina, N; Samudio, D; Zaldivar, B; Pointon, BW; Yanagisawa, C; Kearns, E; Raaf, JL; Wan, L; Wester, T; Bian, J; Cortez, B; Griskevich, NJ; Smy, MB; Sobel, HW; Takhistov, V; Yankelevich, A; Hill, J; Jang, MC; Lee, SH; Moon, DH; Park, RG; Yang, BS; Bodur, B; Scholberg, K; Walter, CW; Beauchêne, A; Drapier, O; Giampaolo, A; Ershova, A; Mueller, TA; Santos, AD; Paganini, P; Quach, C; Rogly, R; Nakamura, T; Jang, JS; Machado, LN; Soler, FP; Learned, JG; Choi, K; Iovine, N; Cao, S; Anthony, LHV; Martin, D; Prouse, NW; Scott, M; Uchida, Y; Sztuc, AA; Berardi, V; Calabria, NF; Catanesi, MG; Radicioni, E; Langella, A; De Rosa, G; Collazuol, G; Feltre, M; Iacob, F; Mattiazzi, M; Ludovici, L; Gonin, M; Périsse, L; Quilain, B; Fujisawa, C; Horiuchi, S; Kawabata, A; Kobayashi, M; Liu, YM; Maekawa, Y; Nishimura, Y; Okazaki, R; Akutsu, R; Friend, M; Hasegawa, T; Ishida, T; Kobayashi, T; Jakkapu, M; Matsubara, T; Nakadaira, T; Nakamura, K; Oyama, Y; Yrey, AP; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Bhuiyan, N; Burton, GT; Di Lodovico, F; Gao, J; Goldsack, A; Katori, T; Migenda, J; Ramsden, RM; Xie, Z; Zsoldos, S; Sone, T; Suzuki, AT; Takagi, Y; Takeuchi, Y; Wada, S; Zhong, H; Feng, J; Feng, L; Hikida, J; Hu, JR; Hu, Z; Kawaue, M; Kikawa, T; Mori, M; Nakaya, T; Ngoc, TV; Wendell, RA; Yasutome, K; Jenkins, SJ; McCauley, N; Tarrant, A; Mehta, P; Fani, M; Wilking, MJ; Fukuda, Y; Itow, Y; Menjo, H; Yoshioka, Y; Ninomiya, K; Lagoda, J; Lakshmi, SM; Mandal, M; Mijakowski, P; Prabhu, YS; Zalipska, J; Jia, M; Jiang, J; Jung, CK; Shi, W; Hamaguchi, K; Hino, Y; Ishino, H; Koshio, Y; Nakanishi, F; Sakai, S; Tada, T; Tano, T; Ishizuka, T; Barr, G; Barrow, D; Cook, L; Samani, S; Wark, D; Holin, A; Nova, F; Jung, S; Yang, JY; Yoo, J; Fannon, JEP; Kneale, L; Malek, M; McElwee, JM; Peacock, T; Stowell, P; Thiesse, MD; Thompson, LF; Wilson, ST; Okazawa, H; Lakshmi, SM; Kim, SB; Kwon, E; Lee, MW; Seo, JW; Yu, I; Ichikawa, AK; Nakamura, KD; Tairafune, S; Nishijima, K; Eguchi, A; Goto, S; Kodama, S; Mizuno, Y; Muro, T; Nakagiri, K; Nakajima, Y; Shima, S; Taniuchi, N; Watanabe, E; Yokoyama, M; De Perio, P; Fujita, S; Jesus-Valls, C; Martens, K; Marti, L; Tsui, KM; Vagins, MR; Xia, J; Kuze, M; Izumiyama, S; Matsumoto, R; Terada, K; Asaka, R; Ishitsuka, M; Ito, H; Ommura, Y; Shigeta, N; Shinoki, M; Sugo, M; Wako, M; Yamauchi, K; Yoshida, T; Nakano, Y; Cormier, F; Gaur, R; Gousy-Leblanc, V; Hartz, M; Konaka, A; Li, X; Smithers, BR; Chen, S; Wu, Y; Xu, BD; Zhang, AQ; Zhang, B; Girgus, M; Govindaraj, P; Posiadala-Zezula, M; Boyd, SB; Edwards, R; Hadley, D; Nicholson, M; O'Flaherty, M; Richards, B; Ali, A; Jamieson, B; Amanai, S; Hamaguchi, D; Minamino, A; Sasaki, Y; Shibayama, R; Shimamura, R; Suzuki, S

PHYSICAL REVIEW D Vol. 112 ( 1 ) page： 1 - 24 2025.7

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Language：English Publishing type：Research paper (scientific journal) Publisher：Physical Review D

We present measurements of total neutron production from atmospheric neutrino interactions in water, analyzed as a function of electron-equivalent visible energy over a range of 30 MeV to 10 GeV. These results are based on 4,270 days of data collected by Super-Kamiokande, including 564 days with 0.011 wt% gadolinium added to enhance neutron detection. Neutron signal selection is based on a neural network trained on simulation, with its performance validated using an Am/Be neutron point source. The measurements are compared to predictions from neutrino event generators combined with various hadron-nucleus interaction models, which include an intranuclear cascade model and a nuclear deexcitation model. We observe significant variations in the predictions depending on the choice of hadron-nucleus interaction model. We discuss key factors that contribute to describing our data, such as in-medium effects in the intranuclear cascade and the accuracy of statistical evaporation modeling.

DOI： 10.1103/4d71-d69k

Open Access

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Ground-based Observations of Temporal Variation of the Cosmic-Ray Spectrum during Forbush Decreases Reviewed International coauthorship Open Access

Mitthumsiri, W; Ruffolo, D; Munakata, K; Kozai, M; Hayashi, Y; Kato, C; Muangha, P; Sáiz, A; Evenson, P; Mangeard, PS; Clem, J; Seunarine, S; Nuntiyakul, W; Miyashita, N; Kataoka, R; Kadokura, A; Miyake, S; Iwai, K; Menjo, H; Echer, E; Dal Lago, A; Rockenbach, M; Schuch, NJ; Bageston, JV; Braga, CR; Al Jassar, HK; Sharma, MM; Burahmah, N; Zaman, F; Duldig, ML; Sabbah, I; Kuwabara, T

ASTROPHYSICAL JOURNAL LETTERS Vol. 986 ( 1 ) 2025.6

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Language：English Publishing type：Research paper (scientific journal) Publisher：Astrophysical Journal Letters

Observations of temporary Forbush decreases (FDs) in the Galactic cosmic-ray (GCR) flux due to the passage of solar storms are useful for space-weather studies and alerts. Here, we introduce techniques that use global networks of ground-based neutron monitors and muon detectors to measure variations of GCR rigidity spectra in space during FDs by (1) fitting count rate decreases for power-law rigidity spectra in space with anisotropy up to second order and (2) using the “leader fraction” derived from a single neutron monitor. We demonstrate that both provide consistent results for hourly spectral index variations for five major FDs, and they agree with daily space-based data when available from the Alpha Magnetic Spectrometer. We have also made the neutron monitor leader fraction publicly available in real time. This work verifies that ground-based observations can be used to precisely monitor GCR spectral variation over a wide range of rigidities during space-weather events, with results in real time or from short-term postanalysis.

DOI： 10.3847/2041-8213/add7d1

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Reconstruction of multiple calorimetric clusters in the LHCf experiment with machine learning techniques

Piparo G., Adriani O., Berti E., Betti P., Bonechi L., Bongi M., D'Alessandro R., Detti S., Gensini E., Haguenauer M., Isseverc C., Itow Y., Kasahara K., Kinoshita K., Kobayashi H., Leitgeb C., Matsubara Y., Menjo H., Muraki Y., Papini P., Ricciarini S., Sako T., Sakuma M., Sakurai N., Scaringella M., Shimizu Y., Tamura T., Tiberio A., Torii S., Tricomi A., Turner W.C., Yoshida K.

Proceedings of Science Vol. 476 2025.4

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Publisher：Proceedings of Science

One of the major challenges in the Large Hadron Collider forward (LHCf) experiment is the accurate reconstruction of calorimetric clusters when multiple particles hit the same detector tower simultaneously. Traditional reconstruction methods struggle with overlapping signals, especially in events involving more than two particles or a combination of photons and neutrons. This paper presents the development of machine learning (ML) techniques to improve the reconstruction efficiency of such complex events. We discuss the motivations for integrating ML into the LHCf reconstruction pipeline, outline the ML approach and dataset preparation, and compare the performance of ML models with standard methods. The results demonstrate a significant improvement in reconstructing multi-hit events, which is essential for analyses involving π0, η, K<inf>s</inf>0 mesons, and Λ0 baryon. Finally, we explore future prospects for ML applications in the LHCf experiment.

Scopus
First Joint Oscillation Analysis of Super-Kamiokande Atmospheric and T2K Accelerator Neutrino Data Reviewed International coauthorship International journal Open Access

Abe, K; Abe, S; Bronner, C; Hayato, Y; Hiraide, K; Hosokawa, K; Ieki, K; Ikeda, M; Kameda, J; Kanemura, Y; Kaneshima, R; Kashiwagi, Y; Kataoka, Y; Miki, S; Mine, S; Miura, M; Moriyama, S; Nakahata, M; Nakano, Y; Nakayama, S; Noguchi, Y; Sato, K; Sekiya, H; Shiba, H; Shimizu, K; Shiozawa, M; Sonoda, Y; Suzuki, Y; Takeda, A; Takemoto, Y; Tanaka, H; Yano, T; Han, S; Kajita, T; Okumura, K; Tashiro, T; Tomiya, T; Wang, X; Yoshida, S; Fernandez, P; Labarga, L; Ospina, N; Zaldivar, B; Pointon, BW; Kearns, E; Mirabito, J; Raaf, JL; Wan, L; Wester, T; Bian, J; Griskevich, NJ; Smy, MB; Sobel, HW; Takhistov, V; Yankelevich, A; Hill, J; Jang, MC; Lee, SH; Moon, DH; Park, RG; Bodur, B; Scholberg, K; Walter, CW; Beauchêne, A; Drapier, O; Giampaolo, A; Mueller, TA; Santos, AD; Paganini, P; Quilain, B; Rogly, R; Nakamura, T; Jang, JS; Machado, LN; Learned, JG; Choi, K; Iovine, N; Cao, S; Anthony, LHV; Martin, D; Prouse, NW; Scott, M; Uchida, Y; Berardi, V; Calabria, NF; Catanesi, MG; Radicioni, E; Langella, A; De Rosa, G; Collazuol, G; Feltre, M; Iacob, F; Mattiazzi, M; Ludovici, L; Gonin, M; Périssé, L; Pronost, G; Fujisawa, C; Horiuchi, S; Kobayashi, M; Liu, YM; Maekawa, Y; Nishimura, Y; Okazaki, R; Akutsu, R; Friend, M; Hasegawa, T; Ishida, T; Kobayashi, T; Jakkapu, M; Matsubara, T; Nakadaira, T; Nakamura, K; Oyama, Y; Yrey, AP; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Bhuiyan, N; Burton, GT; Di Lodovico, F; Gao, J; Goldsack, A; Katori, T; Migenda, J; Ramsden, RM; Xie, Z; Zsoldos, S; Suzuki, AT; Takagi, Y; Takeuchi, Y; Zhong, H; Feng, J; Feng, L; Hu, JR; Hu, Z; Kawaue, M; Kikawa, T; Mori, M; Nakaya, T; Wendell, RA; Yasutome, K; Jenkins, SJ; McCauley, N; Mehta, P; Tarrant, A; Wilking, MJ; Fukuda, Y; Itow, Y; Menjo, H; Ninomiya, K; Yoshioka, Y; Lagoda, J; Mandal, M; Mijakowski, P; Prabhu, YS; Zalipska, J; Jia, M; Jiang, J; Shi, W; Yanagisawa, C; Harada, M; Hino, Y; Ishino, H; Koshio, Y; Nakanishi, F; Sakai, S; Tada, T; Tano, T; Ishizuka, T; Barr, G; Barrow, D; Cook, L; Samani, S; Wark, D; Holin, A; Nova, F; Jung, S; Yang, BS; Yang, JY; Yoo, J; Fannon, JEP; Kneale, L; Malek, M; McElwee, JM; Thiesse, MD; Thompson, LF; Wilson, ST; Okazawa, H; Lakshmi, SM; Kim, SB; Kwon, E; Seo, JW; Yu, I; Ichikawa, AK; Nakamura, KD; Tairafune, S; Nishijima, K; Eguchi, A; Nakagiri, K; Nakajima, Y; Shima, S; Taniuchi, N; Watanabe, E; Yokoyama, M; de Perio, P; Fujita, S; Jesús-Valls, C; Martens, K; Tsui, KM; Vagins, MR; Xia, J; Izumiyama, S; Kuze, M; Matsumoto, R; Terada, K; Asaka, R; Ishitsuka, M; Ito, H; Ommura, Y; Shigeta, N; Shinoki, M; Yamauchi, K; Yoshida, T; Gaur, R; Gousy-Leblanc, V; Hartz, M; Konaka, A; Li, X; Chen, S; Xu, BD; Wu, Y; Zhang, AQ; Zhang, B; Posiadala-Zezula, M; Boyd, SB; Edwards, R; Hadley, D; Nicholson, M; O'Flaherty, M; Richards, B; Ali, A; Jamieson, B; Amanai, S; Marti, L; Minamino, A; Shibayama, R; Shimamura, R; Suzuki, S; Akhlaq, N; Akutsu, R; Alarakia-Charles, H; Ali, A; Hakim, YIA; Monsalve, SA; Andreopoulos, C; Anthony, L; Antonova, M; Aoki, S; Apte, KA; Arai, T; Arihara, T; Arimoto, S; Asada, Y; Ashida, Y; Atkin, ET; Babu, N; Barbi, M; Barker, GJ; Barr, G; Barrow, D; Bates, P; Batkiewicz-Kwasniak, M; Berardi, V; Berns, L; Bhadra, S; Blanchet, A; Blondel, A; Bolognesi, S; Bordoni, S; Boyd, SB; Bravar, A; Bronner, C; Bubak, A; Avanzini, MB; Caballero, JA; Calabria, NF; Cao, S; Carabadjac, D; Carter, AJ; Cartwright, SL; Casado, MP; Cervera, A; Chakrani, J; Chalumeau, A; Cherdack, D; Chong, PS; Chvirova, A; Cicerchia, M; Coleman, J; Collazuol, G; Cook, L; Cormier, F; Cudd, A; D'ago, D; Dalmazzone, C; Daret, T; Dasgupta, P; Davis, C; Davydov, YI; De Roeck, A; De Rosa, G; Dealtry, T; Delogu, CC; Densham, C; Dergacheva, A; Dharmapal, R; Di Lodovico, F; Lopez, GD; Dolan, S; Douqa, D; Doyle, TA; Drapier, O; Duffy, KE; Dumarchez, J; Dunne, P; Dygnarowicz, K; Elias, J; Emery-Schrenk, S; Erofeev, G; Ershova, A; Eurin, G; Fedorova, D; Fedotov, S; Feltre, M; Feng, L; Ferlewicz, D; Finch, AJ; Aguirre, GAF; Fiorillo, G; Fitton, MD; Patiño, JMF; Fujii, Y; Fukuda, Y; Furui, Y; Giannessi, L; Giganti, C; Glagolev, V; Gonin, M; Rosa, JG; Goodman, EAG; Gorin, A; Gorshanov, K; Grassi, M; Guigue, M; Hadley, DR; Haigh, JT; Han, S; Harris, DA; Hassani, S; Hastings, NC; Hayato, Y; Heitkamp, I; Henaff, D; Hino, Y; Hogan, M; Holeczek, J; Holin, A; Holvey, T; Van, NTH; Honjo, T; Hosokawa, K; Hu, J; Ichikawa, AK; Ieki, K; Ikeda, M; Ishitsuka, M; Izmaylov, A; Jakkapu, M; Jamieson, B; Jenkins, SJ; Jia, M; Jiang, JJ; Ji, JY; Jonsson, P; Joshi, S; Jung, CK; Kabirnezhad, M; Kaboth, AC; Kajita, T; Kakuno, H; Kameda, J; Karpova, S; Kasetti, SP; Kasturi, VS; Kataoka, Y; Katori, T; Kawamura, Y; Kawaue, M; Kearns, E; Khabibullin, M; Khotjantsev, A; Kikawa, T; King, S; Kiseeva, V; Kisiel, J; Kneale, L; Kobayashi, H; Kobayashi, T; Koch, L; Kodama, S; Kolupanova, M; Konaka, A; Kormos, LL; Koto, T; Kowalik, K; Kudenko, Y; Kudo, Y; Kuribayashi, S; Kurjata, R; Kurochka, V; Kutter, T; Kuze, M; La Commara, M; Labarga, L; Lachat, M; Lachner, K; Lagoda, J; Lakshmi, SM; James, ML; Langella, A; Laporte, JF; Last, D; Latham, N; Laveder, M; Lavitola, L; Lawe, M; Lee, Y; Silverio, DL; Levorato, S; Lewis, S; Lin, C; Litchfield, RP; Liu, SL; Li, W; Longhin, A; Long, KR; Moreno, AL; Ludovici, L; Lu, X; Lux, T; Machado, LN; Magaletti, L; Mahn, K; Mahtani, KK; Mandal, M; Manly, S; Marino, AD; Marti-Magro, L; Martin, DGR; Martini, M; Martin, JF; Maruyama, T; Matsubara, T; Matsumoto, R; Matveev, V; Mauger, C; Mavrokoridis, K; Mazzucato, E; McCauley, N; McFarland, KS; McGrew, C; McKean, J; Mefodiev, A; Megias, GD; Mehta, P; Mellet, L; Metelko, C; Mezzetto, M; Miki, S; Miller, E; Minamino, A; Mineev, O; Miura, M; Bueno, LM; Moriyama, S; Moriyama, S; Morrison, P; Mueller, TA; Munford, D; Muñoz, A; Munteanu, L; Nagai, K; Nagai, Y; Nakagiri, K; Nakahata, M; Nakamura, A; Nakamura, KD; Nakano, Y; Nakayama, S; Nakaya, T; Nakayoshi, K; Naseby, CER; Ngoc, TV; Nguyen, DT; Nguyen, VQ; Niewczas, K; Nishimori, S; Nishimura, Y; Noguchi, Y; Nosek, T; Nova, F; Novella, P; Nugent, JC; O'Keeffe, HM; O'Sullivan, L; Odagawa, T; Okazaki, R; Okinaga, W; Okumura, K; Okusawa, T; Onda, N; Ospina, N; Osu, L; Palladino, V; Paolone, V; Pari, M; Parlone, J; Pasternak, J; Payne, D; Penn, GC; Pershey, D; Pfaff, M; Pickering, L; Pintaudi, G; Pistillo, C; Popov, B; Porwit, K; Posiadala-Zezula, M; Prabhu, YS; Prasad, H; Pupilli, F; Quilain, B; Quyen, PT; Radermacher, T; Radicioni, E; Radics, B; Ramirez, MA; Ratoff, PN; Reh, M; Riccio, C; Rondio, E; Roth, S; Roy, N; Rubbia, A; Russo, L; Rychter, A; Saenz, W; Sánchez, F; Sato, Y; Schefke, T; Schloesser, CM; Scholberg, K; Scott, M; Seiya, Y; Sekiya, H; Sgalaberna, D; Shaikhiev, A; Shiozawa, M; Shiraishi, Y; Shvartsman, A; Skrobova, N; Skwarczynski, K; Smyczek, D; Smy, M; Sobczyk, JT; Sobel, H; Soler, FJP; Speers, AJ; Spina, R; Stroke, Y; Suslov, IA; Suvorov, S; Suzuki, A; Suzuki, SY; Suzuki, Y; Tada, M; Tairafune, S; Takeda, A; Takeuchi, Y; Takifuji, K; Tanaka, HK; Tanigawa, H; Teklu, A; Tereshchenko, VV; Thamm, N; Thompson, LF; Toki, W; Touramanis, C; Tsukamoto, T; Tzanov, M; Uchida, Y; Vagins, M; Vargas, D; Varghese, M; Vasseur, G; Villa, E; Vinning, WGS; Virginet, U; Vladisavljevic, T; Wachala, T; Wakabayashi, D; Wallace, HT; Walsh, JG; Wang, Y; Wan, L; Wark, D; Wascko, MO; Weber, A; Wendell, R; Wilking, MJ; Wilkinson, C; Wilson, JR; Wood, K; Wret, C; Xia, J; Xu, YH; Yamamoto, K; Yamamoto, T; Yanagisawa, C; Yang, G; Yano, T; Yasutome, K; Yershov, N; Yevarouskaya, U; Yoshimoto, Y; Yoshimura, N; Yu, M; Zaki, R; Zalewska, A; Zalipska, J; Zaremba, K; Zarnecki, G; Zhang, J; Zhao, XY; Zhong, H; Zhu, T; Ziembicki, M; Zimmerman, ED; Zito, M

PHYSICAL REVIEW LETTERS Vol. 134 ( 1 ) page： 011801 2025.1

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Language：English Publishing type：Research paper (scientific journal) Publisher：Physical Review Letters

The Super-Kamiokande and T2K Collaborations present a joint measurement of neutrino oscillation parameters from their atmospheric and beam neutrino data. It uses a common interaction model for events overlapping in neutrino energy and correlated detector systematic uncertainties between the two datasets, which are found to be compatible. Using 3244.4 days of atmospheric data and a beam exposure of 19.7(16.3)×1020 protons on target in (anti)neutrino mode, the analysis finds a 1.9σ exclusion of CP conservation (defined as JCP=0) and a 1.2σ exclusion of the inverted mass ordering.

DOI： 10.1103/PhysRevLett.134.011801

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Search for proton decay via p → e+η and p → μ+η with a 0.37 Mton-year exposure of Super-Kamiokande Reviewed International coauthorship International journal Open Access

Taniuchi, N; Abe, K; Abe, S; Asaoka, Y; Bronner, C; Harada, M; Hayato, Y; Hiraide, K; Hosokawa, K; Ieki, K; Ikeda, M; Kameda, J; Kanemura, Y; Kaneshima, R; Kashiwagi, Y; Kataoka, Y; Miki, S; Mine, S; Miura, M; Moriyama, S; Nakahata, M; Nakayama, S; Noguchi, Y; Pronost, G; Okamoto, K; Sato, K; Sekiya, H; Shiba, H; Shimizu, K; Shiozawa, M; Sonoda, Y; Suzuki, Y; Takeda, A; Takemoto, Y; Takenaka, A; Tanaka, H; Watanabe, S; Yano, T; Kajita, T; Okumura, K; Tashiro, T; Tomiya, T; Wang, X; Yoshida, S; Megias, GD; Fernandez, P; Labarga, L; Ospina, N; Zaldivar, B; Pointon, BW; Kearns, E; Mirabito, J; Raaf, JL; Wan, L; Wester, T; Bian, J; Griskevich, NJ; Kropp, WR; Locke, S; Smy, MB; Sobel, HW; Takhistov, V; Yankelevich, A; Hill, J; Jang, MC; Kim, JY; Lee, SH; Lim, IT; Moon, DH; Park, RG; Yang, BS; Bodur, B; Scholberg, K; Walter, CW; Beauchêne, A; Bernard, L; Coffani, A; Drapier, O; El Hedri, S; Giampaolo, A; Mueller, TA; Santos, AD; Paganini, P; Rogly, R; Nakamura, T; Jang, JS; Machado, LN; Learned, JG; Choi, K; Iovine, N; Cao, S; Anthony, LHV; Martin, D; Prouse, NW; Scott, M; Sztuc, AA; Uchida, Y; Berardi, V; Calabria, NF; Catanesi, MG; Radicioni, E; Langella, A; De Rosa, G; Collazuol, G; Feltre, M; Iacob, F; Lamoureux, M; Mattiazzi, M; Ludovici, L; Gonin, M; Périssé, L; Quilain, B; Fujisawa, C; Horiuchi, S; Kobayashi, M; Liu, YM; Maekawa, Y; Nishimura, Y; Okazaki, R; Akutsu, R; Friend, M; Hasegawa, T; Ishida, T; Kobayashi, T; Jakkapu, M; Matsubara, T; Nakadaira, T; Nakamura, K; Oyama, Y; Yrey, AP; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Bhuiyan, N; Boschi, T; Burton, GT; Di Lodovico, F; Gao, J; Goldsack, A; Katori, T; Migenda, J; Ramsden, RM; Taani, M; Xie, Z; Zsoldos, S; Kotsar, Y; Ozaki, H; Suzuki, AT; Takagi, Y; Takeuchi, Y; Yamamoto, S; Zhong, H; Feng, J; Feng, L; Han, S; Hu, JR; Hu, Z; Kawaue, M; Kikawa, T; Mori, M; Nakaya, T; Wendell, RA; Yasutome, K; Jenkins, SJ; McCauley, N; Mehta, P; Tarrant, A; Wilking, MJ; Fukuda, Y; Itow, Y; Menjo, H; Ninomiya, K; Yoshioka, Y; Lagoda, J; Mandal, M; Mijakowski, P; Prabhu, YS; Zalipska, J; Jia, M; Jiang, J; Jung, CK; Shi, W; Yanagisawa, C; Hino, Y; Ishino, H; Ito, S; Kitagawa, H; Koshio, Y; Ma, W; Nakanishi, F; Sakai, S; Tada, T; Tano, T; Ishizuka, T; Barr, G; Barrow, D; Cook, L; Samani, S; Wark, D; Holin, A; Nova, F; Jung, S; Yang, JY; Yoo, J; Fannon, JEP; Kneale, L; Malek, M; McElwee, JM; Stone, O; Stowell, P; Thiesse, MD; Thompson, LF; Wilson, ST; Okazawa, H; Lakshmi, SM; Kim, SB; Kwon, E; Lee, MW; Seo, JW; Yu, I; Ichikawa, AK; Nakamura, KD; Tairafune, S; Nishijima, K; Koshiba, M; Eguchi, A; Goto, S; Iwamoto, K; Mizuno, Y; Muro, T; Nakagiri, K; Nakajima, Y; Shima, S; Watanabe, E; Yokoyama, M; de Perio, P; Fujita, S; Jesús-Valls, C; Martens, K; Marti, L; Tsui, KM; Vagins, MR; Xia, J; Izumiyama, S; Kuze, M; Matsumoto, R; Terada, K; Asaka, R; Inomoto, M; Ishitsuka, M; Ito, H; Kinoshita, T; Ommura, Y; Shigeta, N; Shinoki, M; Suganuma, T; Yamauchi, K; Yoshida, T; Nakano, Y; Martin, JF; Tanaka, HA; Towstego, T; Gaur, R; Gousy-Leblanc, V; Hartz, M; Konaka, A; Li, X; Chen, S; Wu, Y; Xu, BD; Zhang, AQ; Zhang, B; Posiadala-Zezula, M; Boyd, SB; Edwards, R; Hadley, D; Nicholson, M; O'Flaherty, M; Richards, B; Ali, A; Jamieson, B; Amanai, S; Minamino, A; Pintaudi, G; Sano, S; Sasaki, R; Shibayama, R; Shimamura, R; Suzuki, S; Wada, K

PHYSICAL REVIEW D Vol. 110 ( 11 ) 2024.12

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Language：English Publishing type：Research paper (scientific journal) Publisher：Physical Review D

A search for proton decay into e+/μ+ and a η meson has been performed using data from a 0.373 Mton·year exposure (6050.3 live days) of Super-Kamiokande. Compared to previous searches this work introduces an improved model of the intranuclear η interaction cross section, resulting in a factor of 2 reduction in uncertainties from this source and ∼10% increase in signal efficiency. No significant data excess was found above the expected number of atmospheric neutrino background events resulting in no indication of proton decay into either mode. Lower limits on the proton partial lifetime of 1.4×1034 years for p→e+η and 7.3×1033 years for p→μ+η at the 90% CL were set. These limits are around 1.5 times longer than our previous study and are the most stringent to date.

DOI： 10.1103/PhysRevD.110.112011

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Measurements of the charge ratio and polarization of cosmic-ray muons with the Super-Kamiokande detector Reviewed International coauthorship International journal Open Access

Kitagawa, H; Tada, T; Abe, K; Bronner, C; Hayato, Y; Hiraide, K; Hosokawa, K; Ieki, K; Ikeda, M; Kameda, J; Kanemura, Y; Kaneshima, R; Kashiwagi, Y; Kataoka, Y; Miki, S; Mine, S; Miura, M; Moriyama, S; Nakahata, M; Nakano, Y; Nakayama, S; Noguchi, Y; Okamoto, K; Sato, K; Sekiya, H; Shiba, H; Shimizu, K; Shiozawa, M; Sonoda, Y; Suzuki, Y; Takeda, A; Takemoto, Y; Takenaka, A; Tanaka, H; Watanabe, S; Yano, T; Han, S; Kajita, T; Okumura, K; Tashiro, T; Tomiya, T; Wang, X; Yoshida, S; Megias, GD; Fernandez, P; Labarga, L; Ospina, N; Zaldivar, B; Kearns, E; Raaf, JL; Wan, L; Wester, T; Pointon, BW; Bian, J; Griskevich, NJ; Locke, S; Smy, MB; Sobel, HW; Takhistov, V; Yankelevich, A; Hill, J; Jang, MC; Lee, SH; Moon, DH; Park, RG; Bodur, B; Scholberg, K; Walter, CW; Beauchêne, A; Drapier, O; Giampaolo, A; Mueller, TA; Paganini, P; Quilain, B; Rogly, R; Santos, AD; Nakamura, T; Jang, JS; Machado, LN; Learned, JG; Choi, K; Iovine, N; Cao, S; Anthony, LHV; Marin, D; Prouse, NW; Scott, M; Sztuc, AA; Uchida, Y; Berardi, V; Calabria, NF; Catanesi, MG; Radicioni, E; Langella, A; De Rosa, G; Collazuol, G; Iacob, F; Lamoureux, M; Mattiazzi, M; Ludovici, L; Gonin, M; Perisse, L; Pronost, G; Fujisawa, C; Maekawa, Y; Nishimura, Y; Okazaki, R; Akutsu, R; Friend, M; Hasegawa, T; Ishida, T; Jakkapu, M; Kobayashi, T; Matsubara, T; Nakadaira, T; Nakamura, K; Oyama, Y; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Bhuiyan, N; Burton, GT; Gao, J; Goldsack, A; Katori, T; Lodovico, FD; Migenda, J; Ramsden, RM; Xie, Z; Zsoldos, S; Kotsar, Y; Ozaki, H; Suzuki, AT; Takagi, Y; Takeuchi, Y; Zhong, H; Feng, J; Feng, L; Hu, JR; Hu, Z; Kawaue, M; Kikawa, T; Mori, M; Nakaya, T; Wendell, RA; Yasutome, K; Jenkins, SJ; McCauley, N; Mehta, P; Tarrant, A; Wilking, MJ; Fukuda, Y; Itow, Y; Menjo, H; Ninomiya, K; Yoshioka, Y; Lagoda, J; Mandal, M; Mijakowski, P; Prabhu, YS; Zalipska, J; Jia, M; Jiang, J; Jung, CK; Shi, W; Yanagisawa, C; Harada, M; Hino, Y; Ishino, H; Koshio, Y; Nakanishi, F; Sakai, S; Tano, T; Ishizuka, T; Barr, G; Barrow, D; Cook, L; Samani, S; Wark, D; Holin, AM; Nova, F; Jung, S; Yang, BS; Yang, JY; Yoo, J; Fannon, JEP; Kneale, L; Malek, M; McElwee, JM; Thiesse, MD; Thompson, LF; Wilson, ST; Okazawa, H; Lakshmi, SM; Kim, SB; Kwon, E; Seo, JW; Yu, I; Ichikawa, AK; Nakamura, KD; Tairafune, S; Nishijima, K; Eguchi, A; Nakagiri, K; Nakajima, Y; Shima, S; Taniuchi, N; Watanabe, E; Yokoyama, M; Fujita, S; Jesus-Valls, C; Martens, K; Tsui, KM; de Perio, P; Vagins, MR; Xia, J; Izumiyama, S; Kuze, M; Matsumoto, R; Terada, K; Ishitsuka, M; Ito, H; Kinoshita, T; Ommura, Y; Shigeta, N; Shinoki, M; Suganuma, T; Yamauchi, K; Yoshida, T; Martin, JF; Tanaka, HA; Towstego, T; Gaur, R; Gousy-Leblanc, V; Hartz, M; Konaka, A; Li, X; Chen, S; Xu, BD; Zhang, B; Posiadala-Zezula, M; Boyd, SB; Edwards, R; Hadley, D; Nicholson, M; O'Flaherty, M; Richards, B; Ali, A; Jamieson, B; Amanai, S; Marti, L; Minamino, A; Pintaudi, G; Sano, S; Suzuki, S; Wada, K

PHYSICAL REVIEW D Vol. 110 ( 8 ) 2024.10

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Language：English Publishing type：Research paper (scientific journal) Publisher：Physical Review D

We present the results of the charge ratio (R) and polarization (P0μ) measurements using decay electron events collected between September 2008 and June 2022 with the Super-Kamiokande detector. Because of its underground location and long operation, we are able to perform high-precision measurements by accumulating cosmic-ray muons. We measured the muon charge ratio to be R=1.32±0.02(stat+syst) at EμcosθZenith=0.7-0.2+0.3 TeV, where Eμ is the muon energy and θZenith is the zenith angle of incoming cosmic-ray muons. This result is consistent with the Honda flux model while indicating a tension with the πK model of 1.9σ. We also measured the muon polarization at the production location to be P0μ=0.52±0.02 (stat+syst) at the muon momentum of 0.9-0.1+0.6 TeV/c at the surface of the mountain; this also suggests a tension with the Honda flux model of 1.5σ. This is the most precise measurement ever to experimentally determine the cosmic-ray muon polarization near 1 TeV/c. These measurement results are useful to improve atmospheric neutrino simulations.

DOI： 10.1103/PhysRevD.110.082008

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Development of a Data Overflow Protection System for Super-Kamiokande to Maximize Data from Nearby Supernovae Reviewed International coauthorship International journal

Mori, M; Abe, K; Hayato, Y; Hiraide, K; Hosokawa, K; Ieki, K; Ikeda, M; Kameda, J; Kanemura, Y; Kaneshima, R; Kashiwagi, Y; Kataoka, Y; Miki, S; Mine, S; Miura, M; Moriyama, S; Nakano, Y; Nakahata, M; Nakayama, S; Noguchi, Y; Okamoto, K; Sato, K; Sekiya, H; Shiba, H; Shimizu, K; Shiozawa, M; Sonoda, Y; Suzuki, Y; Takeda, A; Takemoto, Y; Takenaka, A; Tanaka, H; Watanabe, S; Yano, T; Han, S; Kajita, T; Okumura, K; Tashiro, T; Tomiya, T; Wang, X; Yoshida, S; Megias, GD; Fernandez, P; Labarga, L; Ospina, N; Zaldivar, B; Pointon, BW; Kearns, E; Raaf, JL; Wan, L; Wester, T; Bian, J; Griskevich, NJ; Locke, S; Smy, MB; Sobel, HW; Takhistov, ; Yankelevich, A; Hill, J; Jang, MC; Lee, SH; Moon, DH; Park, RG; Bodur, B; Scholberg, K; Walter, CW; Beauchêne, A; Drapier, O; Giampaolo, A; Mueller, TA; Santos, AD; Paganini, P; Quilain, B; Rogly, R; Ishizuka, T; Nakamura, T; Jang, JS; Learned, JG; Choi, K; Iovine, N; Cao, S; Anthony, LH; Martin, D; Scott, M; Sztuc, AA; Uchida, Y; Berardi, ; Catanesi, MG; Radicioni, E; Calabria, NF; Langella, A; Machado, LN; De Rosa, G; Collazuol, G; Iacob, F; Lamoureux, M; Mattiazzi, M; Ludovici, L; Gonin, M; Perisse, L; Pronost, G; Fujisawa, C; Maekawa, Y; Nishimura, Y; Okazaki, R; Akutsu, R; Friend, M; Hasegawa, T; Ishida, T; Kobayashi, T; Jakkapu, M; Matsubara, T; Nakadaira, T; Nakamura, K; Oyama, Y; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Bhuiyan, N; Burton, GT; Edwards, R; Di Lodovico, F; Gao, J; Goldsack, A; Katori, T; Migenda, J; Ramsden, RM; Xie, Z; Zsoldos, S; Kotsar, Y; Ozaki, H; Suzuki, AT; Takagi, Y; Takeuchi, Y; Zhong, H; Bronner, C; Feng, J; Hu, JR; Hu, Z; Kawaune, M; Kikawa, T; LiCheng, F; Nakaya, T; Wendell, RA; Yasutome, K; Jenkins, SJ; McCauley, N; Mehta, P; Tarant, A; Fukuda, Y; Itow, Y; Menjo, H; Ninomiya, K; Yoshioka, Y; Lagoda, J; Lakshmi, SM; Mandal, M; Mijakowski, P; Prabhu, YS; Zalipska, J; Jia, M; Jiang, J; Jung, CK; Shi, W; Wilking, MJ; Yanagisawa, C; Harada, M; Hino, Y; Ishino, H; Kitagawa, H; Koshio, Y; Nakanishi, F; Sakai, S; Tada, T; Tano, T; Barr, G; Barrow, D; Cook, L; Samani, S; Wark, D; Holin, A; Nova, F; Jung, S; Yang, BS; Yang, JY; Yoo, J; Fannon, JEP; Kneale, L; Malek, M; McElwee, JM; Thiesse, MD; Thompson, LF; Wilson, S; Okazawa, H; Kim, SB; Kwon, E; Seo, JW; Yu, ; Ichikawa, AK; Nakamura, KD; Tairafune, S; Nishijima, K; Eguchi, A; Nakagiri, K; Nakajima, Y; Shima, S; Taniuchi, N; Watanabe, E; Yokoyama, M; de Perio, P; Fujita, S; Martens, K; Tsui, KM; Vagins, MR; Valls, CJ; Xia, J; Kuze, M; Izumiyama, S; Ishitsuka, M; Ito, H; Kinoshita, T; Matsumoto, R; Ommura, Y; Shigeta, N; Shinoki, M; Suganuma, T; Yamauchi, K; Yoshida, T; Martin, JF; Tanaka, HA; Towstego, T; Gaur, R; Gousy-Leblanc, ; Hartz, M; Konaka, A; Li, X; Prouse, NW; Chen, S; Xu, BD; Zhang, B; Posiadala-Zezula, M; Boyd, SB; Hadley, D; Nicholson, M; O'Flaherty, M; Richards, B; Ali, A; Jamieson, B; Amanai, S; Marti, L; Minamino, A; Pintaudi, G; Sano, S; Suzuki, S; Wada, K

PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS Vol. 2024 ( 10 ) 2024.10

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Language：English Publishing type：Research paper (scientific journal) Publisher：Progress of Theoretical and Experimental Physics

Neutrinos from very nearby supernovae, such as Betelgeuse, are expected to generate more than ten million events over 10 s in Super-Kamokande (SK). At such large event rates, the buffers of the SK analog-to-digital conversion board (QBEE) will overflow, causing random loss of data that are critical for understanding the dynamics of the supernova explosion mechanism. In order to solve this problem, two new data-acquisition (DAQ) modules were developed to aid in the observation of very nearby supernovae. The first of these, the SN module, is designed to save only the number of hit photomultiplier tubes during a supernova burst and the second, the Veto module, prescales the high-rate neutrino events to prevent the QBEE from overflowing based on information from the SN module. In the event of a very nearby supernova, these modules allow SK to reconstruct the time evolution of the neutrino event rate from beginning to end using both QBEE and SN module data. This paper presents the development and testing of these modules together with an analysis of supernova-like data generated with a flashing laser diode. We demonstrate that the Veto module successfully prevents DAQ overflows for Betelgeuse-like supernovae as well as the long-term stability of the new modules. During normal running the Veto module is found to issue DAQ vetos a few times per month resulting in a total dead-time less than 1 ms, and does not influence ordinary operations. Additionally, using simulation data we find that supernovae closer than 800 pc will trigger the Veto module, resulting in a prescaling of the observed neutrino data.

DOI： 10.1093/ptep/ptae128

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Combined Pre-supernova Alert System with KamLAND and Super-Kamiokande Reviewed International coauthorship International journal Open Access

Abe, S; Eizuka, M; Futagi, S; Gando, A; Gando, Y; Goto, S; Hachiya, T; Hata, K; Ichimura, K; Ieki, S; Ikeda, H; Inoue, K; Ishidoshiro, K; Kamei, Y; Kawada, N; Kishimoto, Y; Koga, M; Kurasawa, M; Mitsui, T; Miyake, H; Morita, D; Nakahata, T; Nakajima, R; Nakamura, K; Nakamura, R; Nakane, J; Ozaki, H; Saito, K; Sakai, T; Shimizu, ; Shirai, J; Shiraishi, K; Shoji, R; Suzuki, A; Takeuchi, A; Tamae, K; Watanabe, H; Watanabe, K; Yoshida, S; Umehara, S; Fushimi, K; Kotera, K; Urano, Y; Berger, BE; Fujikawa, BK; Learned, JG; Maricic, J; Fu, Z; Smolsky, J; Winslow, LA; Efremenko, Y; Karwowski, HJ; Markoff, DM; Tornow, W; Dell'Oro, S; O'Donnell, T; Detwiler, JA; Enomoto, S; Decowski, MP; Weerman, KM; Grant, C; Song, H; Li, A; Axani, SN; Garcia, M; Abe, K; Bronner, C; Hayato, Y; Hiraide, K; Hosokawa, K; Ieki, K; Ikeda, M; Kameda, J; Kanemura, Y; Kaneshima, R; Kashiwagi, Y; Kataoka, Y; Miki, S; Mine, S; Miura, M; Moriyama, S; Nakahata, M; Nakano, Y; Nakayama, S; Noguchi, Y; Sato, K; Sekiya, H; Shiba, H; Shimizu, K; Shiozawa, M; Sonoda, Y; Suzuki, Y; Takeda, A; Takemoto, Y; Tanaka, H; Yano, T; Han, S; Kajita, T; Okumura, K; Tashiro, T; Tomiya, T; Wang, X; Fernandez, P; Labarga, L; Ospina, N; Zaldivar, B; Pointon, BW; Kearns, E; Raaf, JL; Wan, L; Wester, T; Bian, J; Griskevich, NJ; Smy, MB; Sobel, HW; Takhistov, ; Yankelevich, A; Hill, J; Jang, MC; Lee, SH; Moon, DH; Park, RG; Bodur, B; Scholberg, K; Walter, CW; Beauchêne, A; Drapier, O; Giampaolo, A; Mueller, TA; Santos, AD; Paganini, P; Quilain, B; Rogly, R; Nakamura, T; Jang, JS; Machado, LN; Choi, K; Iovine, N; Cao, S; Anthony, LH; Martin, D; Prouse, NW; Scott, M; Uchida, Y; Berardi, ; Calabria, NF; Catanesi, MG; Radicioni, E; Langella, A; De Rosa, G; Collazuol, G; Feltre, M; Iacob, F; Mattiazzi, M; Ludovici, L; Gonin, M; Périssé, L; Pronost, G; Fujisawa, C; Horiuchi, S; Kobayashi, M; Liu, YM; Maekawa, Y; Nishimura, Y; Okazaki, R; Akutsu, R; Friend, M; Hasegawa, T; Ishida, T; Kobayashi, T; Jakkapu, M; Matsubara, T; Nakadaira, T; Oyama, Y; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Yrey, AP; Bhuiyan, N; Burton, GT; Di Lodovico, F; Gao, J; Goldsack, A; Katori, T; Migenda, J; Ramsden, RM; Xie, Z; Zsoldos, S; Suzuki, AT; Takagi, Y; Takeuchi, Y; Zhong, H; Feng, J; Feng, L; Hu, JR; Hu, Z; Kawaue, M; Kikawa, T; Mori, M; Nakaya, T; Wendell, RA; Yasutome, K; Jenkins, SJ; McCauley, N; Mehta, P; Tarrant, A; Wilking, MJ; Fukuda, Y; Itow, Y; Menjo, H; Ninomiya, K; Yoshioka, Y; Lagoda, J; Mandal, M; Mijakowski, P; Prabhu, YS; Zalipska, J; Jia, M; Jiang, J; Shi, W; Yanagisawa, C; Harada, M; Hino, Y; Ishino, H; Koshio, Y; Nakanishi, F; Sakai, S; Tada, T; Tano, T; Ishizuka, T; Barr, G; Barrow, D; Cook, L; Samani, S; Wark, D; Holin, A; Nova, F; Jung, S; Yang, BS; Yang, JY; Yoo, J; Fannon, JEP; Kneale, L; Malek, M; McElwee, JM; Thiesse, MD; Thompson, LF; Wilson, ST; Okazawa, H; Lakshmi, SM; Kim, SB; Kwon, E; Seo, JW; Yu, ; Ichikawa, AK; Nakamura, KD; Tairafune, S; Nishijima, K; Eguchi, A; Nakagiri, K; Nakajima, Y; Shima, S; Taniuchi, N; Watanabe, E; Yokoyama, M; de Perio, P; Fujita, S; Jesús-Valls, C; Martens, K; Tsui, KM; Vagins, MR; Xia, J; Izumiyama, S; Kuze, M; Matsumoto, R; Terada, K; Asaka, R; Ishitsuka, M; Ito, H; Ommura, Y; Shigeta, N; Shinoki, M; Yamauchi, K; Yoshida, T; Gaur, R; Gousy-Leblanc, ; Hartz, M; Konaka, A; Li, X; Chen, S; Xu, BD; Zhang, AQ; Zhang, B; Posiadala-Zezula, M; Boyd, SB; Edwards, R; Hadley, D; Nicholson, M; O'Flaherty, M; Richards, B; Ali, A; Jamieson, B; Amanai, S; Marti, L; Minamino, A; Shibayama, R; Suzuki, S

ASTROPHYSICAL JOURNAL Vol. 973 ( 2 ) 2024.10

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Language：English Publishing type：Research paper (scientific journal) Publisher：Astrophysical Journal

Preceding a core-collapse supernova (CCSN), various processes produce an increasing amount of neutrinos of all flavors characterized by mounting energies from the interior of massive stars. Among them, the electron antineutrinos are potentially detectable by terrestrial neutrino experiments such as KamLAND and Super-Kamiokande (SK) via inverse beta decay interactions. Once these pre-supernova (pre-SN) neutrinos are observed, an early warning of the upcoming CCSN can be provided. In light of this, KamLAND and SK, both located in the Kamioka mine in Japan, have been monitoring pre-SN neutrinos since 2015 and 2021, respectively. Recently, we performed a joint study between KamLAND and SK on pre-SN neutrino detection. A pre-SN alert system combining the KamLAND detector and the SK detector was developed and put into operation, which can provide a supernova alert to the astrophysics community. Fully leveraging the complementary properties of these two detectors, the combined alert is expected to resolve a pre-SN neutrino signal from a 15 M <inf>⊙</inf> star within 510 pc of the Earth at a significance level corresponding to a false alarm rate of no more than 1 per century. For a Betelgeuse-like model with optimistic parameters, it can provide early warnings up to 12 hr in advance.

DOI： 10.3847/1538-4357/ad5fee

Open Access

Web of Science

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Development of a general purpose air shower simulation tool COSMOS X International journal Open Access

Sako T., Fujii T., Kasahara K., Menjo H., Sakaki N., Taketa A., Tameda Y.

Proceedings of Science Vol. 444 2024.9

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：Proceedings of Science

Extended COSMOS, COSMOS X, is a major upgrade of the air shower simulation tool COSMOS, which has been developed since 1970’s. To be compatible with the environment of the modern personal computers, COSMOS X can be compiled with gfortran and intel fortran helped by cmake. In addition to the earth’s atmosphere, particle tracking in the arbitrary spherical media with a common center is available with COSMOS X. This allows seamless simulations in air, water, ice, soil, concrete and also simulations in the atmosphere of stars and planets. For the design of new experiments and calculations of cosmic-ray interactions in the non-earth environments, COSMOS X opens wide possibilities. Basic functions and some interesting applications of COSMOS X are presented in the conference.

DOI： 10.22323/1.444.0294

Open Access

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Time-dependent and Time-independent Directional Search for High-Energy Astrophysical Neutrino Point Sources in Super-Kamiokande International coauthorship International journal Open Access

Wang X., Abe K., Bronner C., Hayato Y., Hiraide K., Hosokawa K., Ieki K., Ikeda M., Kameda J., Kanemura Y., Kaneshima R., Kashiwagi Y., Kataoka Y., Miki S., Mine S., Miura M., Moriyama S., Nakano Y., Nakahata M., Nakayama S., Noguchi Y., Sato K., Sekiya H., Shiba H., Shimizu K., Shiozawa M., Sonoda Y., Suzuki Y., Takeda A., Takemoto Y., Tanaka H., Yano T., Han S., Kajita T., Okumura K., Tashiro T., Tomiya T., Wang X., Yoshida S., Fernandez P., Labarga L., Ospina N., Zaldivar B., Pointon B.W., Kearns E., Raaf J.L., Wan L., Wester T., Bian J., Griskevich N.J., Locke S., Smy M.B., Sobel H.W., Takhistov V., Yankelevich A., Hill J., Lee S.H., Moon D.H., Park R.G., Bodur B., Scholberg K., Walter C.W., Beauchêne A., Drapier O., Giampaolo A., Mueller T.A., Santos A.D., Paganini P., Quilain B., Nakamura T., Jang J.S., Machado L.N., Learned J.G., Choi K., Iovine N., Cao S., Anthony L.H.V., Martin D., Prouse N.W., Scott M., Sztuc A.A., Uchida Y., Berardi V., Catanesi M.G., Radicioni E., Calabria N.F., Langella A., De Rosa G., Collazuol G., Iacob F., Mattiazzi M., Ludovici L., Gonin M., Pronost G., Fujisawa C., Maekawa Y., Nishimura Y., Okazaki R., Akutsu R., Friend M.

Proceedings of Science Vol. 444 2024.9

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：Proceedings of Science

This contribution reports the results of the searches for high-energy astrophysical neutrino point sources in the energy range above GeV using Super-Kamiokande data. The searches include time-integrated and time-dependent full sky searches for both ν<inf>μ</inf> and ν<inf>e</inf> sources and coincidence check with candidates including TXS 0506+056 and NGC 1068. The searches use unbinned maximum likelihood method, and test statistics is calculated to find signal excess over atmospheric neutrino background. The time-integrated search method is updated from a previous search by adding the neutrino energy distribution in the likelihood to consider different power-law emission spectra with varying spectral indices. This is the first time to perform the time-dependent search, which has a better performance in searching for neutrino emission in a short time period, in Super-Kamiokande. Upper limits on neutrino flux or fluence are set for all searches.

DOI： 10.22323/1.444.1079

Open Access

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The LHCf experiment at the Large Hadron Collider: status and prospects International coauthorship International journal Open Access

Tiberio A., Adriani O., Berti E., Betti P., Bonechi L., Bongi M., D’Alessandro R., Detti S., Haguenauer M., Itow Y., Kasahara K., Kitagami Y., Kondo M., Matsubara Y., Menjo H., Muraki Y., Ohashi K., Papini P., Piparo G., Ricciarini S., Sako T., Sakurai N., Scaringella M., Shimizu Y., Tamura T., Torii S., Tricomi A., Turner W.C., Yoshida K.

Proceedings of Science Vol. 444 2024.9

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：Proceedings of Science

The LHC-forward experiment (LHCf), located at the Large Hadron Collider (LHC), is designed to measure the production cross section of neutral particles in the pseudorapidity region above 8.4, up to zero-degree. The measurement of the very-forward particle production rates at the highest energy available at an accelerator will provides fundamental informations for the tuning of the phenomenological hadronic interaction models used in the simulation of air-showers induced by ultra-high-energy cosmic rays in the Earth atmosphere. The experiment consists of two small independent detectors placed 140 metres away from the ATLAS interaction point (IP1), on opposite sides. Each detector is made of two sampling and position sensitive calorimeters. This contribution will firstly highlight the Run II physics results of LHCf in proton-proton collisions at 13 TeV: the photon and neutron production spectra will be presented and compared with the predictions of several hadronic interaction models commonly used in air-shower simulations. Furthermore, the advantages of the ATLAS-LHCf combined analysis will be discussed and the energy spectrum of very-forward photons produced in diffractive collisions (tagged by ATLAS central detectors) will be shown together with models predictions. Later, a report of the successful LHCf data taking during its dedicated run with proton-proton collisions at 13.6 TeV performed on September 2022 will be presented. Finally, the physics motivation of the foreseen operation with proton-oxygen collisions at the LHC will be illustrated.

DOI： 10.22323/1.444.0444

Open Access

Scopus
Study of the neutrino-oxygen neutral-current quasielastic cross section using atmospheric neutrinos in the SK-Gd experiment Reviewed International coauthorship International journal Open Access

Sakai S., Abe K., Bronner C., Hayato Y., Hiraide K., Hosokawa K., Ieki K., Ikeda M., Kameda J., Kanemura Y., Kaneshima R., Kashiwagi Y., Kataoka Y., Miki S., Mine S., Miura M., Moriyama S., Nakano Y., Nakahata M., Nakayama S., Noguchi Y., Sato K., Sekiya H., Shiba H., Shimizu K., Shiozawa M., Sonoda Y., Suzuki Y., Takeda A., Takemoto Y., Tanaka H., Yano T., Han S., Kajita T., Okumura K., Tashiro T., Tomiya T., Wang X., Yoshida S., Fernandez P., Labarga L., Ospina N., Zaldivar B., Pointon B.W., Kearns E., Raaf J.L., Wan L., Wester T., Bian J., Griskevich N.J., Locke S., Smy M.B., Sobel H.W., Takhistov V., Yankelevich A., Hill J., Lee S.H., Moon D.H., Park R.G., Bodur B., Scholberg K., Walter C.W., Beauchêne A., Drapier O., Giampaolo A., Mueller T.A., Santos A.D., Paganini P., Quilain B., Nakamura T., Jang J.S., Machado L.N., Learned J.G., Choi K., Iovine N., Cao S., Anthony L.H.V., Martin D., Prouse N.W., Scott M., Sztuc A.A., Uchida Y., Berardi V., Catanesi M.G., Radicioni E., Calabria N.F., Langella A., De Rosa G., Collazuol G., Iacob F., Mattiazzi M., Ludovici L., Gonin M., Pronost G., Fujisawa C., Maekawa Y., Nishimura Y., Okazaki R., Akutsu R., Friend M.

Proceedings of Science Vol. 444 2024.9

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：Proceedings of Science

The atmospheric neutrino-oxygen neutral-current quasielasatic (NCQE) reactions are one of the main background in the search for supernova relic neutrinos. Here, we report the first measurement of the atmospheric neutrino-oxygen NCQE cross section in the Super-Kamiokande Gadolinium (SK-Gd) experiment using 552.2 days of full SK-VI data. The measured NCQE cross section is 0.74 ± 0.22(stat.) +<inf>−</inf>0.86<inf>0.16</inf>(syst.) × 10−38 cm2, which is consistent with the theoretical NCQE cross section and the previous study in SK within the range of the uncertainty. Furthermore, we established the verification method for nucleon-nucleus interaction models using atmospheric neutrino events. We performed the verification using the Bertini Cascade model (BERT), the Binary Cascade model (BIC) and the Liège Intranuclear Cascade model (INCL++). As a result, we suggested that BIC and INCL++ are closer to the observed data.

DOI： 10.22323/1.444.1088

Open Access

Scopus
Status and Prospect of SK-Gd Project International coauthorship International journal Open Access

Hino Y., Abe K., Bronner C., Hayato Y., Hiraide K., Hosokawa K., Ieki K., Ikeda M., Kameda J., Kanemura Y., Kaneshima R., Kashiwagi Y., Kataoka Y., Miki S., Mine S., Miura M., Moriyama S., Nakano Y., Nakahata M., Nakayama S., Noguchi Y., Sato K., Sekiya H., Shiba H., Shimizu K., Shiozawa M., Sonoda Y., Suzuki Y., Takeda A., Takemoto Y., Tanaka H., Yano T., Han S., Kajita T., Okumura K., Tashiro T., Tomiya T., Wang X., Yoshida S., Fernandez P., Labarga L., Ospina N., Zaldivar B., Pointon B.W., Kearns E., Raaf J.L., Wan L., Wester T., Bian J., Griskevich N.J., Locke S., Smy M.B., Sobel H.W., Takhistov V., Yankelevich A., Hill J., Lee S.H., Moon D.H., Park R.G., Bodur B., Scholberg K., Walter C.W., Beauchêne A., Drapier O., Giampaolo A., Mueller T.A., Santos A.D., Paganini P., Quilain B., Nakamura T., Jang J.S., Machado L.N., Learned J.G., Choi K., Iovine N., Cao S., Anthony L.H.V., Martin D., Prouse N.W., Scott M., Sztuc A.A., Uchida Y., Berardi V., Catanesi M.G., Radicioni E., Calabria N.F., Langella A., De Rosa G., Collazuol G., Iacob F., Mattiazzi M., Ludovici L., Gonin M., Pronost G., Fujisawa C., Maekawa Y., Nishimura Y., Okazaki R., Akutsu R., Friend M.

Proceedings of Science Vol. 444 2024.9

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：Proceedings of Science

In 2020, a new phase of Super-Kamiokande experiment, SK-Gd, was started by loading gadolinium into the pure water. This led to a high neutron detection efficiency, which allows us to distinguish different neutrino reactions, enhance signals and remove backgrounds more efficiently. In the summer of 2022, an update of SK-Gd was done by adding additional Gd, and thus totally 39 tonnes of gadolinium sulfate octahydrate has been introduced in the water. The Gd concentration was estimated as 0.0332±0.0002% based on the dissolved weight of gadolinium sulfate octahydrate powder. It is consistent with the result of the direct sampling from the detector as 334 ± 4 ppm. The spallation neutron measurement and AmBe calibration confirms the shorter capture time constant and higher capture event rate due to the second loading. Therefore, we achieved 1.5 times higher than that of the first loaded phase as expected.

DOI： 10.22323/1.444.0983

Open Access

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Search for Boosted Dark Matter in Super-Kamiokande with low-energy electrons International coauthorship International journal Open Access

Iovine N., Abe K., Bronner C., Hayato Y., Hiraide K., Hosokawa K., Ieki K., Ikeda M., Kameda J., Kanemura Y., Kaneshima R., Kashiwagi Y., Kataoka Y., Miki S., Mine S., Miura M., Moriyama S., Nakano Y., Nakahata M., Nakayama S., Noguchi Y., Sato K., Sekiya H., Shiba H., Shimizu K., Shiozawa M., Sonoda Y., Suzuki Y., Takeda A., Takemoto Y., Tanaka H., Yano T., Han S., Kajita T., Okumura K., Tashiro T., Tomiya T., Wang X., Yoshida S., Fernandez P., Labarga L., Ospina N., Zaldivar B., Pointon B.W., Kearns E., Raaf J.L., Wan L., Wester T., Bian J., Griskevich N.J., Locke S., Smy M.B., Sobel H.W., Takhistov V., Yankelevich A., Hill J., Lee S.H., Moon D.H., Park R.G., Bodur B., Scholberg K., Walter C.W., Beauchene A., Drapier O., Giampaolo A., Mueller T.A., Santos A.D., Paganini P., Quilain B., Nakamura T., Jang J.S., Machado L.N., Learned J.G., Choi K., Cao S., Anthony L.H.V., Martin D., Prouse N.W., Scott M., Sztuc A.A., Uchida Y., Berardi V., Catanesi M.G., Radicioni E., Calabria N.F., Langella A., De Rosa G., Collazuol G., Iacob F., Mattiazzi M., Ludovici L., Gonin M., Pronost G., Fujisawa C., Maekawa Y., Nishimura Y., Okazaki R., Akutsu R., Friend M.

Proceedings of Science Vol. 444 2024.9

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：Proceedings of Science

Despite efforts from numerous experiments to grasp the nature of dark matter, no convincing dark matter signal has been observed so far and the very properties of this invisible matter remain unknown. Nevertheless, strong constraints on these properties are set by current observations, particularly for GeV to TeV WIMP-like dark matter particles. In contrast, sub-GeV dark matter scenarios are largely unexplored and still offer promising prospects for dark matter detection. In this contribution, we conduct a search for low-energy electrons scattered by boosted dark matter particles in the Super-Kamiokande detector. In particular, a two-component dark matter scenario is considered, which results in a natural boosting of the non-secluded secondary dark matter particles produced by the decay or annihilation of the dominant cold dark matter component. This work focuses on boosted dark matter from the centre of our Galaxy, with scattered electron energies ranging from a few MeV to a few hundred of MeV. We present the first sensitivities of such low-energy boosted dark matter search using Super-Kamiokande.

DOI： 10.22323/1.444.1365

Open Access

Scopus
Research on the development of stereoscopic contents for experiencing cosmic ray air showers and information provision methods. International journal Open Access

Tomida T., Kayama M., Abe Y., Ohkura H., Kajita H.C., Ikeda D., Menjo H., Kanai Y., Takahashi K.

Proceedings of Science Vol. 444 2024.9

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：Proceedings of Science

Air showers caused by high-energy cosmic rays are very large-scale natural phenomena in which a single particle interacts with an atmospheric nucleus and grows into hundreds of billions of particles on the ground. The air showers appear to reach the ground from an altitude of about 10 km, and their footprint on the ground is several kilometers in diameter. Despite this dynamic and interesting phenomenon, it is not well known to the general public. Most cosmic ray exhibits in science museums are based on real-time detection of natural radiation on the ground, and there are very few ways to convey the fascination of cosmic ray air showers. Therefore, we developed interactive content that shows cosmic ray air showers in a three-dimensional global panoramic image space. This content will be used in science museum exhibitions and educational events to promote awareness of cosmic rays. If the person experiencing the developed tool is interested in cosmic rays, explanatory video content will also be created to provide more detailed information about cosmic rays. The video content was published on YouTube by influencers. In this report, we will introduce the content of the air shower experience and discuss new information dissemination methods using the number of hits from the experience content to the explanatory video as a reference.

DOI： 10.22323/1.444.1605

Open Access

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Performances of the LHCf Arm1 detector during √s=13.6 TeV p- p operation in 2022 International coauthorship International journal Open Access

Kitagami Y., Adriani O., Berti E., Betti P., Bonechi L., Bongi M., D’Alessandro R., Detti S., Haguenauer M., Itow Y., Kasahara K., Kondo M., Matsubara Y., Menjo H., Muraki Y., Ohashi K., Papini P., Piparo G., Ricciarini S., Sako T., Sakurai N., Scaringella M., Shimizu Y., Tamura T., Tiberio A., Torii S., Tricomi A., Turner W.C., Yoshida K.

Proceedings of Science Vol. 444 2024.9

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The LHCf experiment obtained the data in the operation with pp collisions at √s = 13.6 TeV in 2022. The statistics is 10 times larger than that of the previous operation in 2015. This large statistics data allow us to measure the production of strange mesons like η and K0, and it will improve hadronic interaction models commonly used for simulations of air showers produced by ultra-high energy cosmic rays. The energy scale is one of the most important parameters for analyses of differential production cross-section measurements with the LHCf detectors. This paper presents the stability of the energy scale of the Arm1 detector during the operation in 2022 by using the reconstructed invariant mass of the π0 meson. As a result, we confirmed that the stability is about 1%.

DOI： 10.22323/1.444.0483

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Measurement of the very forward π0 and η meson productions in p-p collisions at √s = 13 TeV with the LHCf detector International coauthorship International journal Open Access

Piparo G., Adriani O., Berti E., Betti P., Bonechi L., Bongi M., D’Alessandro R., Detti S., Haguenauer M., Itow Y., Kasahara K., Kitagami Y., Kondo M., Matsubara Y., Menjo H., Muraki Y., Ohashi K., Papini P., Ricciarini S., Sako T., Sakurai N., Scaringella M., Shimizu Y., Silveri L., Tamura T., Tiberio A., Torii S., Tricomi A., Turner W.C., Yoshida K.

Proceedings of Science Vol. 444 2024.9

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The Large Hadron Collider forward (LHCf) experiment was designed to measure the production of neutral particles in the forward region of the CERN Large Hadron Collider (LHC) interactions. The goal of the experiment is to provide precise measurements of these particles to improve the understanding of ultra-high energy cosmic ray (UHECR) interactions with the Earth atmosphere. In this work, we would like to present the latest LHCf results relative to the measurement of the forward π0 and η meson productions in proton-proton collisions at √s = 13 TeV. This is the first observation of η mesons in the forward region of high-energy collisions. The measurements of the two meson productions play a crucial role in calibrating hadronic interaction models widely used in the simulation of the UHECR interactions with the atmosphere.

DOI： 10.22323/1.444.0447

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Measurement of the kaon to pion production ratio with the Super-Kamiokande International coauthorship International journal Open Access

Tada T., Nakano Y., Koshio Y., Abe K., Bronner C., Hayato Y., Hiraide K., Hosokawa K., Ieki K., Ikeda M., Kameda J., Kanemura Y., Kaneshima R., Kashiwagi Y., Kataoka Y., Miki S., Mine S., Miura M., Moriyama S., Nakano Y., Nakahata M., Nakayama S., Noguchi Y., Sato K., Sekiya H., Shiba H., Shimizu K., Shiozawa M., Sonoda Y., Suzuki Y., Takeda A., Takemoto Y., Tanaka H., Yano T., Han S., Kajita T., Okumura K., Tashiro T., Tomiya T., Wang X., Yoshida S., Fernandez P., Labarga L., Ospina N., Zaldivar B., Pointon B.W., Kearns E., Raaf J.L., Wan L., Wester T., Bian J., Griskevich N.J., Locke S., Smy M.B., Sobel H.W., Takhistov V., Yankelevich A., Hill J., Lee S.H., Moon D.H., Park R.G., Bodur B., Scholberg K., Walter C.W., Beauchêne A., Drapier O., Giampaolo A., Mueller T.A., Santos A.D., Paganini P., Quilain B., Nakamura T., Jang J.S., Machado L.N., Learned J.G., Choi K., Iovine N., Cao S., Anthony L.H.V., Martin D., Prouse N.W., Scott M., Sztuc A.A., Uchida Y., Berardi V., Catanesi M.G., Radicioni E., Calabria N.F., Langella A., De Rosa G., Collazuol G., Iacob F., Mattiazzi M., Ludovici L., Gonin M., Pronost G., Fujisawa C., Maekawa Y., Nishimura Y., Okazaki R.

Proceedings of Science Vol. 444 2024.9

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Cosmic-ray muons are generated from the decay of mesons which are secondary particles produced via hadronic interaction between primary cosmic-ray particles and atmospheric nuclei at the upper the atmosphere. The mesons such pions and kaons mostly decay into muons immediately, reflecting the details of the hadronic interactions depending on their energy and lifetime. The modulation of the cosmic-ray muon rate as well as the flux and the atmospheric kaon-to-pion production ratio are important to determine the flux and energy of the atmospheric neutrino. In particular, the kaon-to-pion production ratio r<inf>K/π</inf> is measured with the correlation coefficient α<inf>T</inf> between the cosmic-ray muon rate in the underground detector and the atmospheric temperature. As a result, we obtained the correlation coefficient r<inf>K/π</inf> = 0.85 ± 0.01 (statistical uncertainty only) and r<inf>K/π</inf> = 0.12 ± 0.03 (statistical uncertainty only) using the data taken in 10 years at the Super-Kamiokande detector. In this article, we report the current status of measurement of the modulation of the comic-ray muon and the atmospheric kaon-to-pion production ratio.

DOI： 10.22323/1.444.0214

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Scopus
Measurement of the charge ratio and polarization of cosmic-ray muon using the tagged decay-e events in Super-Kamiokande International coauthorship International journal Open Access

Nakano Y., Tada T., Kitagawa H., Koshio Y., Abe K., Bronner C., Hayato Y., Hiraide K., Hosokawa K., Ieki K., Ikeda M., Kameda J., Kanemura Y., Kaneshima R., Kashiwagi Y., Kataoka Y., Miki S., Mine S., Miura M., Moriyama S., Nakano Y., Nakahata M., Nakayama S., Noguchi Y., Sato K., Sekiya H., Shiba H., Shimizu K., Shiozawa M., Sonoda Y., Suzuki Y., Takeda A., Takemoto Y., Tanaka H., Yano T., Han S., Kajita T., Okumura K., Tashiro T., Tomiya T., Wang X., Yoshida S., Fernandez P., Labarga L., Ospina N., Zaldivar B., Pointon B.W., Kearns E., Raaf J.L., Wan L., Wester T., Bian J., Griskevich N.J., Locke S., Smy M.B., Sobel H.W., Takhistov V., Yankelevich A., Hill J., Lee S.H., Moon D.H., Park R.G., Bodur B., Scholberg K., Walter C.W., Beauchêne A., Drapier O., Giampaolo A., Mueller T.A., Santos A.D., Paganini P., Quilain B., Nakamura T., Jang J.S., Machado L.N., Learned J.G., Choi K., Iovine N., Cao S., Anthony L.H.V., Martin D., Prouse N.W., Scott M., Sztuc A.A., Uchida Y., Berardi V., Catanesi M.G., Radicioni E., Calabria N.F., Langella A., De Rosa G., Collazuol G., Iacob F., Mattiazzi M., Ludovici L., Gonin M., Pronost G., Fujisawa C., Maekawa Y., Nishimura Y.

Proceedings of Science Vol. 444 2024.9

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Neutrinos and muons from cosmic-ray interactions in the atmosphere originate from mesons, such as pions and kaons, in air-showers. An accuracy of the absolute atmospheric neutrino flux and its flavor ratio are limited due to the uncertainty of meson productions in hadronic interaction models. In order to reduce such uncertainty, measurements of the charge ratio and the polarization of cosmic-ray muons are important as new inputs to theoretical models which simulate the atmospheric neutrino flux. In this proceedings, we present the results of the charge ratio (R) and polarization (Pμ<inf>0</inf>) of cosmic-ray muon measurements using the decay electrons collected from 2008 September to 2022 June by the Super-Kamiokande (SK) detector. We measured muon charge ratio to be R = 1.32±0.02 (stat.+syst.) and the muon polarization at the production location to be Pμ<inf>0</inf> = 0.52±0.01 (stat.+syst.). The SK detector uniquely measured the polarization of cosmic-ray muons with energies more than 1 TeV at sea-level because of its underground location.

DOI： 10.22323/1.444.0212

Open Access

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Measurement of cosmogenic 9Li in Super-Kamiokande with gadolinium loaded water International coauthorship International journal Open Access

Shinoki M., Abe K., Bronner C., Hayato Y., Hiraide K., Hosokawa K., Ieki K., Ikeda M., Kameda J., Kanemura Y., Kaneshima R., Kashiwagi Y., Kataoka Y., Miki S., Mine S., Miura M., Moriyama S., Nakano Y., Nakahata M., Nakayama S., Noguchi Y., Sato K., Sekiya H., Shiba H., Shimizu K., Shiozawa M., Sonoda Y., Suzuki Y., Takeda A., Takemoto Y., Tanaka H., Yano T., Han S., Kajita T., Okumura K., Tashiro T., Tomiya T., Wang X., Yoshida S., Fernandez P., Labarga L., Ospina N., Zaldivar B., Pointon B.W., Kearns E., Raaf J.L., Wan L., Wester T., Bian J., Griskevich N.J., Locke S., Smy M.B., Sobel H.W., Takhistov V., Yankelevich A., Hill J., Lee S.H., Moon D.H., Park R.G., Bodur B., Scholberg K., Walter C.W., Beauchêne A., Drapier O., Giampaolo A., Mueller T.A., Santos A.D., Paganini P., Quilain B., Nakamura T., Jang J.S., Machado L.N., Learned J.G., Choi K., Iovine N., Cao S., Anthony L.H.V., Martin D., Prouse N.W., Scott M., Sztuc A.A., Uchida Y., Berardi V., Catanesi M.G., Radicioni E., Calabria N.F., Langella A., De Rosa G., Collazuol G., Iacob F., Mattiazzi M., Ludovici L., Gonin M., Pronost G., Fujisawa C., Maekawa Y., Nishimura Y., Okazaki R., Akutsu R., Friend M.

Proceedings of Science Vol. 444 2024.9

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：Proceedings of Science

Super-Kamiokande is a large water Cherenkov detector located approximately 1,000 m underground in Kamioka, Japan. The detector is a cylindrical tank 39.3 m in diameter and 41.4 m high, filled with about 50 kton of gadolinium loaded water. We measured 9Li isotopic nuclei produced by muon spallation using the data taken from 2020 to 2022 by the Super-Kamiokande detector with 0.011% gadolinium concentration in water. Cosmic-ray muons that penetrate the detector form hadron showers in water and secondary hadrons produce unstable radioisotopes through the spallation. Among those spallation products, 9Li is a long-lived radioactive isotope with a lifetime of about 0.26 seconds. It emits an electron and a neutron at a branching ratio of 50.8%, which is difficult to distinguish from the inverse beta decay caused by electron antineutrinos. Therefore, 9Li is one of the main background sources in the observation of diffuse supernova neutrino background. In this study, the energy spectrum of the electrons was measured with a threshold at 4.5 MeV which is lowered from the previous result with pure water. We will report the analysis method and results.

DOI： 10.22323/1.444.1058

Open Access

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First result of a search for Diffuse Supernova Neutrino Background in SK-Gd experiment International coauthorship International journal Open Access

Harada M., Abe K., Bronner C., Hayato Y., Hiraide K., Hosokawa K., Ieki K., Ikeda M., Kameda J., Kanemura Y., Kaneshima R., Kashiwagi Y., Kataoka Y., Miki S., Mine S., Miura M., Moriyama S., Nakano Y., Nakahata M., Nakayama S., Noguchi Y., Sato K., Sekiya H., Shiba H., Shimizu K., Shiozawa M., Sonoda Y., Suzuki Y., Takeda A., Takemoto Y., Tanaka H., Yano T., Han S., Kajita T., Okumura K., Tashiro T., Tomiya T., Wang X., Yoshida S., Fernandez P., Labarga L., Ospina N., Zaldivar B., Pointon B.W., Kearns E., Raaf J.L., Wan L., Wester T., Bian J., Griskevich N.J., Locke S., Smy M.B., Sobel H.W., Takhistov V., Yankelevich A., Hill J., Lee S.H., Moon D.H., Park R.G., Bodur B., Scholberg K., Walter C.W., Beauchêne A., Drapier O., Giampaolo A., Mueller T.A., Santos A.D., Paganini P., Quilain B., Nakamura T., Jang J.S., Machado L.N., Learned J.G., Choi K., Iovine N., Cao S., Anthony L.H.V., Martin D., Prouse N.W., Scott M., Sztuc A.A., Uchida Y., Berardi V., Catanesi M.G., Radicioni E., Calabria N.F., Langella A., De Rosa G., Collazuol G., Iacob F., Mattiazzi M., Ludovici L., Gonin M., Pronost G., Fujisawa C., Maekawa Y., Nishimura Y., Okazaki R., Akutsu R., Friend M.

Proceedings of Science Vol. 444 2024.9

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：Proceedings of Science

Since 2020, Super-Kamiokande (SK) detector has been updated by loading gadolinium (Gd) as a new experimental phase, ‘SK-Gd.’ In the SK-Gd experiment, we can search low-energy electron antineutrinos via inverse-beta decay with efficient neutron identification thanks to high cross-section and high-energy gamma-ray emission of thermal neutron capture on Gd. Until July 2022, the observation is operated with the 0.01% Gd mass concentration. The neutron capture fraction on Gd is about 50% in this situation. In this paper, the first search result for the flux of astrophysical electron antineutrinos for the energy range of O(10) MeV in SK-Gd with a 22.5 × 552 kton·day exposure at 0.01% Gd mass concentration of the initial stage of SK-Gd is reported.

DOI： 10.22323/1.444.1173

Open Access

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Evaluation of neutron tagging efficiency on 0.03% Gd mass concentration in SK-Gd experiment International coauthorship International journal Open Access

Nakanishi F., Abe K., Bronner C., Hayato Y., Hiraide K., Hosokawa K., Ieki K., Ikeda M., Kameda J., Kanemura Y., Kaneshima R., Kashiwagi Y., Kataoka Y., Miki S., Mine S., Miura M., Moriyama S., Nakano Y., Nakahata M., Nakayama S., Noguchi Y., Sato K., Sekiya H., Shiba H., Shimizu K., Shiozawa M., Sonoda Y., Suzuki Y., Takeda A., Takemoto Y., Tanaka H., Yano T., Han S., Kajita T., Okumura K., Tashiro T., Tomiya T., Wang X., Yoshida S., Fernandez P., Labarga L., Ospina N., Zaldivar B., Pointon B.W., Kearns E., Raaf J.L., Wan L., Wester T., Bian J., Griskevich N.J., Locke S., Smy M.B., Sobel H.W., Takhistov V., Yankelevich A., Hill J., Lee S.H., Moon D.H., Park R.G., Bodur B., Scholberg K., Walter C.W., Beauchêne A., Drapier O., Giampaolo A., Mueller T.A., Santos A.D., Paganini P., Quilain B., Nakamura T., Jang J.S., Machado L.N., Learned J.G., Choi K., Iovine N., Cao S., Anthony L.H.V., Martin D., Prouse N.W., Scott M., Sztuc A.A., Uchida Y., Berardi V., Catanesi M.G., Radicioni E., Calabria N.F., Langella A., De Rosa G., Collazuol G., Iacob F., Mattiazzi M., Ludovici L., Gonin M., Pronost G., Fujisawa C., Maekawa Y., Nishimura Y., Okazaki R., Akutsu R., Friend M.

Proceedings of Science Vol. 444 2024.9

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：Proceedings of Science

Super-Kamiokande (SK) experiment started the "SK-Gd experiment" by dissolving gadolinium (Gd) sulfate octa-hydrate in ultra-pure water from the tank in July 2020. The neutron tagging efficiency has been improved compared to the pure-water phase by detecting a total energy of 8 MeV gamma rays emitted by thermal neutron capture on Gd. It enables us to improve, for example, the sensitivity of diffuse supernova neutrino background, the accuracy of the reconstruction for the supernova direction, and so on. For these physics targets, accurate evaluation of neutron identification efficiency is essential. In this presentation, I report the calibration results using an Am/Be neutron source to evaluate the efficiency at a Gd mass concentration of 0.03%, starting from June 2022, and the comparison of the estimated neutron detection efficiency with simulation.

DOI： 10.22323/1.444.1172

Open Access

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New methods and simulations for cosmogenic induced spallation removal in Super-Kamiokande-IV Reviewed International coauthorship International journal Open Access

Locke, S; Coffani, A; Abe, K; Bronner, C; Hayato, Y; Ikeda, M; Imaizumi, S; Ito, H; Kameda, J; Kataoka, Y; Miura, M; Moriyama, S; Nagao, Y; Nakahata, M; Nakajima, Y; Nakayama, S; Okada, T; Okamoto, K; Orii, A; Pronost, G; Sekiya, H; Shiozawa, M; Sonoda, Y; Suzuki, Y; Takeda, A; Takemoto, Y; Takenaka, A; Tanaka, H; Yano, T; Hirade, K; Kanemura, Y; Miki, S; Watabe, S; Han, S; Kajita, T; Okumura, K; Tashiro, T; Xia, J; Wang, X; Megias, GD; Bravo-Berguño, D; Labarga, L; Marti, L; Zaldivar, B; Pointon, BW; Blaszczyk, FDM; Kearns, E; Raaf, JL; Stone, JL; Wan, L; Wester, T; Bian, J; Griskevich, NJ; Kropp, WR; Mine, S; Smy, MB; Sobel, HW; Takhistov, V; Weatherly, P; Yankelevich, A; Hill, J; Kim, JY; Lim, IT; Park, RG; Bodur, B; Scholberg, K; Walter, CW; Bernard, L; Drapier, O; El Hedri, S; Giampaolo, A; Gonin, M; Mueller, TA; Paganini, P; Quilain, B; Santos, AD; Ishizuka, T; Nakamura, T; Jang, JS; Learned, JG; Anthony, LHV; Sztuc, AA; Uchida, Y; Martin, D; Scott, M; Berardi, V; Catanesi, MG; Radicioni, E; Calabria, NF; Machado, LN; De Rosa, G; Collazuol, G; Iacob, F; Lamoureux, M; Ospina, N; Mattiazzi, M; Ludovici, L; Nishimura, Y; Maewaka, Y; Cao, S; Friend, M; Hasegawa, T; Ishida, T; Kobayashi, T; Jakkapu, M; Matsubara, T; Nakadaira, T; Nakamura, K; Oyama, Y; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Nakano, Y; Shiozawa, T; Suzuki, AT; Takeuchi, Y; Yamamoto, S; Kotsar, Y; Ozaki, H; Ali, A; Ashida, Y; Feng, J; Hirota, S; Ichikawa, AK; Kikawa, T; Mori, M; Nakaya, T; Wendell, RA; Yasutome, K; Fernandez, P; McCauley, N; Mehta, P; Tsui, KM; Fukuda, Y; Itow, Y; Menjo, H; Niwa, T; Sato, K; Tsukada, M; Mijakowski, P; Lagoda, J; Lakshmi, SM; Zalipska, J; Jung, CK; Vilela, C; Wilking, MJ; Yanagisawa, C; Jiang, J; Hagiwara, K; Harada, M; Horai, T; Ishino, H; Ito, S; Koshio, Y; Ma, W; Piplani, N; Sakai, S; Kitagawa, H; Barr, G; Barrow, D; Cook, L; Goldsack, A; Samani, S; Wark, D; Nova, F; Boschi, T; Di Lodovico, F; Taani, M; Zsoldos, S; Gao, J; Migenda, J; Yang, JY; Jenkins, SJ; Malek, M; McElwee, JM; Stone, O; Thiesse, MD; Thompson, LF; Okazawa, H; Nakamura, K; Kim, SB; Yu, I; Seo, JW; Nishijima, K; Koshiba, M; Iwamoto, K; Ogawa, N; Yokoyama, M; Martens, K; Vagins, MR; Nakagiri, K; Kuze, M; Izumiyama, S; Yoshida, T; Inomoto, M; Ishitsuka, M; Matsumoto, R; Ohta, K; Shinoki, M; Suganuma, T; Kinoshita, T; Martin, JF; Tanaka, HA; Towstego, T; Akutsu, R; Hartz, M; Konaka, A; de Perio, P; Prouse, NW; Chen, S; Xu, BD; Zhang, Y; Posiadala-Zezula, M; Richards, B; Jamieson, B; Walker, J; Minamino, A; Okamoto, K; Pintaudi, G; Sasaki, R

PHYSICAL REVIEW D Vol. 110 ( 3 ) 2024.8

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Language：English Publishing type：Research paper (scientific journal) Publisher：Physical Review D

Radioactivity induced by cosmic muon spallation is a dominant source of backgrounds for O(10 MeV) neutrino interactions in water Cherenkov detectors. In particular, it is crucial to reduce backgrounds to measure the solar neutrino spectrum and find neutrino interactions from distant supernovae. In this paper we introduce new techniques to locate muon-induced hadronic showers and efficiently reject spallation backgrounds. Applying these techniques to the solar neutrino analysis with an exposure of 2790×22.5 kton·day increases the signal efficiency by 12.6%, approximately corresponding to an additional year of detector running. Furthermore, we present the first spallation simulation at Super-Kamiokande, where we model hadronic interactions using fluka. The agreement between the isotope yields and shower pattern in this simulation and in the data gives confidence in the accuracy of this simulation, and thus opens the door to use it to optimize muon spallation removal in new data with gadolinium-enhanced neutron capture detection.

DOI： 10.1103/PhysRevD.110.032003

Open Access

Web of Science

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Second gadolinium loading to Super-Kamiokande Reviewed International coauthorship International journal Open Access

Abe, K; Bronner, C; Hayato, Y; Hiraide, K; Hosokawa, K; Ieki, K; Ikeda, M; Kameda, J; Kanemura, Y; Kaneshima, R; Kashiwagi, Y; Kataoka, Y; Miki, S; Mine, S; Miura, M; Moriyama, S; Nakano, Y; Nakahata, M; Nakayama, S; Noguchi, Y; Sato, K; Sekiya, H; Shiba, H; Shimizu, K; Shiozawa, M; Sonoda, Y; Suzuki, Y; Takeda, A; Takemoto, Y; Tanaka, H; Yano, T; Han, S; Kajita, T; Okumura, K; Tashiro, T; Tomiya, T; Wang, X; Yoshida, S; Fernandez, P; Labarga, L; Ospina, N; Zaldivar, B; Pointon, BW; Kearns, E; Raaf, JL; Wan, L; Wester, T; Bian, J; Griskevich, NJ; Smy, MB; Sobel, HW; Takhistov, V; Yankelevich, A; Hill, J; Jang, MC; Lee, SH; Moon, DH; Park, RG; Bodur, B; Scholberg, K; Walter, CW; Beauchêne, A; Drapier, O; Giampaolo, A; Mueller, TA; Santos, AD; Paganini, P; Quilain, B; Rogly, R; Nakamura, T; Jang, JS; Machado, LN; Learned, JG; Choi, K; Iovine, N; Cao, S; Anthony, LHV; Martin, D; Prouse, NW; Scott, M; Uchida, Y; Berardi, V; Calabria, NF; Catanesi, MG; Radicioni, E; Langella, A; De Rosa, G; Collazuol, G; Iacob, F; Mattiazzi, M; Ludovici, L; Gonin, M; Périssé, L; Pronost, G; Fujisawa, C; Maekawa, Y; Nishimura, Y; Okazaki, R; Akutsu, R; Friend, M; Hasegawa, T; Ishida, T; Kobayashi, T; Jakkapu, M; Matsubara, T; Nakadaira, T; Nakamura, K; Oyama, Y; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Bhuiyan, N; Burton, GT; Di Lodovico, F; Gao, J; Goldsack, A; Katori, T; Migenda, J; Ramsden, RM; Xie, Z; Zsoldos, S; Suzuki, AT; Takagi, Y; Takeuchi, Y; Zhong, H; Feng, J; Feng, L; Hu, JR; Hu, Z; Kawaue, M; Kikawa, T; Mori, M; Nakaya, T; Wendell, RA; Yasutome, K; Jenkins, SJ; McCauley, N; Mehta, P; Tarant, A; Wilking, MJ; Fukuda, Y; Itow, Y; Menjo, H; Ninomiya, K; Yoshioka, Y; Lagoda, J; Mandal, M; Mijakowski, P; Prabhu, YS; Zalipska, J; Jia, M; Jiang, J; Shi, W; Yanagisawa, C; Harada, M; Hino, Y; Ishino, H; Koshio, Y; Nakanishi, F; Sakai, S; Tada, T; Tano, T; Ishizuka, T; Barr, G; Barrow, D; Cook, L; Samani, S; Wark, D; Holin, A; Nova, F; Jung, S; Yang, BS; Yang, JY; Yoo, J; Fannon, JEP; Kneale, L; Malek, M; McElwee, JM; Thiesse, MD; Thompson, LF; Wilson, ST; Okazawa, H; Lakshmi, SM; Kim, SB; Kwon, E; Seo, JW; Yu, I; Ichikawa, AK; Nakamura, K; Tairafune, S; Nishijima, K; Eguchi, A; Nakagiri, K; Nakajima, Y; Shima, S; Taniuchi, N; Watanabe, E; Yokoyama, M; de Perio, P; Fujita, S; Jesús-Valls, C; Martens, K; Tsui, KM; Vagins, MR; Xia, J; Izumiyama, S; Kuze, M; Matsumoto, R; Terada, K; Ishitsuka, M; Ito, H; Ommura, Y; Shigeta, N; Shinoki, M; Yamauchi, K; Yoshida, T; Gaur, R; Gousy-Leblanc, V; Hartz, M; Konaka, A; Li, X; Chen, S; Xu, BD; Zhang, B; Posiadala-Zezula, M; Boyd, SB; Edwards, R; Hadley, D; Nicholson, M; O'Flaherty, M; Richards, B; Ali, A; Jamieson, B; Amanai, S; Marti, L; Minamino, A; Suzuki, S; Scovell, PR; Meehan, E; Bandac, I; Peña-Garay, C; Pérez, J; Gileva, O; Lee, EK; Leonard, DS; Sakakieda, Y; Sakaguchi, A; Sueki, K; Takaku, Y; Yamasaki, S

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT Vol. 1065 2024.8

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Language：English Publishing type：Research paper (scientific journal) Publisher：Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment

The first loading of gadolinium (Gd) into Super-Kamiokande in 2020 was successful, and the neutron capture efficiency on Gd reached 50%. To further increase the Gd neutron capture efficiency to 75%, 26.1 tons of Gd<inf>2</inf>(SO<inf>4</inf>)<inf>3</inf>⋅8H<inf>2</inf>O was additionally loaded into Super-Kamiokande (SK) from May 31 to July 4, 2022. As the amount of loaded Gd<inf>2</inf>(SO<inf>4</inf>)<inf>3</inf>⋅8H<inf>2</inf>O was doubled compared to the first loading, the capacity of the powder dissolving system was doubled. We also developed new batches of gadolinium sulfate with even further reduced radioactive impurities. In addition, a more efficient screening method was devised and implemented to evaluate these new batches of Gd<inf>2</inf>(SO<inf>4</inf>)<inf>3</inf>⋅8H<inf>2</inf>O. Following the second loading, the Gd concentration in SK was measured to be 333.5±2.5 ppm via an Atomic Absorption Spectrometer (AAS). From the mean neutron capture time constant of neutrons from an Am/Be calibration source, the Gd concentration was independently measured to be 332.7 ± 6.8(sys.) ± 1.1(stat.) ppm, consistent with the AAS result. Furthermore, during the loading the Gd concentration was monitored continually using the capture time constant of each spallation neutron produced by cosmic-ray muons, and the final neutron capture efficiency was shown to become 1.5 times higher than that of the first loaded phase, as expected.

DOI： 10.1016/j.nima.2024.169480

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Performance of SK-Gd's Upgraded Real-time Supernova Monitoring System Reviewed International coauthorship International journal Open Access

Kashiwagi, Y; Abe, K; Bronner, C; Hayato, Y; Hiraide, K; Hosokawa, K; Ieki, K; Ikeda, M; Kameda, J; Kanemura, Y; Kaneshima, R; Kataoka, Y; Miki, S; Mine, S; Miura, M; Moriyama, S; Nakano, Y; Nakahata, M; Nakayama, S; Noguchi, Y; Sato, K; Sekiya, H; Shiba, H; Shimizu, K; Shiozawa, M; Sonoda, Y; Suzuki, Y; Takeda, A; Takemoto, Y; Tanaka, H; Yano, T; Han, S; Kajita, T; Okumura, K; Tashiro, T; Tomiya, T; Wang, X; Yoshida, S; Fernandez, P; Labarga, L; Ospina, N; Zaldivar, B; Pointon, BW; Kearns, E; Raaf, JL; Wan, L; Wester, T; Bian, J; Griskevich, NJ; Locke, S; Smy, MB; Sobel, HW; Takhistov, V; Yankelevich, A; Hill, J; Jang, MC; Lee, SH; Moon, DH; Park, RG; Bodur, B; Scholberg, K; Walter, CW; Beauchêne, A; Drapier, O; Giampaolo, A; Mueller, TA; Santos, AD; Paganini, P; Quilain, B; Rogly, R; Nakamura, T; Jang, JS; Machado, LN; Learned, JG; Choi, K; Iovine, N; Cao, S; Anthony, LHV; Martin, D; Prouse, NW; Scott, M; Sztuc, AA; Uchida, Y; Berardi, V; Catanesi, MG; Radicioni, E; Calabria, NF; Langella, A; De Rosa, G; Collazuol, G; Iacob, F; Mattiazzi, M; Ludovici, L; Gonin, M; Périssé, L; Pronost, G; Fujisawa, C; Maekawa, Y; Nishimura, Y; Okazaki, R; Akutsu, R; Friend, M; Hasegawa, T; Ishida, T; Kobayashi, T; Jakkapu, M; Matsubara, T; Nakadaira, T; Nakamura, K; Oyama, Y; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Bhuiyan, N; Burton, GT; Di Lodovico, F; Gao, J; Goldsack, A; Katori, T; Migenda, J; Ramsden, RM; Xie, Z; Zsoldos, S; Suzuki, AT; Takagi, Y; Takeuchi, Y; Zhong, H; Feng, J; Feng, L; Hu, JR; Hu, Z; Kawaue, M; Kikawa, T; Mori, M; Nakaya, T; Wendell, RA; Yasutome, K; Jenkins, SJ; McCauley, N; Mehta, P; Tarrant, A; Fukuda, Y; Itow, Y; Menjo, H; Ninomiya, K; Yoshioka, Y; Lagoda, J; Lakshmi, SM; Mandal, M; Mijakowski, P; Prabhu, YS; Zalipska, J; Jia, M; Jiang, J; Jung, CK; Shi, W; Wilking, MJ; Yanagisawa, C; Harada, M; Hino, Y; Ishino, H; Koshio, Y; Nakanishi, F; Sakai, S; Tada, T; Tano, T; Ishizuka, T; Barr, G; Barrow, D; Cook, L; Samani, S; Wark, D; Holin, A; Nova, F; Jung, S; Yang, BS; Yang, JY; Yoo, J; Fannon, JEP; Kneale, L; Malek, M; McElwee, JM; Thiesse, MD; Thompson, LF; Wilson, ST; Okazawa, H; Kim, SB; Kwon, E; Seo, JW; Yu, I; Ichikawa, AK; Nakamura, KD; Tairafune, S; Nishijima, K; Eguchi, A; Nakagiri, K; Nakajima, Y; Shima, S; Taniuchi, N; Watanabe, E; Yokoyama, M; de Perio, P; Fujita, S; Jesús-Valls, C; Martens, K; Tsui, KM; Vagins, MR; Xia, J; Kuze, M; Izumiyama, S; Matsumoto, R; Ishitsuka, M; Ito, H; Ommura, Y; Shigeta, N; Shinoki, M; Yamauchi, K; Yoshida, T; Gaur, R; Gousy-Leblanc, V; Hartz, M; Konaka, A; Li, X; Chen, S; Xu, BD; Zhang, B; Posiadala-Zezula, M; Boyd, SB; Edwards, R; Hadley, D; Nicholson, M; O'Flaherty, M; Richards, B; Ali, A; Jamieson, B; Amanai, S; Marti, L; Minamino, A; Suzuki, S

ASTROPHYSICAL JOURNAL Vol. 970 ( 1 ) 2024.7

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Language：English Publishing type：Research paper (scientific journal) Publisher：Astrophysical Journal

Among multimessenger observations of the next Galactic core-collapse supernova, Super-Kamiokande (SK) plays a critical role in detecting the emitted supernova neutrinos, determining the direction to the supernova (SN), and notifying the astronomical community of these observations in advance of the optical signal. In 2022, SK has increased the gadolinium dissolved in its water target (SK-Gd) and has achieved a Gd concentration of 0.033%, resulting in enhanced neutron detection capability, which in turn enables more accurate determination of the supernova direction. Accordingly, SK-Gd’s real-time supernova monitoring system has been upgraded. SK_SN Notice, a warning system that works together with this monitoring system, was released on 2021 December 13, and is available through GCN Notices. When the monitoring system detects an SN-like burst of events, SK_SN Notice will automatically distribute an alarm with the reconstructed direction to the supernova candidate within a few minutes. In this paper, we present a systematic study of SK-Gd’s response to a simulated Galactic SN. Assuming a supernova situated at 10 kpc, neutrino fluxes from six supernova models are used to characterize SK-Gd’s pointing accuracy using the same tools as the online monitoring system. The pointing accuracy is found to vary from 3° to 7° depending on the models. However, if the supernova is closer than 10 kpc, SK_SN Notice can issue an alarm with three-degree accuracy, which will benefit follow-up observations by optical telescopes with large fields of view.

DOI： 10.3847/1538-4357/ad4d8e

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Search for Periodic Time Variations of the Solar 8B Neutrino Flux between 1996 and 2018 in Super-Kamiokande Reviewed International coauthorship International journal Open Access

Abe, K; Bronner, C; Hayato, Y; Hiraide, K; Hosokawa, K; Ieki, K; Ikeda, M; Kameda, J; Kanemura, Y; Kaneshima, R; Kashiwagi, Y; Kataoka, Y; Miki, S; Mine, S; Miura, M; Moriyama, S; Nakano, Y; Nakahata, M; Nakayama, S; Noguchi, Y; Sato, K; Sekiya, H; Shiba, H; Shimizu, K; Shiozawa, M; Sonoda, Y; Suzuki, Y; Takeda, A; Takemoto, Y; Tanaka, H; Yano, T; Han, S; Kajita, T; Okumura, K; Tashiro, T; Tomiya, T; Wang, X; Yoshida, S; Fernandez, P; Labarga, L; Ospina, N; Zaldivar, B; Pointon, BW; Kearns, E; Raaf, JL; Wan, L; Wester, T; Bian, J; Griskevich, NJ; Locke, S; Smy, MB; Sobel, HW; Takhistov, V; Yankelevich, A; Hill, J; Lee, SH; Moon, DH; Park, RG; Jang, MC; Bodur, B; Scholberg, K; Walter, CW; Beauchene, A; Drapier, O; Giampaolo, A; Mueller, TA; Santos, AD; Paganini, P; Quilain, B; Nakamura, T; Jang, JS; Machado, LN; Learned, JG; Choi, K; Iovine, N; Cao, S; Anthony, LHV; Martin, D; Prouse, NW; Scott, M; Sztuc, AA; Uchida, Y; Berardi, V; Catanesi, MG; Radicioni, E; Calabria, NF; Langella, A; De Rosa, G; Collazuol, G; Iacob, F; Mattiazzi, M; Ludovici, L; Gonin, M; Pronost, G; Fujisawa, C; Maekawa, Y; Nishimura, Y; Okazaki, R; Akutsu, R; Friend, M; Hasegawa, T; Ishida, T; Kobayashi, T; Jakkapu, M; Matsubara, T; Nakadaira, T; Nakamura, K; Oyama, Y; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Bhuiyan, N; Burton, GT; Di Lodovico, F; Gao, J; Goldsack, A; Katori, T; Migenda, J; Xie, Z; Ramsden, RM; Zsoldos, S; Suzuki, AT; Takagi, Y; Zhong, H; Takeuchi, Y; Feng, J; Feng, L; Hu, JR; Hu, Z; Kikawa, T; Mori, M; Kawaue, M; Nakaya, T; Wendell, RA; Yasutome, K; Jenkins, SJ; McCauley, N; Mehta, P; Tarant, A; Fukuda, Y; Itow, Y; Menjo, H; Ninomiya, K; Yoshioka, Y; Lagoda, J; Lakshmi, SM; Mandal, M; Mijakowski, P; Prabhu, YS; Zalipska, J; Jia, M; Jiang, J; Jung, CK; Wilking, MJ; Yanagisawa, C; Shi, W; Harada, M; Hino, Y; Ishino, H; Koshio, Y; Nakanishi, F; Sakai, S; Tada, T; Tano, T; Ishizuka, T; Barr, G; Barrow, D; Cook, L; Samani, S; Wark, D; Holin, A; Nova, F; Yang, BS; Yang, JY; Yoo, J; Jung, S; Fannon, JEP; Kneale, L; Malek, M; McElwee, JM; Thiesse, MD; Thompson, LF; Wilson, ST; Okazawa, H; Kim, SB; Kwon, E; Seo, JW; Yu, I; Ichikawa, AK; Nakamura, KD; Tairafune, S; Nishijima, K; Eguchi, A; Nakagiri, K; Nakajima, Y; Shima, S; Taniuchi, N; Watanabe, E; Yokoyama, M; de Perio, P; Fujita, S; Martens, K; Tsui, KM; Vagins, MR; Xia, J; Izumiyama, S; Kuze, M; Matsumoto, R; Ishitsuka, M; Ito, H; Ommura, Y; Shigeta, N; Shinoki, M; Yamauchi, K; Yoshida, T; Gaur, R; Gousy-Leblanc, V; Hartz, M; Konaka, A; Li, X; Chen, S; Xu, BD; Zhang, B; Posiadala-Zezula, M; Boyd, SB; Edwards, R; Hadley, D; Nicholson, M; O'Flaherty, M; Richards, B; Ali, A; Jamieson, B; Amanai, S; Marti, L; Minamino, A; Suzuki, S

PHYSICAL REVIEW LETTERS Vol. 132 ( 24 ) page： 241803 2024.6

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Language：English Publishing type：Research paper (scientific journal) Publisher：Physical Review Letters

We report a search for time variations of the solar B8 neutrino flux using 5804 live days of Super-Kamiokande data collected between May 31, 1996, and May 30, 2018. Super-Kamiokande measured the precise time of each solar neutrino interaction over 22 calendar years to search for solar neutrino flux modulations with unprecedented precision. Periodic modulations are searched for in a dataset comprising five-day interval solar neutrino flux measurements with a maximum likelihood method. We also applied the Lomb-Scargle method to this dataset to compare it with previous reports. The only significant modulation found is due to the elliptic orbit of the Earth around the Sun. The observed modulation is consistent with astronomical data: we measured an eccentricity of (1.53±0.35)%, and a perihelion shift of (-1.5±13.5) days.

DOI： 10.1103/PhysRevLett.132.241803

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PubMed
Solar neutrino measurements using the full data period of Super-Kamiokande-IV Reviewed International coauthorship International journal

Abe, K; Bronner, C; Hayato, Y; Hiraide, K; Hosokawa, K; Ieki, K; Ikeda, M; Imaizumi, S; Iyogi, K; Kameda, J; Kanemura, Y; Kaneshima, R; Kashiwagi, Y; Kataoka, Y; Kato, Y; Kishimoto, Y; Miki, S; Mine, S; Miura, M; Mochizuki, T; Moriyama, S; Nagao, Y; Nakahata, M; Nakano, Y; Nakayama, S; Noguchi, Y; Okada, T; Okamoto, K; Orii, A; Sato, K; Sekiya, H; Shiba, H; Shimizu, K; Shiozawa, M; Sonoda, Y; Suzuki, Y; Takeda, A; Takemoto, Y; Takenaka, A; Tanaka, H; Watanabe, S; Yano, T; Han, S; Kajita, T; Okumura, K; Tashiro, T; Tomiya, T; Wang, R; Wang, X; Yoshida, S; Bravo-Berguño, D; Fernandez, P; Labarga, L; Ospina, N; Zaldivar, B; Pointon, BW; Blaszczyk, FDM; Kachulis, C; Kearns, E; Raaf, JL; Stone, JL; Wan, L; Wester, T; Bian, J; Griskevich, NJ; Kropp, WR; Locke, S; Smy, MB; Sobel, HW; Takhistov, V; Weatherly, P; Yankelevich, A; Ganezer, KS; Hill, J; Jang, MC; Kim, JY; Lee, S; Lim, IT; Moon, DH; Park, RG; Bodur, B; Scholberg, K; Walter, CW; Beauchêne, A; Bernard, L; Coffani, A; Drapier, O; El Hedri, S; Giampaolo, A; Imber, J; Mueller, TA; Paganini, P; Rogly, R; Quilain, B; Santos, A; Nakamura, T; Jang, JS; Machado, LN; Learned, JG; Matsuno, S; Iovine, N; Choi, K; Cao, S; Anthony, LHV; Litchfield, RP; Prouse, N; Marin, D; Scott, M; Sztuc, AA; Uchida, Y; Berardi, V; Catanesi, MG; Intonti, RA; Radicioni, E; Calabria, NF; De Rosa, G; Langella, A; Collazuol, G; Iacob, F; Lamoureux, M; Mattiazzi, M; Ludovici, L; Gonin, M; Périssé, L; Pronost, G; Fujisawa, C; Maekawa, Y; Nishimura, Y; Okazaki, R; Friend, M; Hasegawa, T; Ishida, T; Jakkapu, M; Kobayashi, T; Matsubara, T; Nakadaira, T; Nakamura, K; Oyama, Y; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Boschi, T; Bhuiyan, N; Burton, GT; Gao, J; Goldsack, A; Katori, T; Di Lodovico, F; Migenda, J; Sedgwick, SM; Ramsden, RM; Taani, M; Xie, Z; Zsoldos, S; Abe, K; Hasegawa, M; Isobe, Y; Kotsar, Y; Miyabe, H; Ozaki, H; Shiozawa, T; Sugimoto, T; Suzuki, AT; Takagi, Y; Takeuchi, Y; Yamamoto, S; Zhong, H; Ashida, Y; Feng, J; Feng, L; Hayashino, T; Hirota, S; Hu, JR; Hu, Z; Jiang, M; Kawaue, M; Kikawa, T; Mori, M; Nakamura, K; Nakaya, T; Wendell, RA; Yasutome, K; Jenkins, SJ; McCauley, N; Mehta, P; Pritchard, A; Tarrant, A; Wilking, MJ; Fukuda, Y; Itow, Y; Menjo, H; Murase, M; Ninomiya, K; Niwa, T; Tsukada, M; Yoshioka, Y; Frankiewicz, K; Lagoda, J; Mandal, M; Mijakowski, P; Prabhu, YS; Zalipska, J; Jiang, J; Jia, M; Jung, CK; Palomino, JL; Santucci, G; Shi, W; Vilela, C; Yanagisawa, C; Fukuda, D; Hagiwara, K; Harada, M; Hino, Y; Horai, T; Ishino, H; Ito, S; Kitagawa, H; Koshio, Y; Ma, W; Nakanishi, F; Piplani, N; Sakai, S; Sakuda, M; Tada, T; Tano, T; Xu, C; Yamaguchi, R; Ishizuka, T; Kuno, Y; Barr, G; Barrow, D; Cook, L; Samani, S; Simpson, C; Wark, D; Holin, AM; Nova, F; Jung, S; Yang, B; Yang, JY; Yoo, J; Fannon, JEP; Kneale, L; Malek, M; McElwee, JM; Stone, O; Thiesse, MD; Thompson, LF; Wilson, ST; Okazawa, H; Lakshmi, SM; Choi, Y; Kim, SB; Kwon, E; Seo, JW; Yu, I; Ichikawa, AK; Nakamura, K; Tairafune, S; Nishijima, K; Eguchi, A; Iwamoto, K; Nakagiri, K; Nakajima, Y; Ogawa, N; Shima, S; Watanabe, E; Yokoyama, M; Calland, RG; Fujita, S; Jesús-Valls, C; Xia, J; Ming, TK; de Perio, P; Martens, K; Murdoch, M; Vagins, MR; Izumiyama, S; Kuze, M; Matsumoto, R; Okajima, Y; Tanaka, M; Yoshida, T; Inomoto, M; Ishitsuka, M; Ito, H; Kinoshita, T; Matsumoto, R; Ohta, K; Ommura, Y; Shinoki, M; Shigeta, N; Suganuma, T; Yamauchi, K; Yoshida, T; Martin, JF; Nantais, CM; Tanaka, HA; Towstego, T; Gaur, R; Gousy-Leblanc, V; Hartz, M; Konaka, A; Li, X; Chen, S; Xu, BD; Zhang, B; Berkman, S; Posiadala-Zezula, M; Boyd, SB; Edwards, R; Hadley, D; Nicholson, M; O'Flaherty, M; Richards, B; Ali, A; Jamieson, B; Walker, J; Amanai, S; Marti, L; Minamino, A; Okamoto, K; Pintaudi, G; Sano, S; Sasaki, R; Suzuki, S; Wada, K

PHYSICAL REVIEW D Vol. 109 ( 9 ) 2024.5

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Language：English Publishing type：Research paper (scientific journal) Publisher：Physical Review D

An analysis of solar neutrino data from the fourth phase of Super-Kamiokande (SK-IV) from October 2008 to May 2018 is performed and the results are presented. The observation time of the dataset of SK-IV corresponds to 2970 days and the total live time for all four phases is 5805 days. For more precise solar neutrino measurements, several improvements are applied in this analysis: lowering the data acquisition threshold in May 2015, further reduction of the spallation background using neutron clustering events, precise energy reconstruction considering the time variation of the PMT gain. The observed number of solar neutrino events in 3.49-19.49 MeV electron kinetic energy region during SK-IV is 65,443-388+390(stat.)±925(syst.) events. Corresponding B8 solar neutrino flux is (2.314±0.014(stat.)±0.040(syst.))×106 cm-2 s-1, assuming a pure electron-neutrino flavor component without neutrino oscillations. The flux combined with all SK phases up to SK-IV is (2.336±0.011(stat.)±0.043(syst.))×106 cm-2 s-1. Based on the neutrino oscillation analysis from all solar experiments, including the SK 5805 days dataset, the best-fit neutrino oscillation parameters are sin2θ12,solar=0.306±0.013 and Δm21,solar2=(6.10-0.81+0.95)×10-5 eV2, with a deviation of about 1.5σ from the Δm212 parameter obtained by KamLAND. The best-fit neutrino oscillation parameters obtained from all solar experiments and KamLAND are sin2θ12,global=0.307±0.012 and Δm21,global2=(7.50-0.18+0.19)×10-5 eV2.

DOI： 10.1103/PhysRevD.109.092001

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Atmospheric neutrino oscillation analysis with neutron tagging and an expanded fiducial volume in Super-Kamiokande I-V Reviewed International coauthorship International journal

Wester, T; Abe, K; Bronner, C; Hayato, Y; Hiraide, K; Hosokawa, K; Ieki, K; Ikeda, M; Kameda, J; Kanemura, Y; Kaneshima, R; Kashiwagi, Y; Kataoka, Y; Miki, S; Mine, S; Miura, M; Moriyama, S; Nakano, Y; Nakahata, M; Nakayama, S; Noguchi, Y; Sato, K; Sekiya, H; Shiba, H; Shimizu, K; Shiozawa, M; Sonoda, Y; Suzuki, Y; Takeda, A; Takemoto, Y; Tanaka, H; Yano, T; Han, S; Kajita, T; Okumura, K; Tashiro, T; Tomiya, T; Wang, X; Yoshida, S; Fernandez, P; Labarga, L; Ospina, N; Zaldivar, B; Pointon, BW; Kearns, E; Raaf, JL; Wan, L; Bian, J; Griskevich, NJ; Locke, S; Smy, MB; Sobel, HW; Takhistov, V; Yankelevich, A; Hill, J; Lee, SH; Moon, DH; Park, RG; Bodur, B; Scholberg, K; Walter, CW; Beauchêne, A; Drapier, O; Giampaolo, A; Mueller, TA; Santos, AD; Paganini, P; Quilain, B; Nakamura, T; Jang, JS; Machado, LN; Learned, JG; Choi, K; Iovine, N; Cao, S; Anthony, LHV; Martin, D; Prouse, NW; Scott, M; Sztuc, AA; Uchida, Y; Berardi, V; Catanesi, MG; Radicioni, E; Calabria, NF; Langella, A; De Rosa, G; Collazuol, G; Iacob, F; Mattiazzi, M; Ludovici, L; Gonin, M; Pronost, G; Fujisawa, C; Maekawa, Y; Nishimura, Y; Okazaki, R; Akutsu, R; Friend, M; Hasegawa, T; Ishida, T; Kobayashi, T; Jakkapu, M; Matsubara, T; Nakadaira, T; Nakamura, K; Oyama, Y; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Bhuiyan, N; Burton, GT; Di Lodovico, F; Gao, J; Goldsack, A; Katori, T; Migenda, J; Ramsden, R; Xie, Z; Zsoldos, S; Suzuki, AT; Takagi, Y; Takeuchi, Y; Zhong, H; Feng, J; Feng, L; Hu, JR; Hu, Z; Kawaue, M; Kikawa, T; Mori, M; Nakaya, T; Wendell, RA; Yasutome, K; Jenkins, SJ; McCauley, N; Mehta, P; Tarrant, A; Fukuda, Y; Itow, Y; Menjo, H; Ninomiya, K; Lagoda, J; Lakshmi, SM; Mandal, M; Mijakowski, P; Prabhu, YS; Zalipska, J; Jia, M; Jiang, J; Jung, CK; Shi, W; Wilking, MJ; Yanagisawa, C; Harada, M; Hino, Y; Ishino, H; Koshio, Y; Nakanishi, F; Sakai, S; Tada, T; Tano, T; Ishizuka, T; Barr, G; Barrow, D; Cook, L; Holin, A; Nova, F; Samani, S; Wark, D; Jung, S; Yang, BS; Yang, JY; Yoo, J; Fannon, JEP; Kneale, L; Malek, M; McElwee, JM; Thiesse, MD; Thompson, LF; Wilson, ST; Okazawa, H; Kim, SB; Kwon, E; Seo, JW; Yu, I; Ichikawa, AK; Nakamura, KD; Tairafune, S; Nishijima, K; Eguchi, A; Nakagiri, K; Nakajima, Y; Shima, S; Taniuchi, N; Watanabe, E; Yokoyama, M; de Perio, P; Fujita, S; Martens, K; Tsui, KM; Vagins, MR; Xia, J; Izumiyama, S; Kuze, M; Matsumoto, R; Ishitsuka, M; Ito, H; Ommura, Y; Shigeta, N; Shinoki, M; Yamauchi, K; Yoshida, T; Gaur, R; Gousy-Leblanc, V; Hartz, M; Konaka, A; Li, X; Chen, S; Xu, BD; Zhang, B; Posiadala-Zezula, M; Boyd, SB; Edwards, R; Hadley, D; Nicholson, M; O'Flaherty, M; Richards, B; Ali, A; Jamieson, B; Amanai, S; Marti, L; Minamino, A; Suzuki, S

PHYSICAL REVIEW D Vol. 109 ( 7 ) 2024.4

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Language：English Publishing type：Research paper (scientific journal) Publisher：Physical Review D

We present a measurement of neutrino oscillation parameters with the Super-Kamiokande detector using atmospheric neutrinos from the complete pure-water SK I-V (April 1996-July 2020) dataset, including events from an expanded fiducial volume. The dataset corresponds to 6511.3 live days and an exposure of 484.2 kiloton-years. Measurements of the neutrino oscillation parameters Δm322, sin2θ23, sin2θ13, δCP, and the preference for the neutrino mass ordering are presented with atmospheric neutrino data alone, and with constraints on sin2θ13 from reactor neutrino experiments. Our analysis including constraints on sin2θ13 favors the normal mass ordering at the 92.3% level.

DOI： 10.1103/PhysRevD.109.072014

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Measurement of the transverse single-spin asymmetry for forward neutron production in a wide pT range in polarized p plus p collisions at √s =510 GeV Reviewed International coauthorship International journal Open Access

Kim, MH; Adriani, O; Berti, E; Bonechi, L; D'Alessandro, R; Goto, Y; Hong, B; Itow, Y; Kasahara, K; Kim, Y; Lee, JH; Lee, SH; Ljubicic, T; Menjo, H; Mitsuka, G; Nakagawa, I; Ogawa, A; Oh, S; Sako, T; Sakurai, N; Sato, K; Seidl, R; Tanida, K; Torii, S; Tricomi, A

PHYSICAL REVIEW D Vol. 109 ( 1 ) 2024.1

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Language：English Publishing type：Research paper (scientific journal) Publisher：Physical Review D

Transverse single-spin asymmetries AN of forward neutrons at pseudorapidities larger than 6 had only been studied in the transverse momentum range of pT<0.4 GeV/c. The RHICf Collaboration has extended the previous measurements up to 1.0 GeV/c in polarized p+p collisions at s=510 GeV, using an electromagnetic calorimeter installed in the zero-degree area of the STAR detector at the Relativistic Heavy Ion Collider. The resulting AN values increase in magnitude with pT in the high longitudinal momentum fraction xF range, but they reach a plateau at lower pT for lower xF values. For low transverse momenta, the AN's show little xF dependence and level off from intermediate values. For higher transverse momenta, the AN's also show a tendency to reach a plateau at increased magnitudes. The results are consistent with previous measurements at lower collision energies, suggesting no s dependence of the neutron asymmetries. A theoretical model based on the interference of π and a1 exchange between two protons could partially reproduce the current results; however, an additional mechanism is necessary to describe the neutron AN's over the whole kinematic region measured.

DOI： 10.1103/PhysRevD.109.012003

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Measurement of the neutrino-oxygen neutral-current quasielastic cross section using atmospheric neutrinos in the SK-Gd experiment Reviewed International coauthorship International journal

Sakai, S; Abe, K; Bronner, C; Hayato, Y; Hiraide, K; Hosokawa, K; Ieki, K; Ikeda, M; Kameda, J; Kanemura, Y; Kaneshima, R; Kashiwagi, Y; Kataoka, Y; Miki, S; Mine, S; Miura, M; Moriyama, S; Nakano, Y; Nakahata, M; Nakayama, S; Noguchi, Y; Sato, K; Sekiya, H; Shiba, H; Shimizu, K; Shiozawa, M; Sonoda, Y; Suzuki, Y; Takeda, A; Takemoto, Y; Tanaka, H; Yano, T; Han, S; Kajita, T; Okumura, K; Tashiro, T; Tomiya, T; Wang, X; Yoshida, S; Fernandez, P; Labarga, L; Ospina, N; Zaldivar, B; Pointon, BW; Kearns, E; Raaf, JL; Wan, L; Wester, T; Bian, J; Griskevich, NJ; Locke, S; Smy, MB; Sobel, HW; Takhistov, V; Yankelevich, A; Hill, J; Jang, MC; Lee, SH; Moon, DH; Park, RG; Bodur, B; Scholberg, K; Walter, CW; Beauchêne, A; Drapier, O; Giampaolo, A; Mueller, TA; Santos, AD; Paganini, P; Quilain, B; Nakamura, T; Jang, JS; Machado, LN; Learned, JG; Choi, K; Iovine, N; Cao, S; Anthony, LHV; Martin, D; Prouse, NW; Scott, M; Sztuc, AA; Uchida, Y; Berardi, V; Calabria, NF; Catanesi, MG; Radicioni, E; Langella, A; De Rosa, G; Collazuol, G; Iacob, F; Mattiazzi, M; Ludovici, L; Gonin, M; Pronost, G; Fujisawa, C; Maekawa, Y; Nishimura, Y; Okazaki, R; Akutsu, R; Friend, M; Hasegawa, T; Ishida, T; Kobayashi, T; Jakkapu, M; Matsubara, T; Nakadaira, T; Nakamura, K; Oyama, Y; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Bhuiyan, N; Burton, GT; Di Lodovico, F; Gao, J; Goldsack, A; Katori, T; Migenda, J; Ramsden, RM; Xie, Z; Zsoldos, S; Suzuki, AT; Takagi, Y; Zhong, H; Takeuchi, Y; Feng, J; Feng, L; Hu, JR; Hu, Z; Kawaue, M; Kikawa, T; Mori, M; Nakaya, T; Wendell, RA; Yasutome, K; Jenkins, SJ; McCauley, N; Mehta, P; Tarant, A; Fukuda, Y; Itow, Y; Menjo, H; Ninomiya, K; Yoshioka, Y; Lagoda, J; Lakshmi, SM; Mandal, M; Mijakowski, P; Prabhu, YS; Zalipska, J; Jia, M; Jiang, J; Jung, CK; Shi, W; Wilking, MJ; Yanagisawa, C; Harada, M; Hino, Y; Ishino, H; Koshio, Y; Nakanishi, F; Tada, T; Tano, T; Ishizuka, T; Barr, G; Barrow, D; Cook, L; Samani, S; Wark, D; Holin, A; Nova, F; Jung, S; Yang, BS; Yang, JY; Yoo, J; Fannon, JEP; Kneale, L; Malek, M; McElwee, JM; Thiesse, MD; Thompson, LF; Wilson, ST; Okazawa, H; Kim, SB; Kwon, E; Seo, JW; Yu, I; Ichikawa, AK; Nakamura, KD; Tairafune, S; Nishijima, K; Eguchi, A; Nakagiri, K; Nakajima, Y; Shima, S; Taniuchi, N; Watanabe, E; Yokoyama, M; de Perio, P; Fujita, S; Martens, K; Tsui, KM; Vagins, MR; Xia, J; Izumiyama, S; Kuze, M; Matsumoto, R; Ishitsuka, M; Ito, H; Ommura, Y; Shigeta, N; Shinoki, M; Yamauchi, K; Yoshida, T; Gaur, R; Gousy-Leblanc, V; Hartz, M; Konaka, A; Li, X; Chen, S; Xu, BD; Zhang, B; Posiadala-Zezula, M; Boyd, SB; Edwards, R; Hadley, D; Nicholson, M; O'Flaherty, M; Richards, B; Ali, A; Jamieson, B; Amanai, S; Marti, L; Minamino, A; Suzuki, S

PHYSICAL REVIEW D Vol. 109 ( 1 ) 2024.1

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Language：English Publishing type：Research paper (scientific journal) Publisher：Physical Review D

We report the first measurement of the atmospheric neutrino-oxygen neutral-current quasielastic (NCQE) cross section in the gadolinium-loaded Super-Kamiokande (SK) water Cherenkov detector. In June 2020, SK began a new experimental phase, named SK-Gd, by loading 0.011% by mass of gadolinium into the ultrapure water of the SK detector. The introduction of gadolinium to ultrapure water has the effect of improving the neutron-tagging efficiency. Using a 552.2 day dataset from August 2020 to June 2022, we measure the NCQE cross section to be 0.74±0.22(stat)-0.15+0.85(syst)×10-38 cm2/oxygen in the energy range from 160 MeV to 10 GeV, which is consistent with the atmospheric neutrino-flux-averaged theoretical NCQE cross section and the measurement in the SK pure-water phase within the uncertainties. Furthermore, we compare the models of the nucleon-nucleus interactions in water and find that the binary cascade model and the Liège intranuclear cascade model provide a somewhat better fit to the observed data than the Bertini cascade model. Since the atmospheric neutrino-oxygen NCQE reactions are one of the main backgrounds in the search for diffuse supernova neutrino background (DSNB), these new results will contribute to future studies - and the potential discovery - of the DSNB in SK.

DOI： 10.1103/PhysRevD.109.L011101

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Measurement of the forwardηmeson production rate in p-p collisions at√s=13TeV with the LHCf-Arm2detector Reviewed International coauthorship International journal Open Access

Adriani, O; Berti, E; Betti, P; Bonechi, L; Bongi, M; D'Alessandro, R; Detti, S; Hagenauer, M; Itow, Y; Kasahara, K; Kitagami, Y; Kondo, M; Matsubara, Y; Menjo, H; Muraki, Y; Ohashi, K; Papini, P; Piparo, G; Ricciarini, S; Sako, T; Sakurai, N; Scaringella, M; Shimizu, Y; Tamura, T; Tiberio, A; Torii, S; Tricomi, A; Turner, WC; Yoshida, K

JOURNAL OF HIGH ENERGY PHYSICS Vol. 2023 ( 10 ) 2023.10

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Language：English Publishing type：Research paper (scientific journal) Publisher：Journal of High Energy Physics

The forward η mesons production has been observed by the Large Hadron Collider forward (LHCf) experiment in proton-proton collision at s = 13 TeV. This paper presents the measurement of the inclusive production rate of η in p<inf>T</inf> < 1.1 GeV/c, expressed as a function of the Feynman-x variable. These results are compared with the predictions of several hadronic interaction models commonly used for the modelling of the air showers produced by ultra-high energy cosmic rays. This is both the first measurement of η mesons from LHCf and the first time a particle containing strange quarks has been observed in the forward region for high-energy collisions. These results will provide a powerful constraint on hadronic interaction models for the purpose of improving the understanding of the processes underlying the air showers produced in the Earth’s atmosphere by ultra-energetic cosmic rays.

DOI： 10.1007/JHEP10(2023)169

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Search for Astrophysical Electron Antineutrinos in Super-Kamiokande with 0.01% Gadolinium-loaded Water Reviewed International coauthorship International journal Open Access

Harada, M; Abe, K; Bronner, C; Hayato, Y; Hiraide, K; Hosokawa, K; Ieki, K; Ikeda, M; Kameda, J; Kanemura, Y; Kaneshima, R; Kashiwagi, Y; Kataoka, Y; Miki, S; Mine, S; Miura, M; Moriyama, S; Nakano, Y; Nakahata, M; Nakayama, S; Noguchi, Y; Okamoto, K; Sato, K; Sekiya, H; Shiba, H; Shimizu, K; Shiozawa, M; Sonoda, Y; Suzuki, Y; Takeda, A; Takemoto, Y; Takenaka, A; Tanaka, H; Watanabe, S; Yano, T; Han, S; Kajita, T; Okumura, K; Tashiro, T; Tomiya, T; Wang, X; Yoshida, S; Megias, GD; Fernandez, P; Labarga, L; Ospina, N; Zaldivar, B; Pointon, BW; Kearns, E; Raaf, JL; Wester, T; Bian, J; Griskevich, NJ; Locke, S; Smy, MB; Sobel, HW; Takhistov, V; Yankelevich, A; Hill, J; Lee, SH; Moon, DH; Park, RG; Bodur, B; Scholberg, K; Walter, CW; Beauchêne, A; Drapier, O; Giampaolo, A; Mueller, TA; Santos, AD; Paganini, P; Quilain, B; Ishizuka, T; Nakamura, T; Jang, JS; Learned, JG; Choi, K; Iovine, N; Cao, S; Anthony, LHV; Martin, D; Scott, M; Sztuc, AA; Uchida, Y; Berardi, V; Catanesi, MG; Radicioni, E; Calabria, NF; Langella, A; Machado, LN; De Rosa, G; Collazuol, G; Iacob, F; Lamoureux, M; Mattiazzi, M; Ludovici, L; Gonin, M; Pronost, G; Fujisawa, C; Maekawa, Y; Nishimura, Y; Okazaki, R; Akutsu, R; Friend, M; Hasegawa, T; Ishida, T; Kobayashi, T; Jakkapu, M; Matsubara, T; Nakadaira, T; Nakamura, K; Oyama, Y; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Bhuiyan, N; Burton, GT; Di Lodovico, F; Gao, J; Goldsack, A; Katori, T; Migenda, J; Xie, Z; Zsoldos, S; Kotsar, Y; Ozaki, H; Suzuki, AT; Takagi, Y; Takeuchi, Y; Feng, J; Feng, L; Hu, JR; Hu, Z; Kikawa, T; Mori, M; Nakaya, T; Wendell, RA; Yasutome, K; Jenkins, SJ; McCauley, N; Mehta, P; Tarrant, A; Fukuda, Y; Itow, Y; Menjo, H; Ninomiya, K; Lagoda, J; Lakshmi, SM; Mandal, M; Mijakowski, P; Prabhu, YS; Zalipska, J; Jia, M; Jiang, J; Jung, CK; Wilking, MJ; Yanagisawa, C; Hino, Y; Ishino, H; Kitagawa, H; Koshio, Y; Nakanishi, F; Sakai, S; Tada, T; Tano, T; Barr, G; Barrow, D; Cook, L; Samani, S; Wark, D; Holin, A; Nova, F; Yang, BS; Yang, JY; Yoo, J; Fannon, JEP; Kneale, L; Malek, M; McElwee, JM; Thiesse, MD; Thompson, LF; Wilson, ST; Okazawa, H; Kim, SB; Kwon, E; Seo, JW; Yu, I; Ichikawa, AK; Nakamura, KD; Tairafune, S; Nishijima, K; Nakagiri, K; Nakajima, Y; Shima, S; Taniuchi, N; Watanabe, E; Yokoyama, M; de Perio, P; Martens, K; Tsui, KM; Vagins, MR; Xia, J; Kuze, M; Izumiyama, S; Matsumoto, R; Ishitsuka, M; Ito, H; Kinoshita, T; Matsumoto, R; Ommura, Y; Shigeta, N; Shinoki, M; Suganuma, T; Yamauchi, K; Martin, JF; Tanaka, HA; Towstego, T; Gaur, R; Gousy-Leblanc, V; Hartz, M; Konaka, A; Li, X; Prouse, NW; Chen, S; Xu, BD; Zhang, B; Posiadala-Zezula, M; Boyd, SB; Edwards, R; Hadley, D; Nicholson, M; O'Flaherty, M; Richards, B; Ali, A; Jamieson, B; Marti, L; Minamino, A; Pintaudi, G; Sano, S; Suzuki, S; Wada, K

ASTROPHYSICAL JOURNAL LETTERS Vol. 951 ( 2 ) 2023.7

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Language：English Publishing type：Research paper (scientific journal) Publisher：Astrophysical Journal Letters

We report the first search result for the flux of astrophysical electron antineutrinos for energies(10)MeV in the gadolinium-loaded Super-Kamiokande (SK) detector. In 2020 June, gadolinium was introduced to the ultrapure water of the SK detector in order to detect neutrons more efficiently. In this new experimental phase, SK-Gd, we can search for electron antineutrinos via inverse beta decay with efficient background rejection thanks to the high efficiency of the neutron tagging technique. In this paper, we report the result for the initial stage of SK-Gd, during 2020 August 26, and 2022 June 1 with a 22.5 × 552 kton · day exposure at 0.01% Gd mass concentration. No significant excess over the expected background in the observed events is found for the neutrino energies below 31.3 MeV. Thus, the flux upper limits are placed at the 90% confidence level. The limits and sensitivities are already comparable with the previous SK result with pure water (22.5 × 2970 kton · day) owing to the enhanced neutron tagging. Operation with Gd increased to 0.03% started in 2022 June.

DOI： 10.3847/2041-8213/acdc9e

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Measurement of the cosmogenic neutron yield in Super-Kamiokande with gadolinium loaded water Reviewed International coauthorship International journal Open Access

Shinoki, M; Abe, K; Hayato, Y; Hiraide, K; Hosokawa, K; Ieki, K; Ikeda, M; Kameda, J; Kanemura, Y; Kaneshima, R; Kashiwagi, Y; Kataoka, Y; Miki, S; Mine, S; Miura, M; Moriyama, S; Nakano, Y; Nakahata, M; Nakayama, S; Noguchi, Y; Okamoto, K; Sato, K; Sekiya, H; Shiba, H; Shimizu, K; Shiozawa, M; Sonoda, Y; Suzuki, Y; Takeda, A; Takemoto, Y; Takenaka, A; Tanaka, H; Watanabe, S; Yano, T; Han, S; Kajita, T; Okumura, K; Tashiro, T; Tomiya, T; Wang, X; Yoshida, S; Megias, GD; Fernandez, P; Labarga, L; Ospina, N; Zaldivar, B; Pointon, BW; Kearns, E; Raaf, JL; Wan, L; Wester, T; Bian, J; Griskevich, NJ; Kropp, WR; Locke, S; Smy, MB; Sobel, HW; Takhistov, V; Yankelevich, A; Hill, J; Lee, SH; Moon, DH; Park, RG; Bodur, B; Scholberg, K; Walter, CW; Beauchêne, A; Bernard, L; Coffani, A; Drapier, O; El Hedri, S; Giampaolo, A; Mueller, TA; Santos, AD; Paganini, P; Quilain, B; Ishizuka, T; Nakamura, T; Jang, JS; Learned, JG; Choi, K; Cao, S; Anthony, LHV; Martin, D; Scott, M; Sztuc, AA; Uchida, Y; Berardi, V; Catanesi, MG; Radicioni, E; Calabria, NF; Langella, A; Machado, LN; De Rosa, G; Collazuol, G; Iacob, F; Lamoureux, M; Mattiazzi, M; Ludovici, L; Gonin, M; Pronost, G; Fujisawa, C; Maekawa, Y; Nishimura, Y; Akutsu, R; Friend, M; Hasegawa, T; Ishida, T; Kobayashi, T; Jakkapu, M; Matsubara, T; Nakadaira, T; Nakamura, K; Oyama, Y; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Bhuiyan, N; Boschi, T; Burton, GT; Di Lodovico, F; Gao, J; Goldsack, A; Katori, T; Migenda, J; Taani, M; Xie, Z; Zsoldos, S; Kotsar, Y; Ozaki, H; Suzuki, AT; Takeuchi, Y; Bronner, C; Feng, J; Kikawa, T; Mori, M; Nakaya, T; Wendell, RA; Yasutome, K; Jenkins, SJ; McCauley, N; Mehta, P; Tarrant, A; Tsui, KM; Fukuda, Y; Itow, Y; Menjo, H; Ninomiya, K; Lagoda, J; Lakshmi, SM; Mandal, M; Mijakowski, P; Prabhu, YS; Zalipska, J; Jia, M; Jiang, J; Jung, CK; Wilking, MJ; Yanagisawa, C; Harada, M; Ishino, H; Ito, S; Kitagawa, H; Koshio, Y; Nakanish, F; Sakai, S; Barr, G; Barrow, D; Cook, L; Samani, S; Wark, D; Holin, A; Nova, F; Yang, JY; Yang, BS; Yoo, J; Fannon, JEP; Kneale, L; Malek, M; McElwee, JM; Stone, O; Thiesse, MD; Thompson, LF; Okazawa, H; Kim, SB; Kwon, E; Seo, JW; Yu, I; Ichikawa, AK; Nakamura, KD; Tairafune, S; Nishijima, K; Koshiba, M; Iwamoto, K; Nakagiri, K; Nakajima, Y; Shima, S; Taniuchi, N; Yokoyama, M; Martens, K; de Perio, P; Vagins, MR; Xia, J; Kuze, M; Izumiyama, S; Inomoto, M; Ishitsuka, M; Ito, H; Kinoshita, T; Matsumoto, R; Ommura, Y; Shigeta, N; Suganuma, T; Yamauchi, K; Martin, JF; Tanaka, HA; Towstego, T; Gaur, R; Gousy-Leblanc, V; Hartz, M; Konaka, A; Li, X; Prouse, NW; Chen, S; Xu, BD; Zhang, B; Posiadala-Zezula, M; Boyd, SB; Hadley, D; Nicholson, M; O'Flaherty, M; Richards, B; Ali, A; Jamieson, B; Marti, L; Minamino, A; Pintaudi, G; Sano, S; Suzuki, S; Wada, K

PHYSICAL REVIEW D Vol. 107 ( 9 ) 2023.5

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Language：English Publishing type：Research paper (scientific journal) Publisher：Physical Review D

Cosmic-ray muons that enter the Super-Kamiokande detector cause hadronic showers due to spallation in water, producing neutrons and radioactive isotopes. These are a major background source for studies of MeV-scale neutrinos and searches for rare events. In 2020, gadolinium was introduced into the ultra-pure water in the Super-Kamiokande detector to improve the detection efficiency of neutrons. In this study, the cosmogenic neutron yield was measured using data acquired during the period after the gadolinium loading. The yield was found to be (2.76±0.02(stat)±0.19(syst))×10-4 μ-1 g-1 cm2 at an average muon energy 259 GeV at the Super-Kamiokande detector.

DOI： 10.1103/PhysRevD.107.092009

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Search for Cosmic-Ray Boosted Sub-GeV Dark Matter Using Recoil Protons at Super-Kamiokande Reviewed International coauthorship International journal Open Access

K. Abe et al. (The Super-Kamiokande Collaboration)

Physical Review Letters Vol. 130 ( 3 ) page： 031802 2023.1

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1103/PhysRevLett.130.031802

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PubMed

Other Link： https://arxiv.org/abs/2209.14968
LHCf Run II physics results in proton-proton collisions at √s = 13 TeV Invited International coauthorship Open Access

A. Tiberio et al.

Proceedings of Science Vol. 414 page： 121 2022.11

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Language：English Publishing type：Research paper (international conference proceedings)

DOI： 10.22323/1.414.0121

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Search for proton decay via p → μ+ K0 in 0.37 megaton-years exposure of Super-Kamiokande Reviewed International coauthorship International journal Open Access

Matsumoto, R; Abe, K; Hayato, Y; Hiraide, K; Ieki, K; Ikeda, M; Kameda, J; Kanemura, Y; Kaneshima, R; Kashiwagi, Y; Kataoka, Y; Miki, S; Mine, S; Miura, M; Moriyama, S; Nakano, Y; Nakahata, M; Nakayama, S; Noguchi, Y; Okamoto, K; Sato, K; Sekiya, H; Shiba, H; Shimizu, K; Shiozawa, M; Sonoda, Y; Suzuki, Y; Takeda, A; Takemoto, Y; Takenaka, A; Tanaka, H; Watanabe, S; Yano, T; Han, S; Kajita, T; Okumura, K; Tashiro, T; Tomiya, T; Wang, X; Xia, J; Yoshida, S; Megias, GD; Fernandez, P; Labarga, L; Ospina, N; Zaldivar, B; Pointon, BW; Kearns, E; Raaf, JL; Wan, L; Wester, T; Bian, J; Griskevich, NJ; Kropp, WR; Locke, S; Smy, MB; Sobel, HW; Takhistov, ; Yankelevich, A; Hill, J; Kim, JY; Lim, IT; Park, RG; Bodur, B; Scholberg, K; Walter, CW; Bernard, L; Coffani, A; Drapier, O; El Hedri, S; Giampaolo, A; Mueller, TA; Santos, AD; Paganini, P; Quilain, B; Ishizuka, T; Nakamura, T; Jang, JS; Learned, JG; Choi, K; Cao, S; Anthony, LH; Martin, D; Scott, M; Sztuc, AA; Uchida, Y; Berardi, ; Catanesi, MG; Radicioni, E; Calabria, NF; Machado, LN; De Rosa, G; Collazuol, G; Iacob, F; Lamoureux, M; Mattiazzi, M; Ludovici, L; Gonin, M; Pronost, G; Fujisawa, C; Maekawa, Y; Nishimura, Y; Friend, M; Hasegawa, T; Ishida, T; Kobayashi, T; Jakkapu, M; Matsubara, T; Nakadaira, T; Nakamura, K; Oyama, Y; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Boschi, T; Di Lodovico, F; Gao, J; Goldsack, A; Katori, T; Migenda, J; Taani, M; Xie, Z; Zsoldos, S; Kotsar, Y; Ozaki, H; Suzuki, AT; Takeuchi, Y; Yamamoto, S; Bronner, C; Feng, J; Kikawa, T; Mori, M; Nakaya, T; Wendell, RA; Yasutome, K; Jenkins, SJ; McCauley, N; Mehta, P; Tsui, KM; Tarrant, A; Fukuda, Y; Itow, Y; Menjo, H; Ninomiya, K; Lagoda, J; Lakshmi, SM; Mandal, M; Mijakowski, P; Prabhu, YS; Zalipska, J; Jia, M; Jiang, J; Jung, CK; Wilking, MJ; Yanagisawa, C; Harada, M; Ishino, H; Ito, S; Kitagawa, H; Koshio, Y; Ma, W; Nakanishi, F; Sakai, S; Barr, G; Barrow, D; Cook, L; Samani, S; Wark, D; Holin, A; Nova, F; Yang, JY; Malek, M; McElwee, JM; Stone, O; Thiesse, MD; Thompson, LF; Okazawa, H; Kim, SB; Kwon, E; Seo, JW; Yu, ; Ichikawa, AK; Nakamura, KD; Tairafune, S; Nishijima, K; Koshiba, M; Iwamoto, K; Nakagiri, K; Nakajima, Y; Shima, S; Taniuchi, N; Yokoyama, M; Martens, K; de Perio, P; Vagins, MR; Kuze, M; Izumiyama, S; Inomoto, M; Ishitsuka, M; Ito, H; Kinoshita, T; Ommura, Y; Shigeta, N; Shinoki, M; Suganuma, T; Yamauchi, K; Martin, JF; Tanaka, HA; Towstego, T; Akutsu, R; Gousy-Leblanc, ; Hartz, M; Konaka, A; Li, X; Prouse, NW; Chen, S; Xu, BD; Zhang, B; Posiadala-Zezula, M; Boyd, SB; Hadley, D; Nicholson, M; O'Flaherty, M; Richards, B; Ali, A; Jamieson, B; Marti, L; Minamino, A; Pintaudi, G; Sano, S; Suzuki, S; Wada, K

PHYSICAL REVIEW D Vol. 106 ( 7 ) 2022.10

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Language：English Publishing type：Research paper (scientific journal) Publisher：Physical Review D

We searched for proton decay via p→μ+K0 in 0.37 Mton·years of data collected between 1996 and 2018 from the Super-Kamiokande water Cherenkov experiment. The selection criteria were defined separately for KS0 and KL0 channels. No significant event excess has been observed. As a result of this analysis, which extends the previous search by an additional 0.2 Mton·years of exposure and uses an improved event reconstruction, we set a lower limit of 3.6×1033 years on the proton lifetime.

DOI： 10.1103/PhysRevD.106.072003

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Scopus
Searching for Supernova Bursts in Super-Kamiokande IV Reviewed International coauthorship International journal Open Access

Mori, M; Abe, K; Hayato, Y; Hiraide, K; Ieki, K; Ikeda, M; Imaizumi, S; Kameda, J; Kanemura, Y; Kaneshima, R; Kashiwagi, Y; Kataoka, Y; Miki, S; Mine, S; Miura, M; Moriyama, S; Nagao, Y; Nakahata, M; Nakano, Y; Nakayama, S; Noguchi, Y; Okada, T; Okamoto, K; Orii, A; Sato, K; Sekiya, H; Shiba, H; Shimizu, K; Shiozawa, M; Sonoda, Y; Suzuki, Y; Takeda, A; Takemoto, Y; Takenaka, A; Tanaka, H; Tomiya, T; Watanabe, S; Yano, T; Yoshida, S; Han, S; Kajita, T; Okumura, K; Tashiro, T; Wang, X; Xia, J; Megias, GD; Bravo-Berguño, D; Fernandez, P; Labarga, L; Ospina, N; Zaldivar, B; Zsoldos, S; Pointon, BW; Blaszczyk, FDM; Kearns, E; Raaf, JL; Stone, JL; Wan, L; Wester, T; Bian, J; Griskevich, NJ; Kropp, WR; Locke, S; Smy, MB; Sobel, HW; Takhistov, ; Yankelevich, A; Hill, J; Kim, JY; Lim, IT; Park, RG; Bodur, B; Scholberg, K; Walter, CW; Bernard, L; Coffani, A; Drapier, O; El Hedri, S; Giampaolo, A; Mueller, TA; Paganini, P; Quilain, B; Santos, AD; Ishizuka, T; Nakamura, T; Jang, JS; Learned, JG; Anthony, LH; Martin, D; Scott, M; Sztuc, AA; Uchida, Y; Berardi, ; Catanesi, MG; Radicioni, E; Calabria, NF; Machado, LN; De Rosa, G; Collazuol, G; Iacob, F; Lamoureux, M; Mattiazzi, M; Ludovici, L; Gonin, M; Pronost, G; Maekawa, Y; Nishimura, Y; Fujisawa, C; Friend, M; Hasegawa, T; Ishida, T; Kobayashi, T; Jakkapu, M; Matsubara, T; Nakadaira, T; Nakamura, K; Oyama, Y; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Ozaki, H; Shiozawa, T; Suzuki, AT; Takeuchi, Y; Yamamoto, S; Kotsar, Y; Ashida, Y; Bronner, C; Feng, J; Hirota, S; Kikawa, T; Nakaya, T; Wendell, RA; Yasutome, K; McCauley, N; Mehta, P; Tsui, KM; Fukuda, Y; Itow, Y; Menjo, H; Ninomiya, K; Niwa, T; Tsukada, M; Lagoda, J; Lakshmi, SM; Mijakowski, P; Zalipska, J; Mandal, M; Prabhu, YS; Jiang, J; Jung, CK; Vilela, C; Wilking, MJ; Yanagisawa, C; Jia, M; Hagiwara, K; Harada, M; Horai, T; Ishino, H; Ito, S; Kitagawa, H; Koshio, Y; Ma, W; Nakanishi, F; Piplani, N; Sakai, S; Barr, G; Barrow, D; Cook, L; Samani, S; Wark, D; Nova, F; Boschi, T; Gao, J; Goldsack, A; Katori, T; Di Lodovico, F; Migenda, J; Taani, M; Zsoldos, S; Yang, JY; Jenkins, SJ; Malek, M; McElwee, JM; Stone, O; Thiesse, MD; Thompson, LF; Okazawa, H; Kim, SB; Seo, JW; Yu, ; Nishijima, K; Koshiba, M; Nakagiri, K; Nakajima, Y; Iwamoto, K; Taniuchi, N; Yokoyama, M; Martens, K; de Perio, P; Vagins, MR; Kuze, M; Izumiyama, S; Yoshida, T; Inomoto, M; Ishitsuka, M; Ito, H; Kinoshita, T; Matsumoto, R; Ohta, K; Ommura, Y; Shigeta, N; Shinoki, M; Suganuma, T; Yamauchi, K; Martin, JF; Tanaka, HA; Towstego, T; Akutsu, R; Gousy-Leblanc, ; Hartz, M; Konaka, A; Prouse, NW; Chen, S; Xu, BD; Zhang, B; Posiadala-Zezula, M; Hadley, D; Nicholson, M; O'Flaherty, M; Richards, B; Ali, A; Jamieson, B; Walker, J; Marti, L; Minamino, A; Okamoto, K; Pintaudi, G; Sasaki, R; Sano, S; Suzuki, S; Wada, K; Cao, S; Ichikawa, A; Nakamura, KD; Tairafune, S; Choi, K

ASTROPHYSICAL JOURNAL Vol. 938 ( 1 ) 2022.10

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Language：English Publishing type：Research paper (scientific journal) Publisher：Astrophysical Journal

Super-Kamiokande has been searching for neutrino bursts characteristic of core-collapse supernovae continuously, in real time, since the start of operations in 1996. The present work focuses on detecting more distant supernovae whose event rate may be too small to trigger in real time, but may be identified using an offline approach. The analysis of data collected from 2008 to 2018 found no evidence of distant supernovae bursts. This establishes an upper limit of 0.29 yr-1 on the rate of core-collapse supernovae out to 100 kpc at 90% C.L. For supernovae that fail to explode and collapse directly to black holes the limit reaches to 300 kpc.

DOI： 10.3847/1538-4357/ac8f41

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Web of Science

Scopus
Neutron tagging following atmospheric neutrino events in a water Cherenkov detector Reviewed International coauthorship International journal Open Access

Abe, K; Haga, Y; Hayato, Y; Hiraide, K; Ieki, K; Ikeda, M; Imaizumi, S; Iyogi, K; Kameda, J; Kanemura, Y; Kataoka, Y; Kato, Y; Kishimoto, Y; Miki, S; Mine, S; Miura, M; Mochizuki, T; Moriyama, S; Nagao, Y; Nakahata, M; Nakajima, T; Nakano, Y; Nakayama, S; Okada, T; Okamoto, K; Orii, A; Sato, K; Sekiya, H; Shiozawa, M; Sonoda, Y; Suzuki, Y; Takeda, A; Takemoto, Y; Takenaka, A; Tanaka, H; Tasaka, S; Tomura, T; Ueno, K; Watanabe, S; Yano, T; Yokozawa, T; Han, S; Irvine, T; Kajita, T; Kametani, ; Kaneyuki, K; Lee, KP; McLachlan, T; Okumura, K; Richard, E; Tashiro, T; Wang, R; Xia, J; Megias, GD; Bravo-Berguño, D; Labarga, L; Zaldivar, B; Goldhaber, M; Blaszczyk, FDM; Gustafson, J; Kachulis, C; Kearns, E; Raaf, JL; Stone, JL; Sulak, LR; Sussman, S; Wan, L; Wester, T; Pointon, BW; Bian, J; Carminati, G; Elnimr, M; Griskevich, NJ; Kropp, WR; Locke, S; Renshaw, A; Smy, MB; Sobel, HW; Takhistov, ; Weatherly, P; Ganezer, KS; Hartfiel, BL; Hill, J; Keig, WE; Hong, N; Kim, JY; Lim, IT; Park, RG; Akiri, T; Bodur, B; Himmel, A; Li, Z; O'Sullivan, E; Scholberg, K; Walter, CW; Wongjirad, T; Bernard, L; Coffani, A; Drapier, O; El Hedri, S; Giampaolo, A; Imber, J; Mueller, TA; Paganini, P; Quilain, B; Ishizuka, T; Nakamura, T; Jang, JS; Choi, K; Learned, JG; Matsuno, S; Smith, SN; Amey, J; Anthony, LH; Litchfield, RP; Ma, WY; Marin, D; Sztuc, AA; Uchida, Y; Wascko, MO; Berardi, ; Catanesi, MG; Intonti, RA; Radicioni, E; Calabria, NF; De Rosa, G; Machado, LN; Collazuol, G; Iacob, F; Lamoureux, M; Ospina, N; Ludovici, L; Gonin, M; Pronost, G; Maekawa, Y; Nishimura, Y; Cao, S; Friend, M; Hasegawa, T; Ishida, T; Ishii, T; Jakkapu, M; Kobayashi, T; Matsubara, T; Nakadaira, T; Nakamura, K; Oyama, Y; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Boschi, T; Di Lodovico, F; Migenda, J; Sedgwick, SM; Taani, M; Zsoldos, S; Abe, KE; Hasegawa, M; Isobe, Y; Kotsar, Y; Miyabe, H; Ozaki, H; Shiozawa, T; Sugimoto, T; Suzuki, AT; Takeuchi, Y; Yamamoto, S; Ali, A; Ashida, Y; Bronner, C; Feng, J; Hayashino, T; Hiraki, T; Hirota, S; Huang, K; Jiang, M; Kikawa, T; Mori, M; Murakami, A; Nakamura, K; Nakaya, T; Patel, ND; Suzuki, K; Takahashi, S; Tateishi, K; Wendell, RA; Yasutome, K; Fernandez, P; McCauley, N; Mehta, P; Pritchard, A; Tsui, KM; Fukuda, Y; Itow, Y; Menjo, H; Mitsuka, G; Murase, M; Muto, F; Niwa, T; Suzuki, T; Tsukada, M; Frankiewicz, K; Mijakowski, P; Hignight, J; Jiang, J; Jung, CK; Li, X; Palomino, JL; Santucci, G; Vilela, C; Wilking, MJ; Yanagisawa, C; Fukuda, D; Hagiwara, K; Harada, M; Horai, T; Ishino, H; Ito, S; Kayano, T; Kibayashi, A; Kitagawa, H; Koshio, Y; Ma, W; Mori, T; Nagata, H; Piplani, N; Sakai, S; Sakuda, M; Takahira, Y; Xu, C; Yamaguchi, R; Kuno, Y; Barr, G; Barrow, D; Cook, L; Goldsack, A; Samani, S; Simpson, C; Wark, D; Nova, F; Tacik, R; Yang, JY; Cole, A; Jenkins, SJ; Malek, M; McElwee, JM; Stone, O; Thiesse, MD; Thompson, LF; Okazawa, H; Choi, Y; Kim, SB; Yu, ; Ichikawa, AK; Nakamura, K; Ito, K; Nishijima, K; Calland, RG; de Perio, P; Martens, K; Murdoch, M; Vagins, MR; Koshiba, M; Totsuka, Y; Iwamoto, K; Nakajima, Y; Ogawa, N; Suda, Y; Yokoyama, M; Hamabe, D; Izumiyama, S; Kuze, M; Okajima, Y; Tanaka, M; Yoshida, T; Inomoto, M; Ishitsuka, M; Ito, H; Matsumoto, R; Ohta, K; Shinoki, M; Martin, JF; Nantais, CM; Tanaka, HA; Towstego, T; Akutsu, R; Hartz, M; Konaka, A; Prouse, NW; Chen, S; Xu, BD; Zhang, Y; Berkman, S; Tobayama, S; Connolly, K; Wilkes, RJ; Posiadala-Zezula, M; Hadley, D; Richards, B; Jamieson, B; Walker, J; Marti, L; Minamino, A; Okamoto, K; Pintaudi, G; Sano, S; Sasaki, R

JOURNAL OF INSTRUMENTATION Vol. 17 ( 10 ) 2022.10

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1088/1748-0221/17/10/P10029

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Web of Science
Pre-supernova Alert System for Super-Kamiokande Reviewed International coauthorship International journal Open Access

Machado, LN; Abe, K; Hayato, Y; Hiraide, K; Ieki, K; Ikeda, M; Kameda, J; Kanemura, Y; Kaneshima, R; Kashiwagi, Y; Kataoka, Y; Miki, S; Mine, S; Miura, M; Moriyama, S; Nakano, Y; Nakahata, M; Nakayama, S; Noguchi, Y; Okamoto, K; Sato, K; Sekiya, H; Shiba, H; Shimizu, K; Shiozawa, M; Sonoda, Y; Suzuki, Y; Takeda, A; Takemoto, Y; Takenaka, A; Tanaka, H; Watanabe, S; Yano, T; de Perio, P; Martens, K; Vagins, MR; Bian, J; Griskevich, NJ; Kropp, WR; Locke, S; Smy, MB; Sobel, HW; Takhistov, ; Yankelevich, A; Han, S; Kajita, T; Okumura, K; Tashiro, T; Tomiya, T; Wang, X; Xia, J; Yoshida, S; Megias, GD; Fernandez, P; Labarga, L; Ospina, N; Zaldivar, B; Pointon, BW; Akutsu, R; Gousy-Leblanc, ; Hartz, M; Konaka, A; Prouse, NW; Kearns, E; Raaf, JL; Wan, L; Wester, T; Hill, J; Kim, JY; Lim, IT; Park, RG; Bodur, B; Scholberg, K; Walter, CW; Bernard, L; Coffani, A; Drapier, O; El Hedri, S; Giampaolo, A; Mueller, TA; Santos, AD; Paganini, P; Quilain, B; Ishizuka, T; Nakamura, T; Jang, JS; Learned, JG; Cao, S; Choi, K; Anthony, LH; Martin, D; Scott, M; Sztuc, AA; Uchida, Y; Berardi, ; Catanesi, MG; Radicioni, E; Calabria, NF; De Rosa, G; Collazuol, G; Iacob, F; Lamoureux, M; Mattiazzi, M; Ludovici, L; Gonin, M; Pronost, G; Fujisawa, C; Maekawa, Y; Nishimura, Y; Sasaki, R; Friend, M; Hasegawa, T; Ishida, T; Jakkapu, M; Kobayashi, T; Matsubara, T; Nakadaira, T; Nakamura, K; Oyama, Y; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Boschi, T; Di Lodovico, F; Gao, J; Goldsack, A; Katori, T; Migenda, J; Taani, M; Zsoldos, S; Kotsar, Y; Ozaki, H; Suzuki, AT; Takeuchi, Y; Yaamoto, S; Bronner, C; Feng, J; Kikawa, T; Mori, M; Nakaya, T; Wendell, RA; Yasutome, K; Jenkins, SJ; McCauley, N; Mehta, P; Tsui, KM; Fukuda, Y; Itow, Y; Menjo, H; Ninomiya, K; Lagoda, J; Lakshmi, SM; Mandal, M; Mijakowski, P; Prabhu, YS; Zalipska, J; Jia, M; Jiang, J; Jung, CK; Wilking, MJ; Yanagisawa, C; Harada, M; Ishino, H; Ito, S; Kitagawa, H; Koshio, Y; Ma, W; Nakanishi, F; Sakai, S; Barr, G; Barrow, D; Cook, L; Samani, S; Wark, D; Nova, F; Yang, JY; Malek, M; McElwee, JM; Stone, O; Thiesse, MD; Thompson, LF; Okazawa, H; Kim, SB; Seo, JW; Yu, ; Ichikawa, AK; Nakamura, KD; Tairafune, S; Nishijima, K; Iwamoto, K; Nakagiri, K; Nakajima, Y; Taniuchi, N; Yokoyama, M; Izumiyama, S; Kuze, M; Inomoto, M; Ishitsuka, M; Ito, H; Kinoshita, T; Matsumoto, R; Ommura, Y; Shigeta, N; Shinoki, M; Suganuma, T; Yonenaga, M; Martin, JF; Tanaka, HA; Towstego, T; Chen, S; Xu, BD; Zhang, B; Posiadala-Zezula, M; Hadley, D; Nicholson, M; Richards, B; Ali, A; Jamieson, B; Marti, L; Minamino, A; Pintaudi, G; Sano, S; Suzuki, S; Wada, K

ASTROPHYSICAL JOURNAL Vol. 935 ( 1 ) 2022.8

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Language：English Publishing type：Research paper (scientific journal) Publisher：Astrophysical Journal

In 2020, the Super-Kamiokande (SK) experiment moved to a new stage (SK-Gd) in which gadolinium (Gd) sulfate octahydrate was added to the water in the detector, enhancing the efficiency to detect thermal neutrons and consequently improving the sensitivity to low energy electron anti-neutrinos from inverse beta decay (IBD) interactions. SK-Gd has the potential to provide early alerts of incipient core-collapse supernovae through detection of electron anti-neutrinos from thermal and nuclear processes responsible for the cooling of massive stars before the gravitational collapse of their cores. These pre-supernova neutrinos emitted during the silicon burning phase can exceed the energy threshold for IBD reactions. We present the sensitivity of SK-Gd to pre-supernova stars and the techniques used for the development of a pre-supernova alarm based on the detection of these neutrinos in SK, as well as prospects for future SK-Gd phases with higher concentrations of Gd. For the current SK-Gd phase, high-confidence alerts for Betelgeuse could be issued up to 9 hr in advance of the core collapse itself.

DOI： 10.3847/1538-4357/ac7f9c

Open Access

Web of Science

Scopus
Search for solar electron anti-neutrinos due to spin-flavor precession in the Sun with Super-Kamiokande-IV Reviewed International coauthorship International journal Open Access

Abe K., Bronner C., Hayato Y., Ikeda M., Imaizumi S., Ito H., Kameda J., Kataoka Y., Miura M., Moriyama S., Nagao Y., Nakahata M., Nakajima Y., Nakayama S., Okada T., Okamoto K., Orii A., Pronost G., Sekiya H., Shiozawa M., Sonoda Y., Suzuki Y., Takeda A., Takemoto Y., Takenaka A., Tanaka H., Yano T., Akutsu R., Han S., Kajita T., Okumura K., Tashiro T., Wang R., Xia J., Bravo-Berguño D., Labarga L., Marti L., Zaldivar B., Blaszczyk F.D.M., Kearns E., Raaf J.L., Stone J.L., Wan L., Wester T., Pointon B.W., Bian J., Griskevich N.J., Kropp W.R., Locke S., Mine S., Smy M.B., Sobel H.W., Takhistov V., Weatherly P., Hill J., Kim J.Y., Lim I.T., Park R.G., Bodur B., Scholberg K., Walter C.W., Bernard L., Coffani A., Drapier O., Hedri S.E., Giampaolo A., Gonin M., Mueller T.A., Paganini P., Quilain B., Ishizuka T., Nakamura T., Jang J.S., Learned J.G., Anthony L.H.V., Sztuc A.A., Uchida Y., Berardi V., Catanesi M.G., Radicioni E., Calabria N.F., Machado L.N., De Rosa G., Collazuol G., Iacob F., Lamoureux M., Ospina N., Ludovici L., Nishimura Y., Cao S., Friend M., Hasegawa T., Ishida T., Jakkapu M., Kobayashi T., Matsubara T., Nakadaira T., Nakamura K., Oyama Y., Sakashita K.

Astroparticle Physics Vol. 139 2022.6

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Language：English Publishing type：Research paper (scientific journal) Publisher：Astroparticle Physics

Due to a very low production rate of electron anti-neutrinos (ν̄<inf>e</inf>) via nuclear fusion in the Sun, a flux of solar ν̄<inf>e</inf> is unexpected. An appearance of ν̄<inf>e</inf> in solar neutrino flux opens a new window for the new physics beyond the standard model. In particular, a spin-flavor precession process is expected to convert an electron neutrino into an electron anti-neutrino (ν<inf>e</inf>→ν̄<inf>e</inf>) when neutrino has a finite magnetic moment. In this work, we have searched for solar ν̄<inf>e</inf> in the Super-Kamiokande experiment, using neutron tagging to identify their inverse beta decay signature. We identified 78 ν̄<inf>e</inf> candidates for neutrino energies of 9.3 to 17.3 MeV in 2970.1 live days with a fiducial volume of 22.5 kiloton water (183.0 kton⋅year exposure). The energy spectrum has been consistent with background predictions and we thus derived a 90% confidence level upper limit of 4.7×10−4 on the ν<inf>e</inf>→ν̄<inf>e</inf> conversion probability in the Sun. We used this result to evaluate the sensitivity of future experiments, notably the Super-Kamiokande Gadolinium (SK-Gd) upgrade.

DOI： 10.1016/j.astropartphys.2022.102702

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COSMOS X as a general purpose air shower simulation tool International journal Open Access

Sako T., Fujii T., Kasahara K., Menjo H., Sakaki N., Sakurai N., Taketa A., Tameda Y.

Proceedings of Science Vol. 395 2022.3

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：Proceedings of Science

An air shower simulation package COSMOS was born in 1970's and has been continuously developed. A recent major update enables particle tracking not only in the atmosphere but also in arbitrary gas, liquid and solid materials by combining with the EPICS detector simulation package. This paper describes the properties of this extended version of COSMOS, namely COSMOS X. Combination of gas, liquid and solid materials in spherical shells with a common center can be defined as environment. Users can also arbitrary define the electric and magnetic fields. These features allow shower simulations even in the soil, concrete, sea and ice. Also simulations at the Sun and the Mars are possible applications. Flexible input/output control since the previous versions of COSMOS, a set of user hook functions, is also available. In the predefined user functions, information of each particle in transportation can be easily accessed and users can extract information from them. General introduction to COSMOS and new functions of COSMOS X together with some interesting application cases will be presented in this paper.

DOI： 10.22323/1.395.0431

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Very-forward π0 production cross section in proton-proton collisions at √s = 13 TeV measured with the LHCf experiment International coauthorship International journal Open Access

Tiberio A., Adriani O., Berti E., Bonechi L., Bongi M., D’Alessandro R., Castellini G., Haguenauer M., Itow Y., Kasahara K., Kondo M., Matsubara Y., Menjo H., Muraki Y., Ohashi K., Papini P., Ricciarini S., Sako T., Sakurai N., Sato K., Shimizu Y., Tamura T., Torii S., Tricomi A., Turner W.C., Ueno M., Yoshida K.

Proceedings of Science Vol. 395 2022.3

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：Proceedings of Science

The LHCf experiment, situated at the LHC accelerator, is composed of two independent detectors located at 140 metres from the ATLAS interaction point (IP1) on opposite sides along the beam axis. LHCf covers the pseudorapidity region above 8.4, with the capability to measure zero-degree neutral particles. The physics motivation of the experiment is to test the hadronic interaction models commonly used in ground-based cosmic rays experiments to simulate air-showers induced by ultra-high-energy cosmic rays (UHECR) in the Earth atmosphere. The data from accelerator experiments are very important for the tuning of these phenomenological models in order to reduce the systematic uncertainty of UHECR measurements. A precise measurement of the π0s produced in the very-forward region in high energy collisions provides the possibility to study the electromagnetic component of secondary particles produced in the first interaction of a UHECR with the atmosphere. In this contribution the preliminary results from the π0 analysis of the data acquired in proton-proton collisions at √s = 13 TeV will be presented. The Feynman-x and transverse momentum spectra obtained with the two detectors will be compared to show the consistency of the results.

DOI： 10.22323/1.395.0386

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Scopus
A simulation study for one-pion exchange contribution on very forward neutron productions in ATLAS-LHCf common events International journal Open Access

Ohashi K., Menjo H., Itow Y., Sako T.

Proceedings of Science Vol. 395 2022.3

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：Proceedings of Science

Interpretations of the mass composition of ultra-high energy cosmic rays are unclear owing to uncertainties in the hadronic interaction models. Therefore, validations of hadronic interaction models via experiments are required. Recently, the LHCf experiment demonstrated differences in very forward neutron productions between data and predictions using hadronic interaction models for pseudo-rapidity η > 10.76. Contributions of the one-pion exchange process, diffractive collisions, and non-diffractive collisions are possible sources of these differences. These three contributions exhibit different effects on the mass-sensitive observables of ultra-high energy cosmic-ray experiments; hence, it is crucial to measure these contributions separately. In this study, we present a method for separating the contribution of the one-pion exchange process from contributions of diffractive and non-diffractive collisions in ATLAS and LHCf detectors, considering detector resolutions in LHC-Run2 and Run3.

DOI： 10.22323/1.395.0190

Open Access

Scopus
Prospects for neutrino astrophysics with Hyper-Kamiokande International coauthorship International journal Open Access

Yano T., Abe K., Adrich P., Aihara H., Akutsu R., Alekseev I., Ali A., Alj Hakim Y.I., Ameli F., Anthony L.H.V., Araya A., Asaoka Y., Aushev V., Ballester F., Bandac I., Barbi M., Barr G., Batkiewicz-Kwasniak M., Bellato M., Berardi V., Bernard L., Bernardini E., Berns L., Bhadra S., Bian J., Blanchet A., Blondel A., Boiano A., Bolognesi S., Bonavera L., Booth N., Bordoni S., Borjabad S., Boschi T., Bose D., Boyd S.B., Bozza C., Bravar A., Bronner C., Brown L., Bubak A., Buchowicz A., Buizza Avanzini M., Cafagna F.S., Calabria N.F., Calvo-Mozota J.M., Cao S., Carroll A., Catanesi M.G., Cebriàn S., Chakraborty S., Choi J.H., Choubey S., Cicerchia M., Coleman J., Collazuol G., Cuen-Rochin S., Danilov M., Díaz López G., De la Fuente E., de Perio P., De Rosa G., Dealtry T., Densham C.J., Dergacheva A., Deshmukh N., Devi M.M., Di Lodovico F., Di Meo P., Di Palma I., Doyle T.A., Drakopoulou E., Drapier O., Dumarchez J., Eklund L., El Hedri S., Ellis J., Emery S., Esmaili A., Esteve R., Fedotov S., Feng J., Fernandez P., Fernández-Martinez E., Ferrario P., Ferrazzi B., Finch A., Finley C., Fiorillo G., Fitton M., Friend M., Fujii Y., Fujisawa C., Fukuda Y., Galinski G., Gao J., Garde C., Garfagnini A., Garode S., Gialanella L.

Proceedings of Science Vol. 395 2022.3

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Hyper-Kamiokande is a multi-purpose next generation neutrino experiment. The detector is a two-layered cylindrical shape ultra-pure water tank, with its height of 64 m and diameter of 71 m. The inner detector will be surrounded by tens of thousands of twenty-inch photosensors and multi-PMT modules to detect water Cherenkov radiation due to the charged particles and provide our fiducial volume of 188 kt. This detection technique is established by Kamiokande and Super-Kamiokande. As the successor of these experiments, Hyper-K will be located deep underground, 600 m below Mt. Tochibora at Kamioka in Japan to reduce cosmic-ray backgrounds. Besides our physics program with accelerator neutrino, atmospheric neutrino and proton decay, neutrino astrophysics is an important research topic for Hyper-K. With its fruitful physics research programs, Hyper-K will play a critical role in the next neutrino physics frontier. It will also provide important information via astrophysical neutrino measurements, i.e., solar neutrino, supernova burst neutrinos and supernova relic neutrino. Here, we will discuss the physics potential of Hyper-K neutrino astrophysics.

DOI： 10.22323/1.395.1193

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Scopus
Measurements of the charge ratio and polarization of cosmic-ray muons with the Super-Kamiokande detector International coauthorship International journal Open Access

Kitagawa H., Nakano Y., Koshio Y., Abe K., Bronner C., Hayato Y., Hiraide K., Ikeda M., Kameda J., Kanemura Y., Kataoka Y., Miki S., Miura M., Moriyama S., Nagao Y., Nakahata M., Nakayama S., Okamoto K., Pronost G., Sekiya H., Shiozawa M., Sonoda Y., Suzuki Y., Takeda A., Takemoto Y., Takenaka A., Tanaka H., Watanabe S., Yano T., Han S., Kajita T., Okumura K., Tashiro T., Xia J., Megias G.D., Labarga L., Marti L., Zaldivar B., Pointon B.W., Kearns E., Raaf J.L., Wan L., Wester T., Bian J., Griskevich N.J., Kropp W.R., Locke S., Mine S., Smy M.B., Sobel H.W., Takhistov V., Hill J., Kim J.Y., Lim I.T., Park R.G., Bodur B., Scholberg K., Walter C.W., Bernard L., Coffani A., Drapier O., El Hedri S., Giampaolo A., Gonin M., Mueller T.A., Paganini P., Quilain B., Ishizuka T., Nakamura T., Jang J.S., Learned J.G., Cao S., Anthony L.H.V., Martin D., Scott M., Sztuc A.A., Uchida Y., Berardi V., Catanesi M.G., Radicioni E., Calabria N.F., Machado L.N., De Rosa G., Collazuol G., Iacob F., Lamoureux M., Mattiazzi M., Ospina N., Ludovici L., Maekawa Y., Nishimura Y., Friend M., Hasegawa T., Ishida T., Kobayashi T., Jakkapu M., Matsubara T., Nakadaira T., Nakamura K., Oyama Y.

Proceedings of Science Vol. 395 2022.3

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：Proceedings of Science

Cosmic-ray muons arise from the showers of secondary particles produced via the interactions of primary cosmic particles with air nuclei at the top of the atmosphere. The interaction products, pions and kaons composing showers mostly decay to muons reflect the details of the hadronic interactions depending on their energy. Measurements of the charge ratio and polarization of cosmic-ray muons can be used to constrain high energy hadronic interaction models in the atmosphere. In this presentation, we will report the current status of the measurement of the charge ratio using data collected by the Super-Kamiokande (SK) detector located at a depth of 2700 m of water equivalent. Using the data taken in the fourth phase of SK (SK-IV), the charge ratio is measured to be 1.42 ± 0.02 (statistical uncertainty only), at the energy of 1.3 TeV. This result for the charge ratio is in good agreement with those previously obtained by deep underground experiments.

DOI： 10.22323/1.395.0360

Open Access

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Low energy radioactivity BG model in Super-Kamiokande detector from SK-IV data International coauthorship International journal Open Access

Pronost G., Abe K., Bronner C., Hayato Y., Hiraide K., Ikeda M., Kameda J., Kanemura Y., Kataoka Y., Miki S., Miura M., Moriyama S., Nagao Y., Nakahata M., Nakayama S., Okamoto K., Pronost G., Sekiya H., Shiozawa M., Sonoda Y., Suzuki Y., Takeda A., Takemoto Y., Takenaka A., Tanaka H., Watanabe S., Yano T., Han S., Kajita T., Okumura K., Tashiro T., Xia J., Megias G.D., Labarga L., Marti L., Zaldivar B., Pointon B.W., Kearns E., Raaf J.L., Wan L., Wester T., Bian J., Griskevich N.J., Kropp W.R., Locke S., Mine S., Smy M.B., Sobel H.W., Takhistov V., Hill J., Kim J.Y., Lim I.T., Park R.G., Bodur B., Scholberg K., Walter C.W., Bernard L., Coffani A., Drapier O., El Hedri S., Giampaolo A., Gonin M., Mueller T.A., Paganini P., Quilain B., Ishizuka T., Nakamura T., Jang J.S., Learned J.G., Cao S., Anthony L.H.V., Martin D., Scott M., Sztuc A.A., Uchida Y., Berardi V., Catanesi M.G., Radicioni E., Calabria N.F., Machado L.N., De Rosa G., Collazuol G., Iacob F., Lamoureux M., Mattiazzi M., Ospina N., Ludovici L., Maekawa Y., Nishimura Y., Friend M., Hasegawa T., Ishida T., Kobayashi T., Jakkapu M., Matsubara T., Nakadaira T., Nakamura K., Oyama Y., Sakashita K., Sekiguchi T.

Proceedings of Science Vol. 395 2022.3

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：Proceedings of Science

The radioactivity background are among the most dangerous background for low energy neutrino analysis in Super-Kamiokande (SK), like the solar neutrino analysis. Among them, the main contribution is coming from 222Rn, which is spread in the detector’s water due to the water source and to the photo multiplier (PMT) emanations. Up to now, its exact distribution in the detector was not known. Using our knowledge of the radon concentration in the detector water, and the SK-IV solar data, we developed a model of the radon distribution in the detector. The uncertainty on the Rn concentration associated with this model was estimated to be ∼ 0.1 mBq/m3

DOI： 10.22323/1.395.1046

Open Access

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Follow-up of GWTC-2 gravitational wave events with neutrinos from the Super-Kamiokande detector International coauthorship International journal Open Access

Abe K., Bronner C., Hayato Y., Hiraide K., Ikeda M., Kameda J., Kanemura Y., Kataoka Y., Miki S., Miura M., Moriyama S., Nagao Y., Nakahata M., Nakayama S., Okamoto K., Pronost G., Sekiya H., Shiozawa M., Sonoda Y., Suzuki Y., Takeda A., Takemoto Y., Takenaka A., Tanaka H., Watanabe S., Yano T., Han S., Kajita T., Okumura K., Tashiro T., Xia J., Megias G.D., Labarga L., Marti L., Zaldivar B., Pointon B.W., Kearns E., Raaf J.L., Wan L., Wester T., Bian J., Griskevich N.J., Kropp W.R., Locke S., Mine S., Smy M.B., Sobel H.W., Takhistov V., Hill J., Kim J.Y., Lim I.T., Park R.G., Bodur B., Scholberg K., Walter C.W., Bernard L., Coffani A., Drapier O., El Hedri S., Giampaolo A., Gonin M., Mueller T.A., Paganini P., Quilain B., Ishizuka T., Nakamura T., Jang J.S., Learned J.G., Cao S., Anthony L.H.V., Martin D., Scott M., Sztuc A.A., Uchida Y., Berardi V., Catanesi M.G., Radicioni E., Calabria N.F., Machado L.N., De Rosa G., Collazuol G., Iacob F., Lamoureux M., Mattiazzi M., Ospina N., Ludovici L., Maekawa Y., Nishimura Y., Friend M., Hasegawa T., Ishida T., Kobayashi T., Jakkapu M., Matsubara T., Nakadaira T., Nakamura K., Oyama Y., Sakashita K., Sekiguchi T., Tsukamoto T.

Proceedings of Science Vol. 395 2022.3

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：Proceedings of Science

Super-Kamiokande (SK) is a 50-kt water Cherenkov detector, instrumented with ∼ 13k photo-multipliers and running since 1996. It is sensitive to neutrinos with energies ranging from 4.5 MeV to several TeV. A new framework has been developed for the follow-up of gravitational wave (GW) alerts issued by the LIGO-Virgo collaboration (LVC). Neutrinos are searched for, using a 1000-second time window centered on the alert time and in both SK low-energy and high-energy samples. Such observation can then be used to constrain the neutrino emission from the GW source. The significance of potential signals has been obtained by comparing neutrino direction with the localization of the GW. The computation of limits on incoming neutrino flux and on the total energy emitted in neutrinos by the source has been performed for the different neutrino flavors. The results using the LVC GWTC-2 catalog (covering O3a period) are presented, as well as the outlooks for the future real-time public release of follow-ups for the O4 period (in 2022) and beyond.

DOI： 10.22323/1.395.0947

Open Access

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Diffuse Supernova Neutrino Background search at Super-Kamiokande with neutron tagging International coauthorship International journal Open Access

Giampaolo A., El Hedri S., Abe K., Bronner C., Hayato Y., Hiraide K., Ikeda M., Kameda J., Kanemura Y., Kataoka Y., Miki S., Miura M., Moriyama S., Nagao Y., Nakahata M., Nakayama S., Okamoto K., Pronost G., Sekiya H., Shiozawa M., Sonoda Y., Suzuki Y., Takeda A., Takemoto Y., Takenaka A., Tanaka H., Watanabe S., Yano T., Han S., Kajita T., Okumura K., Tashiro T., Xia J., Megias G.D., Labarga L., Marti L., Zaldivar B., Pointon B.W., Kearns E., Raaf J.L., Wan L., Wester T., Bian J., Griskevich N.J., Kropp W.R., Locke S., Mine S., Smy M.B., Sobel H.W., Takhistov V., Hill J., Kim J.Y., Lim I.T., Park R.G., Bodur B., Scholberg K., Walter C.W., Bernard L., Coffani A., Drapier O., Giampolo A., Gonin M., Mueller T.A., Paganini P., Quilain B., Ishizuka T., Nakamura T., Jang J.S., Learned J.G., Cao S., Anthony L.H.V., Martin D., Scott M., Sztuc A.A., Uchida Y., Berardi V., Catanesi M.G., Radicioni E., Calabria N.F., Machado L.N., De Rosa G., Collazuol G., Iacob F., Lamoureux M., Mattiazzi M., Ospina N., Ludovici L., Maekawa Y., Nishimura Y., Friend M., Hasegawa T., Ishida T., Kobayashi T., Jakkapu M., Matsubara T., Nakadaira T., Nakamura K., Oyama Y., Sakashita K.

Proceedings of Science Vol. 395 2022.3

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：Proceedings of Science

Detecting the Diffuse Supernova Neutrino Background at Super-Kamiokande requires designing state-of-the-art background removal technique to reject radioactivity induced by cosmic muon spallation, and identify atmospheric neutrino interactions. Identifying the neutron produced by the interaction of DSNB antineutrinos would allow to remove most of these backgrounds, but is particularly challenging in pure water. With the advent of the SK-Gd era, with Gadolinium being dissolved in the SK water, the efficiency of the neutron tagging procedure will increase dramatically, and the SK experiment will make significant gains in its sensitivity to the DSNB. I will present the role of neutron tagging and the challenges it provides, as well as discuss the impact of the SK-Gd project.

DOI： 10.22323/1.395.1154

Open Access

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Construction status and prospects of the Hyper-Kamiokande project International coauthorship International journal Open Access

Itow Y., Abe K., Adrich P., Aihara H., Akutsu R., Alekseev I., Ali A., Alj Hakim Y.I., Ameli F., Anthony L.H.V., Araya A., Asaoka Y., Aushev V., Ballester F., Bandac I., Barbi M., Barr G., Batkiewicz-Kwasniak M., Bellato M., Berardi V., Bernard L., Bernardini E., Berns L., Bhadra S., Bian J., Blanchet A., Blondel A., Boiano A., Bolognesi S., Bonavera L., Booth N., Bordoni S., Borjabad S., Boschi T., Bose D., Boyd S.B., Bozza C., Bravar A., Bronner C., Brown L., Bubak A., Buchowicz A., Buizza Avanzini M., Cafagna F.S., Calabria N.F., Calvo-Mozota J.M., Cao S., Carroll A., Catanesi M.G., Cebriàn S., Chakraborty S., Choi J.H., Choubey S., Cicerchia M., Coleman J., Collazuol G., Cuen-Rochin S., Danilov M., Díaz López G., De la Fuente E., de Perio P., De Rosa G., Dealtry T., Densham C.J., Dergacheva A., Deshmukh N., Devi M.M., Di Lodovico F., Di Meo P., Di Palma I., Doyle T.A., Drakopoulou E., Drapier O., Dumarchez J., Eklund L., El Hedri S., Ellis J., Emery S., Esmaili A., Esteve R., Fedotov S., Feng J., Fernandez P., Fernández-Martinez E., Ferrario P., Ferrazzi B., Finch A., Finley C., Fiorillo G., Fitton M., Friend M., Fujii Y., Fujisawa C., Fukuda Y., Galinski G., Gao J., Garde C., Garfagnini A., Garode S., Gialanella L.

Proceedings of Science Vol. 395 2022.3

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：Proceedings of Science

The Hyper-Kamiokande project is a 258-kton Water Cherenkov together with a 1.3-MW high-intensity neutrino beam from the Japan Proton Accelerator Research Complex (J-PARC). The inner detector with 186-kton fiducial volume is viewed by 20-inch photomultiplier tubes (PMTs) and multi-PMT modules, and thereby provides state-of-the-art of Cherenkov ring reconstruction with thresholds in the range of few MeVs. The project is expected to lead to precision neutrino oscillation studies, especially neutrino CP violation, nucleon decay searches, and low energy neutrino astronomy. In 2020, the project was officially approved and construction of the far detector was started at Kamioka. In 2021, the excavation of the access tunnel and initial mass production of the newly developed 20-inch PMTs was also started. In this paper, we present a basic overview of the project and the latest updates on the construction status of the project, which is expected to commence operation in 2027.

DOI： 10.22323/1.395.1192

Open Access

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Diffuse Supernova Neutrino Background Search at Super-Kamiokande

El Hedri S., Ashida Y., Giampaolo A., Abe K., Bronner C., Hayato Y., Hiraide K., Ikeda M., Kameda J., Kanemura Y., Kataoka Y., Miki S., Miura M., Moriyama S., Nagao Y., Nakahata M., Nakayama S., Okamoto K., Pronost G., Sekiya H., Shiozawa M., Sonoda Y., Suzuki Y., Takeda A., Takemoto Y., Takenaka A., Tanaka H., Watanabe S., Yano T., Han S., Kajita T., Okumura K., Tashiro T., Xia J., Megias G.D., Labarga L., Marti L., Zaldivar B., Pointon B.W., Kearns E., Raaf J.L., Wan L., Wester T., Bian J., Griskevich N.J., Kropp W.R., Locke S., Mine S., Smy M.B., Sobel H.W., Takhistov V., Hill J., Kim J.Y., Lim I.T., Park R.G., Bodur B., Scholberg K., Walter C.W., Bernard L., Coffani A., Drapier O., Gimpaolo A., Gonin M., Mueller T.A., Paganini P., Quilain B., Ishizuka T., Nakamura T., Jang J.S., Learned J.G., Cao S., Anthony L.H.V., Martin D., Scott M., Sztuc A.A., Uchida Y., Berardi V., Catanesi M.G., Radicioni E., Calabria N.F., Machado L.N., De Rosa G., Collazuol G., Iacob F., Lamoureux M., Mattiazzi M., Ospina N., Ludovici L., Maekawa Y., Nishimura Y., Friend M., Hasegawa T., Ishida T., Kobayashi T., Jakkapu M., Matsubara T., Nakadaira T., Nakamura K., Oyama Y.

Proceedings of Science Vol. 395 2022.3

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Publisher：Proceedings of Science

We present the results of a search for the Diffuse Supernova Neutrino Background (DSNB) at Super-Kamiokande (SK) that incorporates 22.5 × 2970 kton.days of data from its fourth data-taking phase. Two analyses, with different energy regimes covering the 9.3−81.3 MeV antineutrino energy range, have been developed based on previous SK searches, with substantially improved background modeling and data reduction techniques. Moreover, a combined analysis of nearly 20 years of SK data (1996-2018) has been performed, with a 90% C.L. sensitivity to the DSNB flux comparable to various DSNB predictions. No significant evidence for a DSNB signal has been observed, and both analyses set world-leading limits on the DSNB flux that can reach about 2.7ν<inf>e</inf>.cm−2.s−1 for a wide range of models.

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Upgrade of Honda atmospheric neutrino flux calculation with implementing recent hadron interaction measurement

Sato K., Menjo H., Itow Y., Honda M.

Proceedings of Science Vol. 395 2022.3

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Publisher：Proceedings of Science

We will upgrade atmospheirc neutrino flux calculation by M. Honda (Honda flux), which has been used as a flux prediction in many experiments including Super-Kamiokande and has greatly contributed in the neutrino physics. The dominant uncertainty of the Honda flux arises from insufficient understanding of the hadron interactions inside air showers. Conventionally hadron interaction model in Honda flux has been tuned based on atmospheric muon observation data, but it arises relatively large uncertainties in momentum region below 1 GeV/c and above O(10) GeV/c. Recently several precise measurements for hadron production using accelerator beams have been performed. We incorporate the accelerator-data-driven tuning into Honda flux calculation to complement the muon tuning.

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First gadolinium loading to Super-Kamiokande Invited Reviewed International coauthorship International journal Open Access

Abe, K; Bronner, C; Hayato, Y; Hiraide, K; Ikeda, M; Imaizumi, S; Kameda, J; Kanemura, Y; Kataoka, Y; Miki, S; Miura, M; Moriyama, S; Nagao, Y; Nakahata, M; Nakayama, S; Okada, T; Okamoto, K; Orii, A; Pronost, G; Sekiya, H; Shiozawa, M; Sonoda, Y; Suzuki, Y; Takeda, A; Takemoto, Y; Takenaka, A; Tanaka, H; Watanabe, S; Yano, T; Han, S; Kajita, T; Okumura, K; Tashiro, T; Xia, J; Megias, GD; Bravo-Berguño, D; Labarga, L; Marti, L; Zaldivar, B; Pointon, BW; Blaszczyk, FDM; Kearns, E; Raaf, JL; Stone, JL; Wan, L; Wester, T; Bian, J; Griskevich, NJ; Kropp, WR; Locke, S; Mine, S; Smy, MB; Sobel, HW; Takhistov, ; Hill, J; Kim, JY; Lim, IT; Park, RG; Bodur, B; Scholberg, K; Walter, CW; Bernard, L; Coffani, A; Drapier, O; El Hedri, S; Giampaolo, A; Gonin, M; Mueller, TA; Paganini, P; Quilain, B; Ishizuka, T; Nakamura, T; Jang, JS; Learned, JG; Anthony, LH; Martin, D; Scott, M; Sztuc, AA; Uchida, Y; Cao, S; Berardi, ; Catanesi, MG; Radicioni, E; Calabria, NF; Machado, LN; De Rosa, G; Collazuol, G; Iacob, F; Lamoureux, M; Mattiazzi, M; Ospina, N; Ludovici, L; Maekawa, Y; Nishimura, Y; Friend, M; Hasegawa, T; Ishida, T; Kobayashi, T; Jakkapu, M; Matsubara, T; Nakadaira, T; Nakamura, K; Oyama, Y; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Boschi, T; Gao, J; Di Lodovico, F; Migenda, J; Taani, M; Zsoldos, S; Kotsar, Y; Nakano, Y; Ozaki, H; Shiozawa, T; Suzuki, AT; Takeuchi, Y; Yamamoto, S; Ali, A; Ashida, Y; Feng, J; Hirota, S; Kikawa, T; Mori, M; Nakaya, T; Wendell, RA; Yasutome, K; Fernandez, P; McCauley, N; Mehta, P; Tsui, KM; Fukuda, Y; Itow, Y; Menjo, H; Niwa, T; Sato, K; Tsukada, M; Lagoda, J; Lakshmi, SM; Mijakowski, P; Zalipska, J; Jiang, J; Jung, CK; Vilela, C; Wilking, MJ; Yanagisawa, C; Hagiwara, K; Harada, M; Horai, T; Ishino, H; Ito, S; Kitagawa, F; Koshio, Y; Ma, W; Piplani, N; Sakai, S; Barr, G; Barrow, D; Cook, L; Goldsack, A; Samani, S; Wark, D; Nova, F; Yang, JY; Jenkins, SJ; Malek, M; McElwee, JM; Stone, O; Thiesse, MD; Thompson, LF; Okazawa, H; Kim, SB; Seo, JW; Yu, ; Ichikawa, AK; Nakamura, K; Nishijima, K; Koshiba, M; Iwamoto, K; Nakajima, Y; Ogawa, N; Yokoyama, M; Martens, K; Vagins, MR; Kuze, M; Izumiyama, S; Yoshida, T; Inomoto, M; Ishitsuka, M; Ito, H; Kinoshita, T; Matsumoto, R; Ohta, K; Shinoki, M; Suganuma, T; Martin, JF; Tanaka, HA; Towstego, T; Akutsu, R; Hartz, M; Konaka, A; de Perio, P; Prouse, NW; Chen, S; Xu, BD; Posiadala-Zezula, M; Hadley, D; O'Flaherty, M; Richards, B; Jamieson, B; Walker, J; Minamino, A; Okamoto, K; Pintaudi, G; Sano, S; Sasaki, R

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT Vol. 1027 2022.3

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Language：English Publishing type：Research paper (scientific journal) Publisher：Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment

In order to improve Super-Kamiokande's neutron detection efficiency and to thereby increase its sensitivity to the diffuse supernova neutrino background flux, 13 tons of Gd<inf>2</inf>(SO<inf>4</inf>)<inf>3</inf>⋅8H<inf>2</inf>O (gadolinium sulfate octahydrate) was dissolved into the detector's otherwise ultrapure water from July 14 to August 17, 2020, marking the start of the SK-Gd phase of operations. During the loading, water was continuously recirculated at a rate of 60 m3/h, extracting water from the top of the detector and mixing it with concentrated Gd<inf>2</inf>(SO<inf>4</inf>)<inf>3</inf>⋅8H<inf>2</inf>O solution to create a 0.02% solution of the Gd compound before injecting it into the bottom of the detector. A clear boundary between the Gd-loaded and pure water was maintained through the loading, enabling monitoring of the loading itself and the spatial uniformity of the Gd concentration over the 35 days it took to reach the top of the detector. During the subsequent commissioning the recirculation rate was increased to 120 m3/h, resulting in a constant and uniform distribution of Gd throughout the detector and water transparency equivalent to that of previous pure-water operation periods. Using an Am–Be neutron calibration source the mean neutron capture time was measured to be 115±1 μs, which corresponds to a Gd concentration of 111±2 ppm, as expected for this level of Gd loading. This paper describes changes made to the water circulation system for this detector upgrade, the Gd loading procedure, detector commissioning, and the first neutron calibration measurements in SK-Gd.

DOI： 10.1016/j.nima.2021.166248

Web of Science

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Diffuse supernova neutrino background search at Super-Kamiokande Reviewed International coauthorship International journal Open Access

Abe, K; Bronner, C; Hayato, Y; Hiraide, K; Ikeda, M; Imaizumi, S; Kameda, J; Kanemura, Y; Kataoka, Y; Miki, S; Miura, M; Moriyama, S; Nagao, Y; Nakahata, M; Nakayama, S; Okada, T; Okamoto, K; Orii, A; Pronost, G; Sekiya, H; Shiozawa, M; Sonoda, Y; Suzuki, Y; Takeda, A; Takemoto, Y; Takenaka, A; Tanaka, H; Watanabe, S; Yano, T; Han, S; Kajita, T; Okumura, K; Tashiro, T; Xia, J; Megias, GD; Bravo-Berguño, D; Labarga, L; Marti, L; Zaldivar, B; Pointon, BW; Blaszczyk, FDM; Kearns, E; Raaf, JL; Stone, JL; Wan, L; Wester, T; Bian, J; Griskevich, NJ; Kropp, WR; Locke, S; Mine, S; Smy, MB; Sobel, HW; Takhistov, ; Hill, J; Kim, JY; Lim, IT; Park, RG; Bodur, B; Scholberg, K; Walter, CW; Cao, S; Bernard, L; Coffani, A; Drapier, O; El Hedri, S; Giampaolo, A; Gonin, M; Mueller, TA; Paganini, P; Quilain, B; Ishizuka, T; Nakamura, T; Jang, JS; Learned, JG; Anthony, LH; Martin, D; Scott, M; Sztuc, AA; Uchida, Y; Berardi, ; Catanesi, MG; Radicioni, E; Calabria, NF; Machado, LN; De Rosa, G; Collazuol, G; Iacob, F; Lamoureux, M; Mattiazzi, M; Ospina, N; Ludovici, L; Maekawa, Y; Nishimura, Y; Friend, M; Hasegawa, T; Ishida, T; Kobayashi, T; Jakkapu, M; Matsubara, T; Nakadaira, T; Nakamura, K; Oyama, Y; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Kotsar, Y; Nakano, Y; Ozaki, H; Shiozawa, T; Suzuki, AT; Takeuchi, Y; Yamamoto, S; Ali, A; Ashida, Y; Feng, J; Hirota, S; Kikawa, T; Mori, M; Nakaya, T; Wendell, RA; Yasutome, K; Fernandez, P; McCauley, N; Mehta, P; Tsui, KM; Fukuda, Y; Itow, Y; Menjo, H; Niwa, T; Sato, K; Tsukada, M; Lagoda, J; Lakshmi, SM; Mijakowski, P; Zalipska, J; Jiang, J; Jung, CK; Vilela, C; Wilking, MJ; Yanagisawa, C; Hagiwara, K; Harada, M; Horai, T; Ishino, H; Ito, S; Kitagawa, H; Koshio, Y; Ma, W; Piplani, N; Sakai, S; Barr, G; Barrow, D; Cook, L; Goldsack, A; Samani, S; Wark, D; Nova, F; Boschi, T; Di Lodovico, F; Gao, J; Migenda, J; Taani, M; Zsoldos, S; Yang, JY; Jenkins, SJ; Malek, M; McElwee, JM; Stone, O; Thiesse, MD; Thompson, LF; Okazawa, H; Kim, SB; Seo, JW; Yu, ; Nishijima, K; Koshiba, M; Iwamoto, K; Nakagiri, K; Nakajima, Y; Ogawa, N; Yokoyama, M; Martens, K; Vagins, MR; Kuze, M; Izumiyama, S; Yoshida, T; Inomoto, M; Ishitsuka, M; Ito, H; Kinoshita, T; Matsumoto, R; Ohta, K; Shinoki, M; Suganuma, T; Ichikawa, AK; Nakamura, K; Martin, JF; Tanaka, HA; Towstego, T; Akutsu, R; Gousy-Leblanc, ; Hartz, M; Konaka, A; de Perio, P; Prouse, NW; Chen, S; Xu, BD; Zhang, Y; Posiadala-Zezula, M; Hadley, D; O'Flaherty, M; Richards, B; Jamieson, B; Walker, J; Minamino, A; Okamoto, K; Pintaudi, G; Sano, S; Sasaki, R

PHYSICAL REVIEW D Vol. 104 ( 12 ) 2021.12

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Language：English Publishing type：Research paper (scientific journal) Publisher：Physical Review D

We have conducted a new search for the diffuse supernova neutrino background (DSNB) flux at Super-Kamiokande (SK), with a 22.5×2970-kton·day exposure from its fourth operational phase IV. With the new analysis we improve on the existing background reduction techniques and systematic uncertainties and take advantage of an improved neutron tagging algorithm to lower the energy threshold compared to the previous phases of SK. This allows for setting the world's most stringent upper limit on the extraterrestrial ν¯e flux, for neutrino energies below 31.3 MeV. The SK-IV results are combined with the ones from the first three phases of SK to perform a joint analysis using 22.5×5823 kton·days of data. This analysis has the world's best sensitivity to the DSNB ν¯e flux, comparable to the predictions from various models. For neutrino energies larger than 17.3 MeV, the new combined 90% CL upper limits on the DSNB ν¯e flux lie around 2.7 cm-2·sec-1, strongly disfavoring the most optimistic predictions. Finally, potentialities of the gadolinium phase of SK and the future Hyper-Kamiokande experiment are discussed.

DOI： 10.1103/PhysRevD.104.122002

Web of Science

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Search for tens of MeV neutrinos associated with gamma-ray bursts in Super-Kamiokande Reviewed International coauthorship International journal Open Access

Abe, K; Bronner, C; Hayato, Y; Ikeda, M; Imaizumi, S; Ito, H; Kameda, J; Kataoka, Y; Kato, Y; Kishimoto, Y; Miura, M; Moriyama, S; Mochizuki, T; Nagao, Y; Nakahata, M; Nakajima, Y; Nakayama, S; Okada, T; Okamoto, K; Pronost, G; Sekiya, H; Shiozawa, M; Sonoda, Y; Suzuki, Y; Takeda, A; Takemoto, Y; Takenaka, A; Tanaka, H; Yano, T; Han, S; Kajita, T; Okumura, K; Tashiro, T; Wang, R; Xia, J; Megias, GD; Bravo-Berguño, D; Labarga, L; Marti, L; Zaldivar, B; Blaszczyk, FDM; Kearns, E; Raaf, JL; Stone, JL; Wan, L; Wester, T; Pointon, BW; Bian, J; Griskevich, NJ; Kropp, WR; Locke, S; Mine, S; Smy, MB; Sobel, HW; Takhistov, ; Weatherly, P; Ganezer, KS; Hill, J; Kim, JY; Lim, IT; Park, RG; Bodur, B; Scholberg, K; Walter, CW; Bernard, L; Coffani, A; Drapier, O; El Hedri, S; Giampaolo, A; Gonin, M; Mueller, TA; Paganini, P; Quilain, B; Ishizuka, T; Nakamura, T; Jang, JS; Learned, JG; Matsuno, S; Anthony, LH; Litchfield, RP; Sztuc, AA; Uchida, Y; Berardi, ; Catanesi, MG; Radicioni, E; Calabria, NF; Machado, LN; De Rosa, G; Collazuol, G; Iacob, F; Lamoureux, M; Ospina, N; Ludovici, L; Nishimura, Y; Cao, S; Friend, M; Hasegawa, T; Ishida, T; Kobayashi, T; Jakkapu, M; Matsubara, T; Nakadaira, T; Nakamura, K; Oyama, Y; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Boschi, T; Di Lodovico, F; Sedgwick, SM; Taani, M; Zsoldos, S; Hasegawa, M; Isobe, Y; Miyabe, H; Nakano, Y; Shiozawa, T; Sugimoto, T; Suzuki, AT; Takeuchi, Y; Yamamoto, S; Ali, A; Ashida, Y; Feng, J; Hirota, S; Jiang, M; Ichikawa, AK; Kikawa, T; Mori, M; Nakamura, KE; Nakaya, T; Wendell, RA; Yasutome, K; Fernandez, P; McCauley, N; Mehta, P; Pritchard, A; Tsui, KM; Fukuda, Y; Itow, Y; Menjo, H; Niwa, T; Sato, K; Tsukada, M; Mijakowski, P; Frankiewicz, K; Jung, CK; Vilela, C; Wilking, MJ; Yanagisawa, C; Fukuda, D; Harada, M; Hagiwara, K; Horai, T; Ishino, H; Ito, S; Koshio, Y; Ma, W; Piplani, N; Sakai, S; Sakuda, M; Takahira, Y; Xu, C; Kuno, Y; Barr, G; Barrow, D; Cook, L; Goldsack, A; Samani, S; Simpson, C; Wark, D; Nova, F; Yang, JY; Jenkins, SJ; Malek, M; McElwee, JM; Stone, O; Thiesse, MD; Thompson, LF; Okazawa, H; Choi, Y; Kim, SB; Yu, ; Nishijima, K; Koshiba, M; Iwamoto, K; Ogawa, N; Yokoyama, M; Martens, K; Vagins, MR; Izumiyama, S; Kuze, M; Tanaka, M; Yoshida, T; Inomoto, M; Ishitsuka, M; Matsumoto, R; Ohta, K; Shinoki, M; Martin, JF; Nantais, CM; Tanaka, HA; Towstego, T; Akutsu, R; Hartz, M; Konaka, A; de Perio, P; Prouse, NW; Chen, S; Xu, BD; Posiadala-Zezula, M; Richards, B; Jamieson, B; Walker, J; Minamino, A; Okamoto, K; Pintaudi, G; Sasaki, R

PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS Vol. 2021 ( 10 ) 2021.10

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Language：English Publishing type：Research paper (scientific journal) Publisher：Progress of Theoretical and Experimental Physics

A search for neutrinos produced in coincidence with gamma-ray bursts (GRBs) was conducted with the Super-Kamiokande (SK) detector. Between December 2008 and March 2017, the Gamma-ray Coordinates Network recorded 2208 GRBs that occurred during normal SK operation. Several time windows around each GRB were used to search for coincident neutrino events. No statistically significant signal in excess of the estimated backgrounds was detected. The νe fluence in the range from 8 MeV to 100 MeV in positron total energy for νe+p → e++n was found to be less than 5.07 × 105 cm-2 per GRB at a 90% confidence level. For all GRBs, upper bounds were obtained on the fluence as a function of neutrino energy. Additionally, for GRBs at known distances, upper limits were set for the neutrino energy emission at the GRB.

DOI： 10.1093/ptep/ptab081

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Web of Science

Scopus
Performance of RHICf detector during operation in 2017 Reviewed International coauthorship International journal Open Access

O. Adriani, E. Berti, L. Bonechi, R. D'Alessandro, Y. Goto, B. Hong, Y. Itow, K. Kasahara, M.H. Kim, H. Menjo, I. Nakagawa, K. Ohashi, T. Sako, N. Sakurai, K. Sato, R. Seidl, K. Tanida, S. Torii, A. Tricomi

Journal of Instrumentation Vol. 16 ( 10 ) page： P10027 - P10027 2021.10

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Language：English Publishing type：Research paper (scientific journal) Publisher：IOP Publishing

DOI： 10.1088/1748-0221/16/10/P10027

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Other Link： https://iopscience.iop.org/article/10.1088/1748-0221/16/10/P10027/pdf
Search for Neutrinos in Coincidence with Gravitational Wave Events from the LIGO-Virgo O3a Observing Run with the Super-Kamiokande Detector Reviewed International coauthorship International journal Open Access

Abe, K; Bronner, C; Hayato, Y; Ikeda, M; Imaizumi, S; Kameda, J; Kanemura, Y; Kataoka, Y; Miki, S; Miura, M; Moriyama, S; Nagao, Y; Nakahata, M; Nakayama, S; Okada, T; Okamoto, K; Orii, A; Pronost, G; Sekiya, H; Shiozawa, M; Sonoda, Y; Suzuki, Y; Takeda, A; Takemoto, Y; Takenaka, A; Tanaka, H; Watanabe, S; Yano, T; Han, S; Kajita, T; Okumura, K; Tashiro, T; Wang, R; Xia, J; Megias, GD; Bravo-Berguño, D; Labarga, L; Marti, L; Zaldivar, B; Pointon, BW; Blaszczyk, FD; Kearns, E; Raaf, JL; Stone, JL; Wan, L; Wester, T; Bian, J; Griskevich, NJ; Kropp, WR; Locke, S; Mine, S; Smy, MB; Sobel, HW; Takhistov, V; Weatherly, P; Hill, J; Kim, JY; Lim, IT; Park, RG; Bodur, B; Scholberg, K; Walter, CW; Bernard, L; Coffani, A; Drapier, O; El Hedri, S; Giampaolo, A; Gonin, M; Mueller, TA; Paganini, P; Quilain, B; Ishizuka, T; Nakamura, T; Jang, JS; Learned, JG; Anthony, LHV; Martin, DGR; Sztuc, AA; Uchida, Y; Berardi, V; Catanesi, MG; Radicioni, E; Calabria, NF; Machado, LN; De Rosa, G; Collazuol, G; Iacob, F; Lamoureux, M; Ospina, N; Ludovici, L; Maekawa, Y; Nishimura, Y; Cao, S; Friend, M; Hasegawa, T; Ishida, T; Jakkapu, M; Kobayashi, T; Matsubara, T; Nakadaira, T; Nakamura, K; Oyama, Y; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Kotsar, Y; Nakano, Y; Ozaki, H; Shiozawa, T; Suzuki, AT; Takeuchi, Y; Yamamoto, S; Ali, A; Ashida, Y; Feng, J; Hirota, S; Kikawa, T; Mori, M; Nakaya, T; Wendell, RA; Yasutome, K; Fernandez, P; McCauley, N; Mehta, P; Pritchard, A; Tsui, KM; Fukuda, Y; Itow, Y; Menjo, H; Niwa, T; Sato, K; Tsukada, M; Mijakowski, P; Jiang, J; Jung, CK; Vilela, C; Wilking, MJ; Yanagisawa, C; Hagiwara, K; Harada, M; Horai, T; Ishino, H; Ito, S; Koshio, Y; Kitagawa, H; Ma, W; Piplani, N; Sakai, S; Kuno, Y; Barr, G; Barrow, D; Cook, L; Goldsack, A; Samani, S; Simpson, C; Wark, D; Nova, F; Boschi, T; Di Lodovico, F; Migenda, J; Sedgwick, SM; Taani, M; Zsoldos, S; Yang, JY; Jenkins, SJ; Malek, M; McElwee, JM; Stone, O; Thiesse, MD; Thompson, LF; Okazawa, H; Kim, SB; Yu, I; Nishijima, K; Koshiba, M; Iwamoto, K; Nakajima, Y; Ogawa, N; Yokoyama, M; Martens, K; Vagins, MR; Izumiyama, S; Kuze, M; Tanaka, M; Yoshida, T; Inomoto, M; Ishitsuka, M; Ito, H; Matsumoto, R; Ohta, K; Shinoki, M; Martin, JF; Tanaka, HA; Towstego, T; Akutsu, R; Hartz, M; Konaka, A; de Perio, P; Prouse, NW; Chen, S; Xu, BD; Posiadala-Zezula, M; Hadley, D; Richards, B; Jamieson, B; Walker, J; Minamino, A; Okamoto, K; Pintaudi, G; Sano, S; Sasaki, R; Ichikawa, AK; Nakamura, K

ASTROPHYSICAL JOURNAL Vol. 918 ( 2 ) 2021.9

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Language：English Publishing type：Research paper (scientific journal) Publisher：Astrophysical Journal

The Super-Kamiokande detector can be used to search for neutrinos in time coincidence with gravitational waves detected by the LIGO–Virgo Collaboration (LVC). Both low-energy (7–100 MeV) and high-energy (0.1–105 GeV) samples were analyzed in order to cover a very wide neutrino spectrum. Follow-ups of 36 (out of 39) gravitational waves reported in the GWTC-2 catalog were examined; no significant excess above the background was observed, with 10 (24) observed neutrinos compared with 4.8 (25.0) expected events in the high-energy (low-energy) samples. A statistical approach was used to compute the significance of potential coincidences. For each observation, p-values were estimated using neutrino direction and LVC sky map; the most significant event (GW190602_175927) is associated with a post-trial p-value of 7.8% (1.4σ). Additionally, flux limits were computed independently for each sample and by combining the samples. The energy emitted as neutrinos by the identified gravitational wave sources was constrained, both for given flavors and for all flavors assuming equipartition between the different flavors, independently for each trigger and by combining sources of the same nature.

DOI： 10.3847/1538-4357/ac0d5a

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Scopus
The energy spectrum of forward photons measured by the RHICf experiment in √s = 510 GeV proton-proton collisions International coauthorship International journal Open Access

Sato K., Itow Y., Menjo H., Ueno M., Ohashi K., Sako T., Goto Y., Nakagawa I., Saidl R., Park J.S., Kim M.H., Hong B., Tanida K., Torii S., Kasahara K., Sakurai N., Adriani O., D'Alessandro R., Bonechi L., Berti E., Tricomi A.

Proceedings of Science Vol. 358 2021.7

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：Proceedings of Science

The Relativistic Heavy Ion Collider forward (RHICf) experiment aims at understanding the high-energy hadronic interaction by measuring the cross sections of very forward neutral particles in proton-proton collisions at √s = 510 GeV. For the analysis of the photon measurement, the trigger efficiency and the particle identification performance are studied by using the Monte Carlo simulation data and the experimental data. In the RHICf operation, two kinds of trigger modes (Shower, HighEM) were implemented. The trigger efficiency of the Shower trigger is 100% for photons with the energies more than 20 GeV. The HighEM trigger is designed to detect high energy photons effectively, and the trigger efficiency of the HighEM trigger is 90% for photons with the energies more than 130 GeV. The correction factor for the photon identification is calculated by using the efficiency and purity. It is found that this correction does not make a sizeable effect on the shape of the energy spectrum because the energy dependency of the factor is small.

DOI： 10.22323/1.358.0413

Open Access

Scopus
The energy spectrum of forward photons measured by the RHICf experiment in √s = 510 GeV proton-proton collisions International coauthorship International journal Open Access

Sato K., Itow Y., Menjo H., Ueno M., Ohashi K., Sako T., Goto Y., Nakagawa I., Saidl R., Park J.S., Kim M.H., Hong B., Tanida K., Torii S., Kasahara K., Sakurai N., Adriani O., D'Alessandro R., Bonechi L., Berti E., Tricomi A.

Proceedings of Science Vol. 358 2021.7

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：Proceedings of Science

The Relativistic Heavy Ion Collider forward (RHICf) experiment aims at understanding the high-energy hadronic interaction by measuring the cross sections of very forward neutral particles in proton-proton collisions at √s = 510 GeV. For the analysis of the photon measurement, the trigger efficiency and the particle identification performance are studied by using the Monte Carlo simulation data and the experimental data. In the RHICf operation, two kinds of trigger modes (Shower, HighEM) were implemented. The trigger efficiency of the Shower trigger is 100% for photons with the energies more than 20 GeV. The HighEM trigger is designed to detect high energy photons effectively, and the trigger efficiency of the HighEM trigger is 90% for photons with the energies more than 130 GeV. The correction factor for the photon identification is calculated by using the efficiency and purity. It is found that this correction does not make a sizeable effect on the shape of the energy spectrum because the energy dependency of the factor is small.

DOI： 10.22323/1.358.0413

Open Access

Scopus
Supernova Model Discrimination with Hyper-Kamiokande Reviewed International coauthorship International journal Open Access

Abe, K; Adrich, P; Aihara, H; Akutsu, R; Alekseev, ; Ali, A; Ameli, F; Anghel, ; Anthony, LH; Antonova, M; Araya, A; Asaoka, Y; Ashida, Y; Aushev, ; Ballester, F; Bandac, ; Barbi, M; Barker, GJ; Barr, G; Batkiewicz-Kwasniak, M; Bellato, M; Berardi, ; Bergevin, M; Bernard, L; Bernardini, E; Berns, L; Bhadra, S; Bian, J; Blanchet, A; Blaszczyk, FDM; Blondel, A; Boiano, A; Bolognesi, S; Bonavera, L; Booth, N; Borjabad, S; Boschi, T; Bose, D; Bozza, C; Bravar, A; Bravo-Berguño, D; Bronner, C; Brown, L; Bubak, A; Buchowicz, A; Avanzini, MB; Cafagna, FS; Calabria, NF; Calvo-Mozota, JM; Cao, S; Cartwright, SL; Carroll, A; Catanesi, MG; Cebriàn, S; Chabera, M; Chakraborty, S; Checchia, C; Choi, JH; Choubey, S; Cicerchia, M; Coleman, J; Collazuol, G; Cook, L; Cowan, G; Cuen-Rochin, S; Danilov, M; Lopez, GD; De la Fuente, E; de Perio, P; De Rosa, G; Dealtry, T; Densham, CJ; Dergacheva, A; Deshmukh, N; Devi, MM; Di Lodovico, F; Di Meo, P; Di Palma, ; Doyle, TA; Drakopoulou, E; Drapier, O; Dumarchez, J; Dunne, P; Dziewiecki, M; Eklund, L; El Hedri, S; Ellis, J; Emery, S; Esmaili, A; Esteve, R; Evangelisti, A; Feely, M; Fedotov, S; Feng, J; Fernandez, P; Fernández-Martinez, E; Ferrario, P; Ferrazzi, B; Feusels, T; Finch, A; Finley, C; Fiorentini, A; Fiorillo, G; Fitton, M; Frankiewicz, K; Friend, M; Fujii, Y; Fukuda, Y; Galinski, G; Gao, J; Garde, C; Garfagnini, A; Garode, S; Gialanella, L; Giganti, C; Gomez-Cadenas, JJ; Gonin, M; González-Nuevo, J; Gorin, A; Gornea, R; Gousy-Leblanc, ; Gramegna, F; Grassi, M; Grella, G; Guigue, M; Gumplinger, P; Hadley, DR; Harada, M; Hartfiel, B; Hartz, M; Hassani, S; Hastings, NC; Hayato, Y; Hernando-Morata, JA; Herrero, ; Hill, J; Hiraide, K; Hirota, S; Holin, A; Horiuchi, S; Hoshina, K; Hultqvist, K; Iacob, F; Ichikawa, AK; Ibnsalih, WI; Iijima, T; Ikeda, M; Inomoto, M; Inoue, K; Insler, J; Ioannisian, A; Ishida, T; Ishidoshiro, K; Ishino, H; Ishitsuka, M; Ito, H; Ito, S; Itow, Y; Iwamoto, K; Izmaylov, A; Izumi, N; Izumiyama, S; Jakkapu, M; Jamieson, B; Jang, H; Jang, JS; Jenkins, SJ; Jeon, SH; Jiang, M; Jo, HS; Jonsson, P; Joo, KK; Kajita, T; Kakuno, H; Kameda, J; Kano, Y; Kalaczynski, P; Karlen, D; Kasperek, J; Kataoka, Y; Kato, A; Katori, T; Kazarian, N; Kearns, E; Khabibullin, M; Khotjantsev, A; Kikawa, T; Kikec, M; Kim, JH; Kim, JY; Kim, SB; Kim, SY; King, S; Kinoshita, T; Kisiel, J; Klekotko, A; Kobayashi, T; Koch, L; Koga, M; Koerich, L; Kolev, N; Konaka, A; Kormos, LL; Koshio, Y; Korzenev, A; Kotsar, Y; Kouzakov, KA; Kowalik, KL; Kravchuk, L; Kryukov, AP; Kudenko, Y; Kumita, T; Kurjata, R; Kutter, T; Kuze, M; Kwak, K; La Commara, M; Labarga, L; Lagoda, J; James, ML; Lamoureux, M; Laveder, M; Lavitola, L; Lawe, M; Learned, JG; Lee, J; Leitner, R; Lezaun, ; Lim, IT; Lindner, T; Litchfield, RP; Long, KR; Longhin, A; Loverre, P; Lu, X; Ludovici, L; Maekawa, Y; Magaletti, L; Magar, K; Mahn, K; Makida, Y; Malek, M; Malinsky, M; Marchi, T; Maret, L; Mariani, C; Marinelli, A; Martens, K; Marti, L; Martin, JF; Martin, D; Marzec, J; Matsubara, T; Matsumoto, R; Matsuno, S; Matusiak, M; Mazzucato, E; McCarthy, M; McCauley, N; McElwee, J; McGrew, C; Mefodiev, A; Medhi, A; Mehta, P; Mellet, L; Menjo, H; Mermod, P; Metelko, C; Mezzetto, M; Migenda, J; Migliozzi, P; Mijakowski, P; Miki, S; Miller, EW; Minakata, H; Minamino, A; Mine, S; Mineev, O; Mitra, A; Miura, M; Moharana, R; Mollo, CM; Mondal, T; Mongelli, M; Monrabal, F; Moon, DH; Moon, CS; Mora, FJ; Moriyama, S; Mueller, TA; Munteanu, L; Murase, K; Nagao, Y; Nakadaira, T; Nakagiri, K; Nakahata, M; Nakai, S; Nakajima, Y; Nakamura, K; Nakamura, K; Nakamura, H; Nakano, Y; Nakaya, T; Nakayama, S; Nakayoshi, K; Machado, LN; Naseby, CER; Navarro-Garcia, B; Needham, M; Nicholls, T; Niewczas, K; Nishimura, Y; Noah, E; Nova, F; Nugent, JC; Nunokawa, H; Obrebski, W; Ochoa-Ricoux, JP; O'Connor, E; Ogawa, N; Ogitsu, T; Ohta, K; Okamoto, K; O'Keeffe, HM; Okumura, K; Onishchuk, Y; Orozco-Luna, F; Oshlianskyi, A; Ospina, N; Ostrowski, M; O'Sullivan, E; O'Sullivan, L; Ovsiannikova, T; Oyama, Y; Ozaki, H; Pac, MY; Paganini, P; Palladino, ; Paolone, ; Pari, M; Parsa, S; Pasternak, J; Pastore, C; Pastuszak, G; Patel, DA; Pavin, M; Payne, D; Peña-Garay, C; Pidcott, C; Guerra, EP; Playfer, S; Pointon, BW; Popov, A; Popov, B; Porwit, K; Posiadala-Zezula, M; Poutissou, JM; Pozimski, J; Pronost, G; Prouse, NW; Przewlocki, P; Quilain, B; Quiroga, AA; Radicioni, E; Radics, B; Rajda, PJ; Renner, J; Rescigno, M; Retiere, F; Ricciardi, G; Riccio, C; Richards, B; Rondio, E; Rose, HJ; Roskovec, B; Roth, S; Rott, C; Rountree, SD; Rubbia, A; Ruggeri, AC; Ruggles, C; Russo, S; Rychter, A; Ryu, D; Sakashita, K; Samani, S; Sánchez, F; Sánchez, ML; Sanchez, MC; Sano, S; Santos, JD; Santucci, G; Sarmah, P; Sashima, ; Sato, K; Scott, M; Seiya, Y; Sekiguchi, T; Sekiya, H; Seo, JW; Seo, SH; Sgalaberna, D; Shaikhiev, A; Shan, Z; Shaykina, A; Shimizu, ; Shin, CD; Shinoki, M; Shiozawa, M; Sinnis, G; Skrobova, N; Skwarczynski, K; Smy, MB; Sobczyk, J; Sobel, HW; Soler, FJP; Sonoda, Y; Spina, R; Spisso, B; Spradlin, P; Stankevich, KL; Stawarz, L; Stellacci, SM; Stopa, K; Studenikin, A; Gomez, SLS; Suganuma, T; Suvorov, S; Suwa, Y; Suzuki, AT; Suzuki, SY; Suzuki, Y; Svirida, D; Svoboda, R; Taani, M; Tada, M; Takeda, A; Takemoto, Y; Takenaka, A; Taketa, A; Takeuchi, Y; Takhistov, ; Tanaka, H; Tanaka, HA; Tanaka, H; Tanaka, M; Tashiro, T; Thiesse, M; Thompson, LF; Toledo, J; Tomatani-Sánchez, AK; Tortone, G; Tsui, KM; Tsukamoto, T; Tzanov, M; Uchida, Y; Vagins, MR; Valder, S; Valentino, V; Vasseur, G; Vijayvargi, A; Vilela, C; Vinning, WGS; Vivolo, D; Vladisavljevic, T; Vogelaar, RB; Vyalkov, MM; Wachala, T; Walker, J; Wark, D; Wascko, MO; Wendell, RA; Wilkes, RJ; Wilking, MJ; Wilson, JR; Wronka, S; Xia, J; Xie, Z; Xin, T; Yamaguchi, Y; Yamamoto, K; Yanagisawa, C; Yano, T; Yen, S; Yershov, N; Yeum, DN; Yokoyama, M; Yonenaga, M; Yoo, J; Yu, ; Yu, M; Zakrzewski, T; Zaldivar, B; Zalipska, J; Zaremba, K; Zarnecki, G; Ziembicki, M; Zietara, K; Zito, M; Zsoldos, S

ASTROPHYSICAL JOURNAL Vol. 916 ( 1 ) 2021.7

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Language：English Publishing type：Research paper (scientific journal) Publisher：Astrophysical Journal

Core-collapse supernovae are among the most magnificent events in the observable universe. They produce many of the chemical elements necessary for life to exist and their remnants - neutron stars and black holes - are interesting astrophysical objects in their own right. However, despite millennia of observations and almost a century of astrophysical study, the explosion mechanism of core-collapse supernovae is not yet well understood. Hyper-Kamiokande is a next-generation neutrino detector that will be able to observe the neutrino flux from the next galactic core-collapse supernova in unprecedented detail. We focus on the first 500 ms of the neutrino burst, corresponding to the accretion phase, and use a newly-developed, high-precision supernova event generator to simulate Hyper-Kamiokande's response to five different supernova models. We show that Hyper-Kamiokande will be able to distinguish between these models with high accuracy for a supernova at a distance of up to 100 kpc. Once the next galactic supernova happens, this ability will be a powerful tool for guiding simulations toward a precise reproduction of the explosion mechanism observed in nature.

DOI： 10.3847/1538-4357/abf7c4

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Simulation study on the effects of diffractive collisions on the prediction of the observables in ultra-high-energy cosmic-ray experiments Reviewed Open Access

Ken Ohashi, Hiroaki Menjo, Yoshitaka Itow, Takashi Sako, Katsuaki Kasahara

Progress of Theoretical and Experimental Physics Vol. 2021 ( 3 ) 2021.3

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Language：English Publishing type：Research paper (scientific journal) Publisher：Oxford University Press (OUP)

<title>Abstract</title>
The mass composition of ultra-high-energy cosmic rays is important for understanding their origin. Owing to our limited knowledge of the hadronic interaction, the interpretations of the mass composition from observations include several open problems, such as the inconsistent interpretations of $\langle X_{\mathrm{max } }\rangle $ and $\langle X_{\mathrm{max } }^{\mu}\rangle $. Furthermore, a large difference between the predictions exists in the hadronic interaction models. Diffractive collision is one of the proposed sources of the uncertainty. In this paper, we discuss the effect of the detailed characteristics of diffractive collisions on the observables of ultra-high-energy cosmic-ray experiments, focusing on three detailed characteristics. These are the cross-sectional fractions of different collision types, the diffractive-mass spectrum, and diffractive-mass-dependent particle production from the diffractive dissociation system. We demonstrate that the current level of uncertainty in the cross-sectional fraction can affect $\langle X_{\mathrm{max } }\rangle $ by 8.9 $\mathrm{g/cm^2}$ and $\langle X_{\mathrm{max } }^{\mu}\rangle $ by 9.4 $\mathrm{g/cm^2}$, whereas the other details of diffractive collisions exhibit relatively minor effects.

DOI： 10.1093/ptep/ptab013

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Other Link： http://academic.oup.com/ptep/article-pdf/2021/3/033F01/36647718/ptab013.pdf
Neutron-antineutron oscillation search using a 0.37 megaton-years exposure of Super-Kamiokande Reviewed International coauthorship International journal Open Access

Abe, K; Bronner, C; Hayato, Y; Ikeda, M; Imaizumi, S; Ito, H; Kameda, J; Kataoka, Y; Miura, M; Moriyama, S; Nagao, Y; Nakahata, M; Nakajima, Y; Nakayama, S; Okada, T; Okamoto, K; Orii, A; Pronost, G; Sekiya, H; Shiozawa, M; Sonoda, Y; Suzuki, Y; Takeda, A; Takemoto, Y; Takenaka, A; Tanaka, H; Yano, T; Akutsu, R; Han, S; Kajita, T; Okumura, K; Tashiro, T; Wang, R; Xia, J; Bravo-Berguño, D; Labarga, L; Marti, LL; Zaldivar, B; Blaszczyk, FDM; Kearns, E; Gustafson, JD; Raaf, JL; Stone, JL; Wan, L; Wester, T; Bian, J; Griskevich, NJ; Kropp, WR; Locke, S; Mine, S; Smy, MB; Sobel, HW; Takhistov, ; Weatherly, P; Hill, J; Kim, JY; Lim, IT; Park, RG; Bodur, B; Scholberg, K; Walter, CW; Coffani, A; Drapier, O; El Hedri, S; Giampaolo, A; Gonin, M; Mueller, TA; Paganini, P; Quilain, B; Ishizuka, T; Nakamura, T; Jang, JS; Learned, JG; Anthony, LH; Sztuc, AA; Uchida, Y; Berardi, ; Catanesi, MG; Radicioni, E; Calabria, NF; Machado, LN; De Rosa, G; Collazuol, G; Iacob, F; Lamoureux, M; Ospina, N; Ludovici, L; Nishimura, Y; Cao, S; Friend, M; Hasegawa, T; Ishida, T; Kobayashi, T; Matsubara, T; Nakadaira, T; Jakkapu, M; Nakamura, K; Oyama, Y; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Nakano, Y; Shiozawa, T; Suzuki, AT; Takeuchi, Y; Yamamoto, S; Ali, A; Ashida, Y; Feng, J; Hirota, S; Ichikawa, AK; Kikawa, T; Mori, M; Nakaya, T; Wendell, RA; Yasutome, K; Fernandez, P; McCauley, N; Mehta, P; Pritchard, A; Tsui, KM; Fukuda, Y; Itow, Y; Menjo, H; Niwa, T; Sato, K; Tsukada, M; Mijakowski, P; Posiadala-Zezula, M; Jung, CK; Vilela, C; Wilking, MJ; Yanagisawa, C; Harada, M; Hagiwara, K; Horai, T; Ishino, H; Ito, S; Koshio, Y; Ma, W; Piplani, N; Sakai, S; Kuno, Y; Barr, G; Barrow, D; Cook, L; Goldsack, A; Samani, S; Simpson, C; Wark, D; Nova, F; Boschi, T; Di Lodovico, F; Sedgwick, SM; Taani, M; Zsoldos, S; Yang, JY; Jenkins, SJ; McElwee, JM; Thiesse, MD; Thompson, LF; Malek, M; Stone, O; Okazawa, H; Kim, SB; Yu, ; Nishijima, K; Koshiba, M; Ogawa, N; Iwamoto, K; Yokoyama, M; Martens, K; Vagins, MR; Kuze, M; Izumiyama, S; Tanaka, M; Yoshida, T; Inomoto, M; Ishitsuka, M; Matsumoto, R; Ohta, K; Shinoki, M; Martin, JF; Tanaka, HA; Towstego, T; Hartz, M; Konaka, A; de Perio, P; Prouse, NW; Pointon, BW; Chen, S; Xu, BD; Richards, B; Jamieson, B; Walker, J; Minamino, A; Okamoto, K; Pintaudi, G; Sasaki, R

PHYSICAL REVIEW D Vol. 103 ( 1 ) 2021.1

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As a baryon number violating process with ΔB=2, neutron-antineutron oscillation (n→n¯) provides a unique test of baryon number conservation. We have performed a search for n→n¯ oscillation with bound neutrons in Super-Kamiokande, with the full dataset from its first four run periods, representing an exposure of 0.37 Mton-years. The search used a multivariate analysis trained on simulated n→n¯ events and atmospheric neutrino backgrounds and resulted in 11 candidate events with an expected background of 9.3 events. In the absence of statistically significant excess, we derived a lower limit on n¯ appearance lifetime in O16 nuclei of 3.6×1032 years and on the neutron-antineutron oscillation time of τn→n¯>4.7×108 s at 90% C.L.

DOI： 10.1103/PhysRevD.103.012008

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LHCf plan for proton-oxygen collisions at LHC Open Access

O. Adriani et al. (LHCf Collaboration)

Proceedings of Science Vol. 395 page： 348 2021

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DOI： 10.22323/1.395.0348

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A simulation study for one-pion exchange contribution on very forward neutron productions in ATLAS-LHCf common events Open Access

Ken Ohashi, Hiroaki Menjo, Yoshitaka Itow, Takashi Sako

Proceedings of Science Vol. 395 page： 190 2021

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DOI： 10.22323/1.395.0190

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Upgrade of Honda atmospheric neutrino flux calculation with implementing recent hadron interaction measurements Open Access

Kazufumi Sato, Hiroaki Menjo, Yoshitaka Itow, Morihiro Honda

Proceedings of Science Vol. 395 page： 1210 2021

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DOI： 10.22323/1.395.1210

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Very-forward pi0 production cross section in proton-proton collisions at √s = 13 TeV measured with the LHCf experiment International coauthorship Open Access

Proceedings of Science Vol. 395 page： 386 2021

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DOI： 10.22323/1.395.0386

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Status and Prospects of the LHCf and RHICf experiments Open Access

H. Menjo, et al.

Proceedings of Science Vol. 395 page： 301 2021

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Authorship：Lead author,　Corresponding author Language：English Publishing type：Research paper (international conference proceedings)

DOI： 10.22323/1.395.0301

Open Access
Results from the LHCf Run II in proton-proton collisions at vs = 13 TeV International coauthorship International journal Open Access

Tiberio A., Adriani O., Berti E., Bonechi L., Bongi M., D'Alessandro R., Castellini G., Haguenauer M., Itow Y., Kasahara K., Kondo M., Matsubara Y., Menjo H., Muraki Y., Ohashi K., Papini P., Ricciarini S., Sako T., Sakurai N., Sato K., Shimizu Y., Tamura T., Torii S., Tricomi A., Turner W.C., Ueno M., Yoshida K.

Proceedings of Science Vol. 398 2021

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：Proceedings of Science

The LHCf experiment, at the Large Hadron Collider (LHC), consists of two small independent calorimeters placed 140 metres away, on opposite sides of the ATLAS interaction point (IP1). LHCf has the capability to measure zero-degree neutral particles, covering the pseudorapidity region above 8.4. By measuring the very-forward particle production rates at the highest energy possible at an accelerator, LHCf aims to improve our understanding of hadronic interactions in air-showers induced by ultra-high-energy cosmic rays in the atmosphere. This contribution will highlight recent results from Run II measurements with p-p collisions at 13 TeV. At first, the advantages of an ATLAS-LHCf combined analysis are discussed and a preliminary energy spectrum of very-forward photons produced in diffractive collisions as tagged by ATLAS is shown. The neutron energy spectrum measurements, for several pseudorapidity regions, are presented and compared with the predictions of various hadronic interaction models. From these measurements the average inelasticity of the collisions, which strongly affects the development of an air-shower, has also been extracted. Finally, the preliminary p0 Feynman-x and transverse momentum spectra, which affect the development of the electromagnetic component of an air-shower, are shown.

DOI： 10.22323/1.398.0105

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Search for proton decay via p → e+π0 and p → μ+π0 with an enlarged fiducial volume in Super-Kamiokande I-IV Reviewed International coauthorship International journal Open Access

Takenaka, A; Abe, K; Bronner, C; Hayato, Y; Ikeda, M; Imaizumi, S; Ito, H; Kameda, J; Kataoka, Y; Kato, Y; Kishimoto, Y; Marti, L; Miura, M; Moriyama, S; Mochizuki, T; Nagao, Y; Nakahata, M; Nakajima, Y; Nakayama, S; Okada, T; Okamoto, K; Orii, A; Pronost, G; Sekiya, H; Shiozawa, M; Sonoda, Y; Suzuki, Y; Takeda, A; Takemoto, Y; Tanaka, H; Yano, T; Akutsu, R; Han, S; Kajita, T; Okumura, K; Tashiro, T; Wang, R; Xia, J; Bravo-Berguño, D; Labarga, L; Fernandez, P; Zaldivar, B; Blaszczyk, FDM; Kearns, E; Raaf, JL; Stone, JL; Wan, L; Wester, T; Pointon, BW; Bian, J; Griskevich, NJ; Kropp, WR; Locke, S; Mine, S; Smy, MB; Sobel, HW; Takhistov, ; Weatherly, P; Ganezer, KS; Hill, J; Kim, JY; Lim, IT; Park, RG; Bodur, B; Scholberg, K; Walter, CW; Coffani, A; Drapier, O; El Hedri, S; Giampaolo, A; Gonin, M; Mueller, TA; Paganini, P; Quilain, B; Ishizuka, T; Nakamura, T; Jang, JS; Learned, JG; Matsuno, S; Anthony, LH; Litchfield, RP; Sztuc, AA; Uchida, Y; Berardi, ; Catanesi, MG; Radicioni, E; Calabria, NF; Machado, LN; De Rosa, G; Collazuol, G; Iacob, F; Lamoureux, M; Ospina, N; Ludovici, L; Nishimura, Y; Cao, S; Friend, M; Hasegawa, T; Ishida, T; Jakkapu, M; Kobayashi, T; Matsubara, T; Nakadaira, T; Nakamura, K; Oyama, Y; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Hasegawa, M; Isobe, Y; Miyabe, H; Nakano, Y; Shiozawa, T; Sugimoto, T; Suzuki, AT; Takeuchi, Y; Yamamoto, S; Ali, A; Ashida, Y; Feng, J; Hirota, S; Ichikawa, AK; Jiang, M; Kikawa, T; Mori, M; Nakamura, KE; Nakaya, T; Wendell, RA; Yasutome, K; McCauley, N; Mehta, P; Pritchard, A; Tsui, KM; Fukuda, Y; Itow, Y; Menjo, H; Niwa, T; Sato, K; Taani, M; Tsukada, M; Mijakowski, P; Frankiewicz, K; Jung, CK; Santucci, G; Vilela, C; Wilking, MJ; Yanagisawa, C; Fukuda, D; Harada, M; Hagiwara, K; Horai, T; Ishino, H; Ito, S; Koshio, Y; Ma, K; Piplani, N; Sakai, S; Sakuda, M; Takahira, Y; Xu, C; Kuno, Y; Barr, G; Barrow, D; Cook, L; Simpson, C; Wark, D; Nova, F; Boschi, T; Di Lodovico, F; Segwick, SM; Zsoldos, S; Yang, JY; Jenkins, SJ; McElwee, JM; Thiesse, MD; Thompson, LF; Okazawa, H; Choi, Y; Kim, SB; Yu, ; Nishijima, K; Koshiba, M; Iwamoto, K; Ogawa, N; Yokoyama, M; Goldsack, A; Martens, K; Vagins, MR; Kuze, M; Tanaka, M; Yoshida, T; Inomoto, M; Ishitsuka, M; Matsumoto, R; Ohta, K; Shinoki, M; Martin, JF; Nantais, CM; Tanaka, HA; Towstego, T; Hartz, M; Konaka, A; de Perio, P; Prouse, NW; Chen, S; Xu, BD; Posiadala-Zezula, M; Richards, B; Jamieson, B; Walker, J; Minamino, A; Okamoto, K; Pintaudi, G; Sasaki, R

PHYSICAL REVIEW D Vol. 102 ( 11 ) 2020.12

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Language：English Publishing type：Research paper (scientific journal) Publisher：Physical Review D

We have searched for proton decay via p→e+π0 and p→μ+π0 modes with the enlarged fiducial volume data of Super-Kamiokande from April 1996 to May 2018, which corresponds to 450 kton·years exposure. We have accumulated about 25% more livetime and enlarged the fiducial volume of the Super-Kamiokande detector from 22.5 kton to 27.2 kton for this analysis, so that 144 kton·years of data, including 78 kton·years of additional fiducial volume data, has been newly analyzed. No candidates have been found for p→e+π0 and one candidate remains for p→μ+π0 in the conventional 22.5 kton fiducial volume and it is consistent with the atmospheric neutrino background prediction. We set lower limits on the partial lifetime for each of these modes: τ/B(p→e+π0)>2.4×1034 years and τ/B(p→μ+π0)>1.6×1034 years at 90% confidence level.

DOI： 10.1103/PhysRevD.102.112011

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Indirect search for dark matter from the Galactic Center and halo with the Super-Kamiokande detector Reviewed International coauthorship International journal Open Access

Abe, K; Bronner, C; Haga, Y; Hayato, Y; Ikeda, M; Imaizumi, S; Ito, H; Iyogi, K; Kameda, J; Kataoka, Y; Kato, Y; Kishimoto, Y; Marti, L; Miura, M; Moriyama, S; Mochizuki, T; Nagao, Y; Nakahata, M; Nakajima, Y; Nakajima, T; Nakayama, S; Okada, T; Okamoto, K; Orii, A; Pronost, G; Sekiya, H; Shiozawa, M; Sonoda, Y; Takeda, A; Takenaka, A; Tanaka, H; Tasaka, S; Tomura, T; Ueno, K; Yano, T; Yokozawa, T; Akutsu, R; Han, S; Irvine, T; Kajita, T; Kametani, ; Lee, KP; McLachlan, T; Okumura, K; Richard, E; Tashiro, T; Wang, R; Xia, J; Bravo-Berguño, D; Labarga, L; Fernandez, P; Blaszczyk, FDM; Gustafson, J; Kachulis, C; Kearns, E; Raaf, JL; Stone, JL; Sulak, LR; Sussman, S; Wan, L; Wester, T; Berkman, S; Tobayama, S; Bian, J; Carminati, G; Elnimr, M; Griskevich, NJ; Kropp, WR; Locke, S; Mine, S; Renshaw, A; Smy, MB; Sobel, HW; Takhistov, ; Weatherly, P; Hartfiel, BL; Hill, J; Keig, WE; Hong, N; Kim, JY; Lim, IT; Park, RG; Akiri, T; Bodur, B; Himmel, A; Li, Z; O'Sullivan, E; Scholberg, K; Walter, CW; Wongjirad, T; Coffani, A; Drapier, O; El Hedri, S; Giampaolo, A; Gonin, M; Imber, J; Mueller, TA; Paganini, P; Quilain, B; Ishizuka, T; Nakamura, T; Jang, JS; Choi, K; Learned, JG; Matsuno, S; Smith, SN; Amey, J; Anthony, LH; Litchfield, RP; Sztuc, AA; Uchida, Y; Wascko, MO; Berardi, ; Catanesi, MG; Intonti, RA; Radicioni, E; Calabria, NF; Machado, LN; De Rosa, G; Collazuol, G; Iacob, F; Lamoureux, M; Ospina, N; Ludovici, L; Boschi, T; Di Lodovico, F; Sedgwick, SM; Zsoldos, S; Nishimura, Y; Cao, S; Friend, M; Hasegawa, T; Ishida, T; Ishii, T; Kobayashi, T; Nakadaira, T; Nakamura, K; Oyama, Y; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Abe, K; Hasegawa, M; Isobe, Y; Miyabe, H; Nakano, Y; Shiozawa, T; Sugimoto, T; Suzuki, AT; Takeuchi, Y; Yamamoto, S; Ali, A; Ashida, Y; Hayashino, T; Hiraki, T; Hirota, S; Huang, K; Ieki, K; Jiang, M; Kikawa, T; Mori, M; Murakami, A; Nakamura, KE; Nakaya, T; Patel, ND; Suzuki, K; Takahashi, S; Tateishi, K; Wendell, RA; McCauley, N; Mehta, P; Pritchard, A; Tsui, KM; Fukuda, Y; Itow, Y; Menjo, H; Mitsuka, G; Murase, M; Muto, F; Niwa, T; Sato, K; Suzuki, T; Taani, M; Tsukada, M; Mijakowski, P; Frankiewicz, K; Hignight, J; Jung, CK; Li, X; Palomino, JL; Santucci, G; Vilela, C; Wilking, MJ; Yanagisawa, C; Fukuda, D; Hagiwara, K; Harada, M; Horai, T; Ishino, H; Ito, S; Kayano, T; Kibayashi, A; Koshio, Y; Ma, W; Mori, T; Nagata, H; Piplani, N; Sakuda, M; Seiya, S; Takahira, Y; Xu, C; Yamaguchi, R; Kuno, Y; Barr, G; Barrow, D; Cook, L; Simpson, C; Wark, D; Nova, F; Tacik, R; Yang, JY; Cole, A; Jenkins, SJ; McElwee, J; Thiesse, M; Thompson, L; Okazawa, H; Kim, SB; Choi, Y; Ito, K; Nishijima, K; Iwamoto, K; Koshiba, M; Suda, Y; Yokoyama, M; Calland, RG; Goldsack, A; Martens, K; Murdoch, M; Suzuki, Y; Vagins, MR; Hamabe, D; Kuze, M; Okajima, Y; Tanaka, M; Yoshida, T; Inomoto, M; Ishitsuka, M; Matsumoto, R; Ohta, K; Shinoki, M; Martin, JF; Nantais, CM; Tanaka, HA; Towstego, T; Hartz, M; Konaka, A; de Perio, P; Prouse, NW; Chen, S; Xu, BD; Zhang, Y; Richards, B; Connolly, K; Wilkes, RJ; Jamieson, B; Walker, J; Giorgio, P; Minamino, A; Pintaudi, G

PHYSICAL REVIEW D Vol. 102 ( 7 ) 2020.10

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We present a search for an excess of neutrino interactions due to dark matter in the form of weakly interacting massive particles (WIMPs) annihilating in the Galactic center or halo based on the data set of Super-Kamiokande-I, -II, -III and -IV taken from 1996 to 2016. We model the neutrino flux, energy, and flavor distributions assuming WIMP self-annihilation is dominant to νν¯, μ+μ-, bb¯, or W+W-. The excess is in comparison to atmospheric neutrino interactions which are modeled in detail and fit to data. Limits on the self-annihilation cross section σ are derived for WIMP masses in the range 1 GeV to 10 TeV, reaching as low as 9.6×10-23 cm3 s-1 for 5 GeV WIMPs in bb¯ mode and 1.2×10-24 cm3 s-1 for 1 GeV WIMPs in νν¯ mode. The obtained sensitivity of the Super-Kamiokande detector to WIMP masses below several tens of GeV is the best among similar indirect searches to date.

DOI： 10.1103/PhysRevD.102.072002

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Measurement of energy flow, cross section and average inelasticity of forward neutrons produced in $$ \sqrt{s} $$ = 13 TeV proton-proton collisions with the LHCf Arm2 detector Reviewed International coauthorship International journal Open Access

O. Adriani, E. Berti, L. Bonechi, M. Bongi, R. D’Alessandro, S. Detti, M. Haguenauer, Y. Itow, K. Kasahara, H. Menjo, Y. Muraki, K. Ohashi, P. Papini, S. Ricciarini, T. Sako, N. Sakurai, K. Sato, T. Tamura, A. Tiberio, S. Torii, A. Tricomi, W.C. Turner, M. Ueno

Journal of High Energy Physics Vol. 2020 ( 7 ) 2020.7

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Language：English Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

DOI： 10.1007/JHEP07(2020)016

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Transverse single-spin asymmetry for very forward neutral pion production in polarized $p+p$ collisions at $\sqrt{s} = 510$ GeV Reviewed International coauthorship International journal Open Access

Kim, M.H., Adriani, O., Berti, E., Bonechi, L., D'Alessandro, R., Goto, Y., Hong, B., Itow, Y., Kasahara, K., Menjo, H., Nakagawa, I., Park, J.S., Sako, T., Sakurai, N., Sato, K., Seidl, R., Tanida, K., Torii, S., Tricomi, A., Ueno, M., Makino, Y., Zhou, Q.D., Lee, J.H., Ljubicic, T., Ogawa, A.

Phys.Rev.Lett. Vol. 124 ( 25 ) page： 252501 - 252501 2020.6

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Language：English Publishing type：Research paper (scientific journal) Publisher：American Physical Society (APS)

DOI： 10.1103/PhysRevLett.124.252501

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PubMed

arXiv
Update of the atmospheric neutrino flux simulation ATMNC for next-generation neutrino experiment International coauthorship International journal Open Access

Sato K., Itow Y., Menjo H., Honda M.

16TH INTERNATIONAL CONFERENCE ON TOPICS IN ASTROPARTICLE AND UNDERGROUND PHYSICS (TAUP 2019) Vol. 1468 2020

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Language：English Publishing type：Research paper (international conference proceedings)

DOI： 10.1088/1742-6596/1468/1/012194

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LHCf program for run III International coauthorship International journal Open Access

Tiberio A., Adriani O., Berti E., Bonechi L., Bongi M., D’Alessandro R., Detti S., Haguenauer M., Itow Y., Kasahara K., Menjo H., Muraki Y., Ohashi K., Papini P., Ricciarini S., Sako T., Sakurai N., Sato K., Tamura T., Torii S., Tricomi A., Turner W.C., Ueno M.

Proceedings of Science Vol. 382 2020

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：Proceedings of Science

The LHC-forward (LHCf) experiment has measured the very forward neutral particle production cross section in proton-proton and proton-lead collisions at the LHC up to √s = 13 TeV and √sN N = 8.16 TeV, respectively. The experiment employs two independent detectors placed on opposite sides along the beam line approximately 140 meters away from the interaction point of the ATLAS experiment (IP1). The detectors are able to measure neutral particles with pseudorapidity greater than 8.4, up to zero-degree. These measurements are extremely useful for the calibration of the hadronic interaction models used to simulate the atmospheric showers of secondary particles induced from an high energy cosmic ray. Decreasing the uncertainty between different models it is possible to improve the precision of the high energy cosmic rays measurements. In this contribution the LHCf physics motivation for the Run III of LHC are discussed. The beam parameters and the expected operation time needed for our minimum physics program are described for both p-p run at 14 TeV and p-O run at 9.9 TeV. Finally, a brief summary of the ongoing upgrade on the Arm2 detector is given.

DOI： 10.22323/1.382.0089

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Recent results from the LHCf and RHICf experiments International coauthorship International journal Open Access

Itow, Y; Masuda, K; Menjo, H; Muraki, Y; Ohashi, K; Sato, K; Ueno, M; Zhou, QD; Sako, T; Kasahara, K; Suzuki, T; Torii, S; Tamura, T; Sakurai, N; Haguenauer, M; Turner, WC; Adriani, O; Berti, E; Bonechi, L; Bongi, M; D'Alessandro, R; Papini, P; Ricciarini, S; Tiberio, A; Tricomi, A; Goto, Y; Nakagawa, I; Seidl, R; Park, JS; Kim, MH; Tanida, K; Hong, B

XX INTERNATIONAL SYMPOSIUM ON VERY HIGH ENERGY COSMIC RAY INTERACTIONS (ISVHECRI 2018) Vol. 208 2019

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Language：English Publishing type：Research paper (international conference proceedings)

DOI： 10.1051/epjconf/201920805004

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Transverse single spin asymmetry for very forward π0 production in polarized proton-proton collisions at √s=510 GeV International coauthorship International journal Open Access

Kim, MH; Hong, B; Goto, Y; Nakagawa, I; Seidl, R; Park, JS; Tanida, K; Itow, Y; Menjo, H; Sato, K; Ueno, M; Zhou, QD; Sako, T; Kasahara, K; Suzuki, T; Torii, S; Sakurai, N; Adriani, O; Bonechi, L; Berti, E; D'Alessandro, R; Tricomi, A

XX INTERNATIONAL SYMPOSIUM ON VERY HIGH ENERGY COSMIC RAY INTERACTIONS (ISVHECRI 2018) Vol. 208 2019

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Language：English Publishing type：Research paper (international conference proceedings)

DOI： 10.1051/epjconf/201920805007

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Latest results of the LHCf experiment International coauthorship International journal Open Access

Berti E., Adriani O., Bonechi L., Bongi M., D'Alessandro R., Castellini G., Haguenauer M., Itow Y., Kasahara K., Matsubara Y., Menjo H., Muraki Y., Ohashi K., Papini P., Ricciarini S., Sako T., Sakurai N., Sato K., Shimizu Y., Silveri L., Tamura T., Tiberio A., Torii S., Tricomi A., Turner W.C., Ueno M., Yoshida K.

Proceedings of Science Vol. 364 2019

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：Proceedings of Science

The LHCf experiment is designed to provide precise measurements of the production spectra relative to neutral particles produced in the very forward region by high energy proton-proton and proton-ion collisions. This information is necessary in order to test and tune hadronic interaction models used by ground-based cosmic rays experiments. In order to reach this goal, LHCf makes use of two small sampling calorimeters installed in the LHC tunnel at ±140 m from IP1, both able to detect neutral particles having pseudo-rapidity η > 8.4. In LHC Run II, LHCf acquired data relative to p-p collisions at √s = 13 TeV and p-Pb collisions at √sNN = 8.1 TeV. In this paper, we discuss the results obtained from p-p collisions at √s = 13 TeV, focusing in particular on photon and neutron production, the two analyses already published by the collaboration.

DOI： 10.22323/1.364.0034

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The LHCf experiment: Recent physics results International coauthorship International journal Open Access

Berti E., Adriani O., Bonechi L., Bongi M., D'Alessandro R., Haguenauer M., Itow Y., Kasahara K., Makino Y., Masuda K., Menjo H., Muraki Y., Ohashi K., Papini P., Ricciarini S., Sako T., Sakurai N., Sato K., Shinoda M., Suzuki T., Tamura T., Tiberio A., Torii S., Tricomi A., Turner W.C., Ueno M., Zhou Q.D.

Proceedings of Science Vol. 340 2019

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：Proceedings of Science

The main aim of the LHCf experiment is to provide precise measurements of the production spectra relative to neutral particles produced in the very forward region by high energy protonproton and proton-ion collisions. This information is necessary in order to test and tune hadronic interaction models used by ground-based cosmic rays experiments. In order to reach this goal, LHCf makes use of two small sampling calorimeters installed in the LHC tunnel at ±140 m from IP1, able to detect neutral particles having pseudo-rapidity η > 8:4. After the operations relative to p-p collisions at √s = 13 TeV, the collaboration focused the activity on the study of forward photons and neutrons production at this energy. In this paper, we discuss the recent results relative to the photons analysis, regarding, in particular, the inclusive production cross section, the role of diffractive and non-diffractive processes in forward photons production (investigated thanks to the LHCf-ATLAS joint analysis) and the forward differential energy flow.

DOI： 10.22323/1.340.0207

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The energy spectrum of forward photons measured by the RHICf experiment in vs = 510 GeV proton-proton collisions International coauthorship International journal Open Access

K. Sato, Y. Itow, H. Menjo, M. Ueno, K. Ohashi, T. Sako, Y. Goto, I. Nakagawa, R. Saidl, J. S. Park, M. H. Kim, B. Hong, K. Tanida, S. Torii, K. Kasahara, N. Sakurai, O. Adriani, R. D'Alessandro, L. Bonechi, E. Berti, A. Tricomi

Proceedings of Science Vol. 358 2019

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DOI： 10.22323/1.358.0413

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Scopus
MC study for the effect of diffractive events on air shower developments International journal Open Access

Ohashi K., Menjo H., Itow Y.

Proceedings of Science Vol. 356 2019

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The origin of ultra-high energy cosmic rays is unknown and the mass composition is one of the key observables to understand the origin. The mass composition is estimated by comparing a prediction of the depth of maximum of shower developments, X<inf>max</inf>, with experimental data, how-ever, the X<inf>max</inf> prediction depends on the choice of hadronic interaction modes in the simulation. One of the proposed sources of the difference is the different modeling of diffractive collisions among the models. In this work, we estimate the effect of detail of diffractive collisions at the first interaction of cosmic-rays with atmospheric nuclei on the air shower developments by using the air shower simulation package COSMOS 8.035. The results show that the modeling of diffractive collisions at the first interaction is not the main source of the model discrepancies of the X<inf>max</inf> prediction.

DOI： 10.22323/1.356.0026

Open Access

Scopus
Measurement of inclusive forward neutron production cross section in proton-proton collisions at root s=13 TeV with the LHCf Arm2 detector Open Access

Adriani O, Berti E, Bonechi L, Bongi M, D'Alessandro R, Detti S, Haguenauer M, Itow Y, Kasahara K, Makino Y, Masuda K, Menjo H, Muraki Y, Ohashi K, Papini P, Ricciarini S, Sako T, Sakurai N, Sato K, Shinoda M, Suzuki T, Tamura T, Tiberio A, Torii S, Tricomi A, Turner W. C, Ueno M, Zhou Q. D

JOURNAL OF HIGH ENERGY PHYSICS Vol. 2018 ( 11 ) 2018.11

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DOI： 10.1007/JHEP11(2018)073

Open Access

Web of Science

Scopus
Measurement of forward photon production cross-section in proton-proton collisions at root s=13 TeV with the LHCf detector Reviewed International coauthorship International journal Open Access

Adriani O, Berti E, Bonechi L, Bongi M, D'Alessandro R, Haguenauer M, Itow Y, Iwata T, Kasahara K, Makino Y, Masuda K, Matsubayashi E, Menjo H, Muraki Y, Papini R, Ricciarini S, Sako T, Sakurai N, Shinoda M, Suzuki T, Tamura T, Tiberio A, Torii S, Tricomi A, Turner W. C, Ueno M, Zhou Q. D

PHYSICS LETTERS B Vol. 780 page： 233 - 239 2018.5

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DOI： 10.1016/j.physletb.2017.12.050

Open Access

Web of Science

Scopus
RHIC forward experiment to study √ s dependence of forward particle production Reviewed International coauthorship International journal Open Access

T. Sako, O. Adriani, L. Bonechi, R. D'Alessandro, Y. Goto, Y. Itow, K. Kasahara, M. Kim, Y. Makino, E. Matsubayashi, H. Menjo, I. Nakagawa, J. Park, N. Sakurai, K. Sato, R. Seidl, M. Shinoda, T. Suzuki, K. Tanida, S. Torii, A. Tricomi, M. Ueno, Q. D. Zhou

EPJ Web of Conferences Vol. 145 2017.6

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Language：English Publishing type：Research paper (international conference proceedings) Publisher：EDP Sciences

DOI： 10.1051/epjconf/201614510005

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Scopus
Monte Carlo study of particle production in diffractive proton-proton collisions at root s=13 TeV with the very forward detector combined with central information Reviewed International journal Open Access

Zhou Qi-Dong, Itow Yoshitaka, Menjo Hiroaki, Sako Takashi

EUROPEAN PHYSICAL JOURNAL C Vol. 77 ( 4 ) page： 212 2017.4

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DOI： 10.1140/epjc/s10052-017-4788-7

Open Access

Web of Science

Scopus

arXiv
Performance study for the photon measurements of the upgraded LHCf calorimeters with Gd2SiO5 (GSO) scintillators Reviewed International coauthorship International journal

Makino Y, Tiberio A, Adriani O, Berti E, Bonechi L, Bongi M, Caccia Z, D'Alessandro R, Del Prete M, Detti S, Haguenauer M, Itow Y, Iwata T, Kasahara K, Masuda K, Matsubayashi E, Menjo H, Mitsuka G, Muraki Y, Papini P, Ricciarini S, Sako T, Sakurai N, Suzuki T, Tamura T, Torii S, Tricomi A, Turner W. C, Ueno M, Zhou Q. D

JOURNAL OF INSTRUMENTATION Vol. 12 ( 3 ) 2017.3

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DOI： 10.1088/1748-0221/12/03/P03023

Web of Science

Scopus
The performance for the TeV photon measurement of the LHCf upgraded detector using Gd2SiO5 (GSO) scintillators Reviewed International coauthorship International journal

Makino Y, Adriani O, Berti E, Bonechi L, Bongi M, Castellini G, D'Alessandro R, Haguenauer M, Itow Y, Iwata T, Kasahara K, Masuda K, Matsubayashi E, Menjo H, Muraki Y, Papini P, Ricciarini S, Sako T, Suzuki T, Tamura T, Tiberio A, Torii S, Tricomi A, Turner W. C, Ueno M, Zhou Q. D

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT Vol. 845 page： 490 - 493 2017.2

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DOI： 10.1016/j.nima.2016.04.074

Web of Science

Scopus
The LHCf experiment: Forward particles production spectra at LHC Reviewed International coauthorship International journal Open Access

Berti E., Adriani O., Bonechi L., Bongi M., Castellini G., D'Alessandro R., Haguenauer M., Itow Y., Iwata Y., Kasahara K., Makino Y., Masuda K., Matsubayashi E., Menjo H., Muraki Y., Papini P., Ricciarini S., Sako T., Suzuki T., Tamura T., Tiberio A., Torii S., Tricomi A., Turner W. C., Ueno M., Zhou Q. D.

NUOVO CIMENTO C-COLLOQUIA AND COMMUNICATIONS IN PHYSICS Vol. 40 ( 1 ) 2017.1

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Language：English Publishing type：Research paper (international conference proceedings)

DOI： 10.1393/ncc/i2017-17013-x

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Web of Science

Scopus
Results of the LHCf experiment and the forward measurements at the LHC International coauthorship International journal Open Access

Sako, T; Adriani, O; Berti, E; Bonechi, L; Bongi, M; Castellini, G; D'Alessandro, R; Haguenauer, M; Itow, Y; Iwata, T; Kasahara, K; Masuda, K; Matsubayashi, E; Menjo, H; Muraki, Y; Papini, P; Ricciarini, S; Sakurai, N; Sato, K; Shinoda, M; Suzuki, T; Tamura, T; Tiberio, A; Torii, T; Tricomi, A; Turner, WC; Ueno, M; Zhou, QD

ISVHECRI 2016 - XIX INTERNATIONAL SYMPOSIUM ON VERY HIGH ENERGY COSMIC RAY INTERACTIONS Vol. 145 2017

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Language：English Publishing type：Research paper (international conference proceedings)

DOI： 10.1051/epjconf/201714509002

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Web of Science
RHIC forward experiment to study √s dependence of forward particle production International coauthorship International journal Open Access

Sako, T; Adriani, O; Bonechi, L; D'Alessandro, R; Goto, Y; Itow, Y; Kasahara, K; Kim, M; Makino, Y; Matsubayashi, E; Menjo, H; Nakagawa, I; Park, J; Sakurai, N; Sato, K; Seidl, R; Shinoda, M; Suzuki, T; Tanida, K; Torii, S; Tricomi, A; Ueno, M; Zhou, QD

ISVHECRI 2016 - XIX INTERNATIONAL SYMPOSIUM ON VERY HIGH ENERGY COSMIC RAY INTERACTIONS Vol. 145 2017

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Language：English Publishing type：Research paper (international conference proceedings)

DOI： 10.1051/epjconf/201714510005

Open Access

Web of Science
Measurement of very forward particle production at RHIC with √s=510GeV proton-proton collisions Reviewed International coauthorship International journal Open Access

T. Sako, Y. Itow, Q. D. Zhou, M. Ueno, M. Shinoda, K. Sato, H. Menjo, Y. Goto, I. Nakagawa, R. Seidl, J. S. Park, M. H. Kim, K. Tanida, S. Torii, K. Kasahara, T. Suzuki, N. Sakurai, O. Adriani, R. D'Alessandro, L. Bonechi, E. Berti, A. Tricomi

Proceedings of Science 2017

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DOI： 10.22323/1.301.0337

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Scopus
Monte Carlo study of diffraction in proton-proton collisions at √s = 13 TeV with the very forward detector Reviewed International journal Open Access

Qi Dong Zhou, Yoshitaka Itow, Takashi Sako, Hiroaki Menjo

Proceedings of Science Vol. 2017-January 2017

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Language：English Publishing type：Research paper (international conference proceedings)

DOI： 10.22323/1.294.0066

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Scopus
LHCf Detector performance during the 2009-2010 LHC run Reviewed Open Access

O. Adriani, et al.

International Journal of Modern Physics A Vol. 28 ( 25 ) page： 1330036 2013.10

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DOI： 10.1142/S0217751X13300366
フィレンツェ，ポスドク体験記 Open Access

毛受弘彰

日本物理学会誌 Vol. 68 ( 9 ) page： 628 2013.9

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Authorship：Lead author Language：Japanese Publishing type：Research paper (bulletin of university, research institution)

イタリア国立原子核物理研究所フィレンツェセクションですごしたポスドク研究員時代の経験をイタリアの魅力いっぱいに記載されている。

DOI： 10.11316/butsuri.68.9_628

Open Access
Measurement of forward neutral pion transverse momentum spectra for √s = 7TeV proton-proton collisions at LHC Reviewed Open Access

O. Adriani. et al.

Physical Review D Vol. 86 ( 9 ) page： 092001 2012.11

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Measurement of the forward neutral pions at LHC 7TeV proton proton collisions.

DOI： 10.1103/PhysRevD.86.092001

Open Access
LHCf実験の最新成果 Reviewed

﨏隆志, 毛受弘彰

高エネルギーニュース Vol. 31 ( 2 ) page： 99-106 2012.7

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Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)

LHCf実験はLHC加速器を用いて超高エネルギー宇宙線研究に必須である高エネルギーハドロン相互作用を研究する実験である。LHCf実験の最新結果を紹介されている。
Monte Carlo study of forward π¹⁷ production spectra to be measured by the LHCf experiment for the purpose of benchmarking hadron interaction models at 10¹⁷ eV Reviewed

H. Menjo, et al.

Astroparticle Physics Vol. 612 ( 3 ) page： 513-520 2011.2

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Measurement of zero degree single photon energy spectra for √s = 7 TeV proton-proton collisions at LHC Reviewed

O. Adriani, et al.

Physics Letters B Vol. 703 page： 128-134 2011

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The LHCf detector at the CERN Large Hadron Collider Reviewed Open Access

O. Adriani, et al.

Journal of Instrumentation Vol. 08 ( 08 ) page： S08006 2008

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1088/1748-0221/3/08/S08006

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To the head of Papers.▲

MISC 10

The LHCf experiment: Forward particles production spectra at LHC

Berti E, Adriani O, Bonechi L, Bongi M, Castellini G, D'Alessandro R, Haguenauer M, Itow Y, Iwata Y, Kasahara K, Makino Y, Masuda K, Matsubayashi E, Menjo H, Muraki Y, Papini P, Ricciarini S, Sako T, Suzuki T, Tamura T, Tiberio A, Torii S, Tricomi A, Turner W. C, Ueno M, Zhou Q. D

NUOVO CIMENTO C-COLLOQUIA AND COMMUNICATIONS IN PHYSICS Vol. 40 ( 1 ) 2017

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Language：English Publishing type：Rapid communication, short report, research note, etc. (scientific journal)

DOI： 10.1393/ncc/i2017-17013-x

Scopus
Measurements of longitudinal and transverse momentum distributions for neutral pions in the forward-rapidity region with the LHCf detector Reviewed

Adriani O., Berti E., Bonechi L., Bongi M., D'Alessandro R., Del Prete M., Haguenauer M., Itow Y., Iwata T., Kasahara K., Kawade K., Makino Y., Masuda K., Matsubayashi E., Menjo H., Mitsuka G., Muraki Y., Papini P., Perrot A. -L., Ricciarini S., Sako T., Sakurai N., Suzuki T., Tamura T., Tiberio A., Torii S., Tricomi A., Turner W. C., Ueno M., Zhou Q. D.

PHYSICAL REVIEW D Vol. 94 ( 3 ) 2016.8

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DOI： 10.1103/PhysRevD.94.032007

Web of Science
Measurement of very forward neutron energy spectra for 7 TeV proton-proton collisions at the Large Hadron Collider Reviewed

Adriani O., Berti E., Bonechi L., Bongi M., Castellini G., D'Alessandro R., Del Prete M., Haguenauer M., Itow Y., Kasahara K., Kawade K., Makino Y., Masuda K., Matsubayashi E., Menjo H., Mitsuka G., Muraki Y., Okuno Y., Papini P., Perrot A. -L., Ricciarini S., Sako T., Sakurai N., Sugiura Y., Suzuki T., Tamura T., Tiberio A., Torii S., Tricomi A., Turner W. C., Zhou Q. D.

PHYSICS LETTERS B Vol. 750 page： 360-366 2015.11

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DOI： 10.1016/j.physletb.2015.09.041

Web of Science
Transverse-momentum distribution and nuclear modification factor for neutral pions in the forward-rapidity region in proton-lead collisions at root(NN)-N-S=5.02 TeV Reviewed

Adriani O., Berti E., Bonechi L., Bongi M., Castellini G., D'Alessandro R., Del Prete M., Haguenauer M., Itow Y., Kasahara K., Kawade K., Makino Y., Masuda K., Matsubayashi E., Menjo H., Mitsuka G., Muraki Y., Papini P., Perrot A. -L., Pfeiffer D., Ricciarini S., Sako T., Sakurai N., Suzuki T., Tamura T., Tiberio A., Torii S., Tricomi A., Turner W. C.

PHYSICAL REVIEW C Vol. 89 ( 6 ) 2014.6

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DOI： 10.1103/PhysRevC.89.065209

Web of Science
The performance of the LHCf detector for hadronic showers Reviewed

Kawade K., Adriani O., Bonechi L., Bongi M., Castellini G., D'Alessandro R., Del Prete M., Haguenauer M., Itow Y., Kasahara K., Makino Y., Masuda K., Matsubayashi E., Menjo H., Mitsuka G., Muraki Y., Papini P., Perrot A-L., Ricciarini S., Sako T., Sakurai N., Shimizu Y., Suzuki T., Tamura T., Torii S., Tricomi A., Turner W. C.

JOURNAL OF INSTRUMENTATION Vol. 9 2014.3

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DOI： 10.1088/1748-0221/9/03/P03016

Web of Science
Forward photon energy spectrum at LHC 7 TeV p-p collisions measured by LHCf Reviewed

Menjo H., Adriani O., Bongi M., Castellini G., D'Alessandro R., Fukatsu K., Haguenauer M., Itow Y., Kasahara K., Kawade K., Macina D., Mase T., Masuda K., Mitsuka G., Muraki Y., Nakai M., Noda K., Papini P., Perrot A. -L., Ricciarini S., Sako T., Shimizu Y., Suzuki K., Suzuki T., Taki K., Tamura T., Torri S., Tricomi A., Turner W. C.

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT Vol. 692 page： 224-227 2012.11

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DOI： 10.1016/j.nima.2011.12.071

Web of Science
Measurement of zero degree inclusive photon energy spectra for root s=900 GeV proton-proton collisions at LHC Reviewed

Adriani O., Bonechi L., Bongi M., Castellini G., D'Alessandro R., Fukatsu K., Haguenauer M., Iso T., Itow Y., Kasahara K., Kawade K., Mase T., Masuda K., Menjo H., Mitsuka G., Muraki Y., Noda K., Papini P., Perrot A. -L., Ricciarini S., Sako T., Suzuki K., Suzuki T., Taki K., Tamura T., Torii S., Tricomi A., Turner W. C.

PHYSICS LETTERS B Vol. 715 ( 4-5 ) page： 298-303 2012.9

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DOI： 10.1016/j.physletb.2012.07.065

Web of Science
Performance of the prototype detector for the LHCf experiment Reviewed

Sako T., Adriani O., Bonechi L., Bongi M., Faus A., Haguenauer M., Itow Y., Kasahara K., Masuda K., Matsubara Y., Matsumoto H., Menjo H., Muraki Y., Obata Y., Tamura T., Tanaka K., Torii S., Turner W. C., Velasco J., Yoshida K.

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT Vol. 578 ( 1 ) page： 146-159 2007.7

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DOI： 10.1016/j.nima.2007.05.267

Web of Science
High precision C-14 measurements and wiggle-match dating of tree rings at Nagoya University Reviewed

Nakamura Toshio, Miyahara Hiroko, Masuda Kimiaki, Menjo Hiroaki, Kuwana Kohsuke, Kimura Katsuhiko, Okuno Mitsuru, Minami Masayo, Oda Hirotaka, Rakowski Andrzej, Ohta Tomoko, Ikeda Akiko, Niu Etsuko

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS Vol. 259 ( 1 ) page： 408-413 2007.6

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DOI： 10.1016/j.nimb.2007.02.005

Web of Science
Cyclicity of solar activity during the Maunder minimum deduced from radiocarbon content Reviewed

Miyahara H, Masuda K, Muraki Y, Furuzawa H, Menjo H, Nakamura T

SOLAR PHYSICS Vol. 224 ( 1 ) page： 317-322 2004.10

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DOI： 10.1007/s11207-005-6501-5

Web of Science

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To the head of MISC.▲

Presentations 44

Very forward measurement by the RHICf experiment for high-energy cosmic ray physics Invited

2026.3.25

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Event date： 2026.3

Language：Japanese Presentation type：Oral presentation (invited, special)

Country：Japan
Status and Prospects of the LHCf experiment International coauthorship International conference

H. Menjo for the LHCf collaboration

ICRC 2025 2025.7.16

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Event date： 2025.7

Language：English Presentation type：Oral presentation (general)

Venue：Geneva Country：Switzerland
Study of cosmic-ray interaction using LHC

2024.9.18

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Event date： 2024.9

Language：Japanese Presentation type：Symposium, workshop panel (nominated)

Country：Japan
Status and Prospects of the LHCf experiment Invited International coauthorship International conference

Hiroaki Menjo for the LHCf Collaboration

22nd International Symposium on Very High Energy Cosmic Ray Interactions (ISVHECRI 2024) 2024.7.9

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Event date： 2024.7

Language：English Presentation type：Oral presentation (invited, special)

Venue：Puerto Vallarta Country：Mexico
Very forward hadron measurements with LHCf/RHICf detectors Invited International coauthorship International conference

Hiroaki Menjo for LHCf/RHICf Collaborations

3rd Forward Physics Facility Meeting 2021.10.26

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Event date： 2021.10

Language：English Presentation type：Oral presentation (invited, special)

Venue：Online Country：Switzerland
Status and Prospects of the LHCf and RHICf experiments International coauthorship International conference

Hiroaki Menjo for LHCf/RHICf Collaborations

37th ICRC (International Cosmic Ray Conference) 2021.7.18

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Event date： 2021.7

Language：English Presentation type：Oral presentation (general)

Venue：Online Country：Germany
LHCf実験における陽子-酸素原子核衝突測定 International coauthorship

毛受弘彰　他LHCfコラボレーション

日本物理学会2026年春季大会 2026.3.23 日本物理学会

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Event date： 2026.3

Language：Japanese Presentation type：Oral presentation (general)

Venue：オンライン Country：Japan
Very forward photon production in pp and p-Pb collisions measured by the LHCf experiment Invited International coauthorship International conference

H. Menjo for the LHCf collaboration

EMMI workshop: Soft photons 2025.5.26

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Event date： 2025.5

Language：English Presentation type：Oral presentation (invited, special)

Venue：Heidelberg Country：Germany
Preparation status for proton-oxygen collision measurement by LHCf International coauthorship

2025.3.19

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Event date： 2025.3

Language：Japanese Presentation type：Oral presentation (general)

Country：Japan
Status and prospects of the LHCf experiment Invited International coauthorship International conference

Hiroaki Menjo for the LHCf collaboration

The Hadronic Interaction Workshop 2025.3.19

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Event date： 2025.3

Language：English Presentation type：Oral presentation (invited, special)

Venue：Hong-Kong Country：China
LHCf実験によるLHC最前方中性粒子測定 Invited

毛受弘彰、他LHCfコラボレーション

Go Forward workshop 2025.2.27

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Event date： 2025.2 - 2025.3

Language：Japanese Presentation type：Oral presentation (invited, special)

Venue：長崎 Country：Japan
Status and Prospects for LHCf Invited International coauthorship International conference

Hiroaki Menjo for the LHCf Collaboration

Workshop of the EMMI Rapid Reaction Task Force on "Next Generation Facility for Forward Physics at the LHC" 2025.2.21

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Event date： 2025.2

Language：English Presentation type：Oral presentation (invited, special)

Venue：Heidelberg University Country：Germany
Recent results and Prospects of the LHCf experiment Invited International coauthorship International conference

Hiroaki Menjo for the LHCf Collaboration

New Trends of High-Energy and Low-x Physics 2024.9.2

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Event date： 2024.9

Language：English Presentation type：Oral presentation (invited, special)

Venue：Sfantu Gheorghe Country：Romania
Measuerment of pi0, eta and K0s measons with TeV energies by using LHCf detectors International coauthorship International conference

Hiroaki Menjo for the LHCf Collaboration

20th International Conference on Calorimetry in Particle Physics (CALOR 2024) 2024.5.21

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Event date： 2024.5

Language：English Presentation type：Poster presentation

Venue：Tsukuba Country：Japan
LHCf 陽子ー酸素原子核衝突測定に向けた準備状況 International coauthorship

毛受弘彰他LHCf Collaboration

日本物理学会 2024年春季大会 2024.3.18

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Event date： 2024.3

Language：Japanese Presentation type：Oral presentation (general)

Venue：オンライン Country：Japan
LHCf実験による LHCのビーム軸上でのハドロン測定 Invited International coauthorship

毛受弘彰他LHCf Collaboration

第21回高エネルギーQCD・格子構造勉強会 2023.11.1

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Event date： 2023.11

Language：Japanese Presentation type：Oral presentation (invited, special)

Venue：理化学研究所和光キャンパス Country：Japan
LHCf実験の最新結果と今後の展望 International coauthorship

毛受弘彰他LHCf Collaboration

日本物理学会第78回年次大会 2023.9

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Event date： 2023.9

Language：Japanese Presentation type：Oral presentation (general)

Venue：東北大学 Country：Japan
Performances of hadronic shower measurement at a joint operation of LHCf and ATLAS ZDC detectors International coauthorship International conference

H. Menjo for the LHCf collaboration and ATLAS ZDC group

38th International Cosmic Ray Conference (ICRC 2023) 2023.7

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Event date： 2023.7 - 2023.8

Language：English Presentation type：Poster presentation

Venue：Nagoya, Japan Country：Japan
Validation of Feynman scaling law using very forward photons measured with the RHICf detector International coauthorship International conference

H. Menjo for the RHICf collaboration

38th International Cosmic Ray Conference (ICRC 2023) 2023.7

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Event date： 2023.7 - 2023.8

Language：English Presentation type：Poster presentation

Venue：Nagoya, Japan Country：Japan
Measurement of very forward photon production cross-section at pp √s = 510 GeV with RHICf detector International coauthorship International conference

H. Menjo for the RHICf collaboration

ICHEP 2022 2023.7

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Event date： 2023.7

Language：English Presentation type：Poster presentation

Venue：Bologna, Italy (Hybrid) Country：Italy
最高エネルギー観測に期待すること Invited

毛受弘彰

研究会:次世代の最高エネルギー宇宙線観測の実現へ向けて 2023.5.20

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Event date： 2023.5

Language：Japanese Presentation type：Oral presentation (invited, special)

Venue：大阪電気電通大学 Country：Japan
LHCf: Very forward measurement at LHC Invited International coauthorship International conference

H. Menjo for LHCf collaboration

2nd International Workshop on Forward Physics and Forward Calorimeter Upgrade in ALICE 2023.3.15

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Event date： 2023.3

Language：English Presentation type：Oral presentation (invited, special)

Venue：Tsukuba, Japan Country：Japan
Recent results and Prospects of LHCf and RHICf Invited International coauthorship International conference

H. Menjo for LHCf and RHICf collaborations

The 5th KMI International Symposium (KMI2023 2023.2.21

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Event date： 2023.2

Language：English Presentation type：Oral presentation (invited, special)

Venue：Nagoya, Japan Country：Japan
Very forward particle measurements with LHCf and RHICf Invited International coauthorship International conference

H. Menjo for the LHCf and RHICf collaborations

21st International Symposium on Very High Energy Cosmic Ray Interactions (ISVHECRI 2022) 2022.5

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Event date： 2022.5

Language：English Presentation type：Oral presentation (invited, special)

Venue：Online
Multi-messenger astronomy in Super-Kamiokande Invited International coauthorship International conference

H. MENJO for SK Collaboration

Synergies at new frontiers at gamma-rays, neutrinos and gravitational waves 2022.3.25

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Event date： 2022.3

Language：English Presentation type：Oral presentation (invited, special)

Venue：ICRR, University of Tokyo, Japan Country：Japan
LHCf/RHICfによるトランジション領域における相互作用研究 International coauthorship

毛受弘彰 for LHCfコラボレーション

第5回空気シャワー観測による宇宙線の起源探索勉強会 2022.3.23

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Event date： 2022.3

Language：Japanese Presentation type：Oral presentation (general)

Venue：ハイブリッド（東大宇宙線研＋オンライン） Country：Japan

LHCf/RHICf実験を用いた相互作用研究による宇宙線銀河系内外のトランジション領域の物理解明への貢献についての講演。
次期pp衝突測定に向けたLHCf実験の準備状況 International coauthorship

毛受弘彰 for LHCfコラボレーション

日本物理学会第77回年次大会 2022.3.16

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Event date： 2022.3

Language：Japanese Presentation type：Oral presentation (general)

Venue：オンライン Country：Japan
スーパーカミオカンデにおける超新星爆発ニュートリノアラート Invited International coauthorship

毛受弘彰 for SKコラボレーション

第12回光赤外天文学大学間連携ワークショップ 2021.11.25

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Event date： 2021.11

Language：Japanese Presentation type：Oral presentation (invited, special)

Venue：オンライン Country：Japan

スーパーカミオカンデ実験における超新星爆発ニュートリノアラートについての講演を行った。
Future physics plan from RHICf International coauthorship International conference

Hiroaki Menjo for RHICf Collaboration

2021 RHIC/AGS Annual Users' Meeting 2021.6.8

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Event date： 2021.6

Language：English Presentation type：Oral presentation (general)

Venue：Online Country：United States
LHCf achievements at pp and pPb Invited International coauthorship International conference

Hiroaki Menjo for LHCf Collaboration

Opportunities of OO and pO collisions at the LHC 2021.2.10

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Event date： 2021.2

Language：English Presentation type：Oral presentation (invited, special)

Venue：Online Country：Switzerland
LHCf/RHICf の物理と検出器 Invited International coauthorship

毛受弘彰 for LHCf/RHICfコラボレーション

KEK研究会「素粒子・原子核コライダー物理の交点」 2020.8.31

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Event date： 2020.8 - 2020.9

Language：Japanese Presentation type：Oral presentation (invited, special)

Venue：オンライン Country：Japan

LHCf/RHICf実験の最新結果と将来計画についてのレビュー講演
LHCf: LHC forward experiment for CR interaction study International conference

LHCf collaboration

16th International Conference on Topics in Astroparticle and Undergraound Physics (TAUP2019)

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Event date： 2019.9

Language：English Presentation type：Oral presentation (general)

Venue：Toyama, Japan Country：Japan

The recent results and future prospects of the LHCf experiment, which is a very forward experiment of LHC, have been reported.
The results and future prospects of the LHCf experiment Invited International conference

LHCf collaboration

36th International Cosmic Ray Conference (ICRC2019)

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Event date： 2019.7 - 2019.8

Language：English Presentation type：Oral presentation (general)

Venue：Madison, USA Country：United States
Status of the LHCf experiment Invited International conference

LHCf collaboration

35th International Cosmic Ray Conference (ICRC2017)

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Event date： 2017.7

Language：English Presentation type：Oral presentation (invited, special)

Country：Korea, Republic of
Resent results from the LHCf experiment Invited International conference

LHCf collaboration

2016 International Conference on Ultra-High Energy Cosmic Rays (UHECR2016)

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Event date： 2016.10

Language：English Presentation type：Oral presentation (invited, special)

Venue：Kyoto, Japan Country：Japan
Forward photon energy spectrum at LHC 7TeV p-p collisions measured by LHCf International conference

Hiroaki Menjo, for the LHCf collaboration.

RICAP11( 3rd Roma International Conference on Astro-particle Physics)

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Event date： 2011.5

Language：English Presentation type：Oral presentation (general)

Country：Italy
LHCf実験の最新成果 International conference

毛受弘彰、他

日本物理学会2010年秋季大会

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Event date： 2010.9

Language：Japanese Presentation type：Oral presentation (invited, special)

Venue：九州工業大学 Country：Japan
Comparison of hadron interaction models with measurement of forward spectra by the LHCf apparatus International conference

H. MENJO for the LHCf collaboration

WISH2010 (International Workshop on Interplay between Soft and Hard interactions in particle production at ultra-relativistic energies)

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Event date： 2010.9

Language：English Presentation type：Oral presentation (general)

Country：Italy
Energy spectra measured by a LHC forward experiment : LHCf International conference

H. MENJO for the LHCf collaboration

ECRS 2010 (22nd European Cosmic Ray Symposium)

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Event date： 2010.9

Language：English Presentation type：Oral presentation (general)

Country：Finland
The status and preliminary results of the LHC forward experiment: LHCf International conference

H. MENJO for the LHCf collaboration

DIS2010 (XVIII International Workshop on Deep-Inelastic Scattering and Related Subjects)

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Event date： 2010.4

Language：English Presentation type：Oral presentation (general)

Country：Italy
The LHCf experiment International conference

H. MENJO for the LHCf collaboration

MC4LHC

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Event date： 2010.3 - 2010.4

Language：English Presentation type：Oral presentation (general)

Country：Switzerland
Simulation Study for the performance of the LHCf experiment International conference

H. MENJO for the LHCf collaboration

31st ICRC (International Cosmic Ray Conference)

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Event date： 2009.7

Language：English Presentation type：Poster presentation

Country：Poland
Status of the LHCf Experiment International conference

H. MENJO for the LHCf collaboration

30th ICRC (International Cosmic Ray Conference)

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Event date： 2007.7

Language：English Presentation type：Oral presentation (general)

Country：Mexico
The Performance of the LHCf Detectors International conference

H. MENJO for the LHCf collaboration

30th ICRC (International Cosmic Ray Conference)

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Event date： 2007.7

Language：English Presentation type：Poster presentation

Country：Mexico

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To the head of Presentations.▲

Research Project for Joint Research, Competitive Funding, etc. 2

Cosmic ray interactions in the knee and the highet energy regions

2021.4 - 2022.3

ICRR Inter-University Research Program

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Authorship：Principal investigator Grant type：Competitive

Grant amount：\143000 （ Direct Cost: \143000 ）
Neutrino search associated with astronominal transient events International coauthorship

2021.4 - 2022.3

ICRR Inter-University Research Program

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Authorship：Principal investigator Grant type：Competitive

Grant amount：\100000 （ Direct Cost: \100000 ）

To the head of Research Project for Joint Research, Competitive Funding, etc..▲

KAKENHI (Grants-in-Aid for Scientific Research) 10

Measurement of strange mesons at very forward region of LHC proton-proton collisions International coauthorship

Grant number：20H01917 2020.4 - 2023.3

Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Menjo Hiroaki

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Authorship：Principal investigator Grant type：Competitive

Grant amount：\17680000 （ Direct Cost: \13600000 、 Indirect Cost：\4080000 ）

An operation has been performed with proton-proton collisions at the center-of-mass collision energy of 13.6 TeV in September 2022. Thanks to upgrade of data-readout system and trigger logic, the data were collected more efficiently than that in the past operations, and 300 M event in total were obtained.
Including a 2015 operation data, we obtained results of differential production cross-section of eta meson. We found that QGSJET II model reproduced the result well. The eta/pi0 ratio showed mostly constant on the meson energy, and it indicate that a universal process produces such eta meson production.
Study of proton-pion interactions using proton-proton collisions at LHC and RHIC

Grant number：16K17692 2016.4 - 2019.3

Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)

Menjo Hiroaki, Zhou Quidong, Ohashi Ken, Adamczyk Leszek, Riehn Felix, Ostapchenko Sergey

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Authorship：Principal investigator Grant type：Competitive

Grant amount：\3770000 （ Direct Cost: \2900000 、 Indirect Cost：\870000 ）

We have successfully formed the joint analysis group of two LHC experiments, LHCf and ATLAS, for this unique measurement of proton-pion interaction study using proton-proton collisions. To understanding each experiment before going to this measurement, a simpler analysis has been performed, which is for measurement of diffractive-collision contribution on the forward photon production. Diffractive collisions are one of the main processes of proton-proton collisions. In these events, few particle are produced in the central region of collisions. Selecting no charged particle detection in the ATLAS detector, we analyzed LHCf photon events. Analysis of proton-pion interaction measurement is on-going and we will publish the result soon.
Measurement of very forward particles at LHC proton-oxygen collisions International coauthorship

Grant number：24K00660 2024.4 - 2027.3

Japan Society for the Promotion of Science Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

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Authorship：Principal investigator Grant type：Competitive

Grant amount：\18460000 （ Direct Cost: \14200000 、 Indirect Cost：\4260000 ）
Study of high energy cosmic-ray interactions using LHC proton-Oxygen collisions International coauthorship

Grant number：23KK0056 2023.9 - 2027.3

Grants-in-Aid for Scientific Research Fund for the Promotion of Joint International Research (International Collaborative Research)

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Authorship：Principal investigator Grant type：Competitive

Grant amount：\20930000 （ Direct Cost: \16100000 、 Indirect Cost：\4830000 ）
Research and elucidation of the origin of particle production in the very forward region of RHIC polarized proton collisions International coauthorship

Grant number：21H04484 2021.4 - 2025.3

Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

Goto Yuji

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Authorship：Coinvestigator(s) Grant type：Competitive

The development of a calorimeter detector using a new silicon detector planned in this project was delayed due to the shortage of silicon materials and equipment, but it was completed as a prototype detector that can be used in practical applications. Test beams at the ELPH facility at Tohoku University and the CERN-PS and SPS accelerators, and radiation tolerance tests at the RIKEN small neutron irradiation facility confirmed that sufficient performance for practical use was achieved.
The analysis of the experimental data at RHIC in 2017 went well, and the results or the asymmetry of neutral pions and neutrons and the photon production cross sections were published in scientific papers.The data analysis, in which the measured results are classified using the data from the STAR experimental detector, which is the main experiment installed, is in progress.
Integrated study in very forward productions in high energy cosmic ray interactions by colliders International coauthorship

Grant number：18H01227 2018.4 - 2021.3

Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Itow Yoshitaka

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Authorship：Coinvestigator(s) Grant type：Competitive

Towards the precise understanding of the air showers caused by ultra-high energy cosmic rays from the 10**14 to 10**17 electron volt regions, we have studied very-forward neutral particle productions in LHC 13TeV proton-proton collisions and in RHIC 510GeV polarized proton-proton collisions.
We have found good Feynman scaling in the very-forward gamma-ray productions by comparing the RHIC and the LHC data. We also discovered the transverse asymmetry of very-forward neutral pion productions in the RHIC transverse polarized collisions. We have also studied diffractive scattering by ATLAS-LHCf combined analysis, which is responsible for very forward particle production, and its effects on the development of air showers.
In addition, we have prepared for future measurements such as LHC Run-3 and proton-oxygen nuclear collisions at LHC and possible extension of RHICf-II.
LHC13TeV陽子衝突での超前方粒子生成とファイマンスケーリングの研究

2014.4 - 2018.3

科学研究費補助金基盤研究(A)

伊藤　好孝

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Authorship：Coinvestigator(s)
Study on very forward particle productions and their Feynman scaling in 13TeV p-p collisions at LHC

Grant number：26247037 2014.4 - 2018.3

Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

Itow Yoshitaka

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Authorship：Coinvestigator(s) Grant type：Competitive

Towards precise understanding of extensive air-showers, which are used for observation of ultra-high energy cosmic rays, measurements of very forward productions of gamma-rays, neutrons and neutral pions were performed. A study of hadronic interaction of cosmic rays was made for a wide range of energies from 10**14 eV to 10**17 eV, and for the Feynman scaling, scale invariance nature of very forward energy spectra independent on collision energies. In addition, the energy spectra of gamma-ray energy spectra each from diffractive and non-diffractive interactions were firstly obtained thanks to combined analysis with the ATLAS central detector.
LHC 軽原子核衝突超前方測定にむけたシリコンピクセルカロリーメータの開発

2013.4 - 2017.3

科学研究費補助金基盤研究(B)

さこ隆志

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Authorship：Coinvestigator(s)

2020年代のLHC軽原子核衝突での超前方測定を行うための検出器開発研究。シリコン検出器を用いてカロリーメータ型検出器を開発する
LHC 軽原子核衝突超前方測定にむけたシリコンピクセルカロリーメータの開発

2013.4 - 2017.3

日本学術振興会科学研究費助成事業基盤研究(B)

さこ隆志, 伊藤好孝, 増田公明, 田島宏康

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Authorship：Coinvestigator(s) Grant type：Competitive

2020年代のLHC軽原子核衝突での超前方測定を行うための検出器開発研究。シリコン検出器を用いてカロリーメータ型検出器を開発する

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To the head of KAKENHI (Grants-in-Aid for Scientific Research).▲

Teaching Experience (On-campus) 1

物理学実験

2025

To the head of Teaching Experience (On-campus).▲

Social Contribution 2

科学館イベント「科学者と3DVR映像で宇宙線空気シャワーを体験！」

Role(s)：Lecturer

大阪市科学館「科学者と3DVR映像で宇宙線空気シャワーを体験！」大阪市科学館 2026.2

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Audience： Schoolchildren,　Guardians

Type：Lecture
第32回公開セミナー「天文学の最前線」

Role(s)：Planner,　Organizing member

名古屋市科学館、名古屋大学理学部、宇宙地球環境研究所第32回公開セミナー「天文学の最前線」名古屋市科学館 2025.8

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Audience： High school students,　College students,　Graduate students,　Teachers,　Guardians,　General

Type：Lecture

To the head of Social Contribution.▲