研究者詳細 - 毛受　弘彰

論文 - 毛受　弘彰

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Measurement of the transverse single-spin asymmetry for forward neutron production in a wide <i>p</i><sub>T </sub>range in polarized <i>p</i> plus <i>p</i> collisions at √<i>s </i>=510 GeV 査読有り国際共著国際誌

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 109 巻 ( 1 ) 2024年1月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

Performance of RHICf detector during operation in 2017 査読有り国際共著国際誌 Open Access

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

JOURNAL OF INSTRUMENTATION 16 巻 ( 10 ) 2021年10月

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of Instrumentation

In the RHIC forward (RHICf) experiment, an operation with pp collisions was performed at √(s) = 510 GeV from 24-27 June 2017. The performances, energy and position resolutions, trigger efficiency, stability, and background during the operation, have been studied using data and simulations, which revealed that the requirements for production cross-section and transverse single-spin asymmetry measurements of very forward photons, π0s, and neutrons were satisfied. In this paper, we describe the details of these studies.

DOI： 10.1088/1748-0221/16/10/P10027

Simulation study on the effects of diffractive collisions on the prediction of the observables in ultra-high-energy cosmic-ray experiments 招待有り査読有り国際誌 Open Access

Ohashi, K; Menjo, H; Itow, Y; Sako, T; Kasahara, K

PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS 2021 巻 ( 3 ) 2021年3月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Progress of Theoretical and Experimental Physics

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 〈Xmax〉 and 〈Xmaxμ〉. 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 〈Xmax〉 by 8.9 g/cm2 and 〈Xmaxμ〉 by 9.4 g/cm2, whereas the other details of diffractive collisions exhibit relatively minor effects.

DOI： 10.1093/ptep/ptab013

Measurement of energy flow, cross section and average inelasticity of forward neutrons produced in √s=13 TeV proton-proton collisions with the LHCf Arm2 detector 査読有り国際共著国際誌 Open Access

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; Tiberio, A; Torii, S; Tricomi, A; Turner, WC; Ueno, M

JOURNAL OF HIGH ENERGY PHYSICS 2020 巻 ( 7 ) 2020年7月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of High Energy Physics

In this paper, we report the measurement of the energy flow, the cross section and the average inelasticity of forward neutrons (+ antineutrons) produced in s = 13 TeV proton-proton collisions. These quantities are obtained from the inclusive differential production cross section, measured using the LHCf Arm2 detector at the CERN Large Hadron Collider. The measurements are performed in six pseudorapidity regions: three of them (η > 10.75, 8.99 < η < 9.21 and 8.80 < η < 8.99), albeit with smaller acceptance and larger uncertainties, were already published in a previous work, whereas the remaining three (10.06 < η < 10.75, 9.65 < η < 10.06 and 8.65 < η < 8.80) are presented here for the first time. The analysis was carried out using a data set acquired in June 2015 with a corresponding integrated luminosity of 0.194 nb−1. Comparing the experimental measurements with the expectations of several hadronic interaction models used to simulate cosmic ray air showers, none of these generators resulted to have a satisfactory agreement in all the phase space selected for the analysis. The inclusive differential production cross section for η > 10.75 is not reproduced by any model, whereas the results still indicate a significant but less serious deviation at lower pseudorapidities. Depending on the pseudorapidity region, the generators showing the best overall agreement with data are either SIBYLL 2.3 or EPOS-LHC. Furthermore, apart from the most forward region, the derived energy flow and cross section distributions are best reproduced by EPOS-LHC. Finally, even if none of the models describe the elasticity distribution in a satisfactory way, the extracted average inelasticity is consistent with the QGSJET II-04 value, while most of the other generators give values that lie just outside the experimental uncertainties. [Figure not available: see fulltext.].

DOI： 10.1007/JHEP07(2020)016

Transverse Single-Spin Asymmetry for Very Forward Neutral Pion Production in Polarized <i>p</i> plus <i>p</i> Collisions at √<i>s</i>=510 GeV 査読有り国際共著国際誌 Open Access

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

PHYSICAL REVIEW LETTERS 124 巻 ( 25 ) 頁： 252501 2020年6月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Physical Review Letters

Transverse single-spin asymmetries of very forward neutral pions generated in polarized p+p collisions allow us to understand the production mechanism in terms of perturbative and nonperturbative strong interactions. During 2017, the RHICf Collaboration installed an electromagnetic calorimeter in the zero-degree region of the STAR detector at the Relativistic Heavy Ion Collider (RHIC) and measured neutral pions produced at pseudorapidity larger than 6 in polarized p+p collisions at s=510 GeV. The large nonzero asymmetries increasing both in longitudinal momentum fraction xF and transverse momentum pT have been observed at low transverse momentum pT<1 GeV/c for the first time, at this collision energy. The asymmetries show an approximate xF scaling in the pT region where nonperturbative processes are expected to dominate. A non-negligible contribution from soft processes may be necessary to explain the nonzero neutral pion asymmetries.

DOI： 10.1103/PhysRevLett.124.252501

Measurement of forward photon production cross-section in proton-proton collisions at √<i>s</i>=13 TeV with the LHCf detector 査読有り国際共著国際誌 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, WC; Ueno, M; Zhou, QD

PHYSICS LETTERS B 780 巻頁： 233 - 239 2018年5月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

In this paper, we report the production cross-section of forward photons in the pseudorapidity regions of η>10.94 and 8.99>η>8.81, measured by the LHCf experiment with proton–proton collisions at s=13TeV. The results from the analysis of 0.191nb−1 of data obtained in June 2015 are compared to the predictions of several hadronic interaction models that are used in air-shower simulations for ultra-high-energy cosmic rays. Although none of the models agree perfectly with the data, EPOS-LHC shows the best agreement with the experimental data among the models.

DOI： 10.1016/j.physletb.2017.12.050

Monte Carlo study of particle production in diffractive proton-proton collisions at √<i>s</i>=13 TeV with the very forward detector combined with central information 査読有り国際誌 Open Access

Zhou, QD; Itow, Y; Menjo, H; Sako, T

EUROPEAN PHYSICAL JOURNAL C 77 巻 ( 4 ) 頁： 212 2017年4月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：European Physical Journal C

Very forward (VF) detectors in hadron colliders, having unique sensitivity to diffractive processes, can be a powerful tool for studying diffractive dissociation by combining them with central detectors. Several Monte Carlo simulation samples in p–p collisions at s=13 TeV were analyzed, and different nondiffractive and diffractive contributions were clarified through differential cross sections of forward neutral particles. Diffraction selection criteria in the VF-triggered-event samples were determined by using the central track information. The corresponding selection applicable in real experiments has ≈ 100% purity and 30–70% efficiency. Consequently, the central information enables classification of the forward productions into diffraction and nondiffraction categories; in particular, most of the surviving events from the selection belong to low-mass diffraction events at log 10(ξx) < - 5.5. Therefore, the combined method can uniquely access the low-mass diffraction regime experimentally.

DOI： 10.1140/epjc/s10052-017-4788-7

The performance for the TeV photon measurement of the LHCf upgraded detector using Gd<sub>2</sub>SiO<sub>5</sub> (GSO) scintillators 査読有り国際共著国際誌

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, WC; Ueno, M; Zhou, QD

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 845 巻頁： 490 - 493 2017年2月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

The Large Hadron Collider forward (LHCf) experiment measures the forward particle production at the LHC to verify hadronic interaction models used in air shower experiments. We have upgraded very small sampling and imaging calorimeters using GSO scintillators to measure the most energetic particles generated in s=13 TeV p–p collisions at the zero-degree region of the LHC. Upgraded detectors were calibrated at the SPS North area facility in CERN and it was confirmed that the detector can measure electro-magnetic showers with energy resolution of 3% and position resolution of better than 123 μm for 100 GeV electrons. The operation of LHCf in 13 TeV p–p collisions has been successfully completed with integrated luminosity of 5 nb−1. Reconstructed π0 peak with the mass resolution of 3.7% and stability less than 1% during the operation implies that our measurement was stable enough in the high irradiation condition.

DOI： 10.1016/j.nima.2016.04.074

First Joint Oscillation Analysis of Super-Kamiokande Atmospheric and T2K Accelerator Neutrino Data 査読有り国際共著国際誌 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; 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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 134 巻 ( 1 ) 頁： 011801 2025年1月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

Measurements of the charge ratio and polarization of cosmic-ray muons with the Super-Kamiokande detector 査読有り国際共著国際誌 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 110 巻 ( 8 ) 2024年10月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

Development of a Data Overflow Protection System for Super-Kamiokande to Maximize Data from Nearby Supernovae 査読有り国際共著国際誌 Open Access

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 2024 巻 ( 10 ) 2024年10月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

Combined Pre-supernova Alert System with KamLAND and Super-Kamiokande 査読有り国際共著国際誌 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 973 巻 ( 2 ) 2024年10月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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 ⊙ 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

Development of a general purpose air shower simulation tool COSMOS X 国際誌 Open Access

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

Proceedings of Science 444 巻 2024年9月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：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

First result of a search for Diffuse Supernova Neutrino Background in SK-Gd experiment 国際共著国際誌 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 444 巻 2024年9月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：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

Evaluation of neutron tagging efficiency on 0.03% Gd mass concentration in SK-Gd experiment 国際共著国際誌 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 444 巻 2024年9月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：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

Measurement of cosmogenic <sup>9</sup>Li in Super-Kamiokande with gadolinium loaded water 国際共著国際誌 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 444 巻 2024年9月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：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

Time-dependent and Time-independent Directional Search for High-Energy Astrophysical Neutrino Point Sources in Super-Kamiokande 国際共著国際誌 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 444 巻 2024年9月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：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 νμ and νe 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

The LHCf experiment at the Large Hadron Collider: status and prospects 国際共著国際誌 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 444 巻 2024年9月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：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

Study of the neutrino-oxygen neutral-current quasielastic cross section using atmospheric neutrinos in the SK-Gd experiment 査読有り国際共著国際誌 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 444 巻 2024年9月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：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.) +−0.860.16(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

Status and Prospect of SK-Gd Project 国際共著国際誌 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 444 巻 2024年9月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：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

Search for Boosted Dark Matter in Super-Kamiokande with low-energy electrons 国際共著国際誌 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 444 巻 2024年9月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：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

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

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

Proceedings of Science 444 巻 2024年9月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：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

Performances of the LHCf Arm1 detector during √s=13.6 TeV p- p operation in 2022 国際共著国際誌 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 444 巻 2024年9月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：Proceedings of Science

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

Measurement of the very forward π<sup>0</sup> and η meson productions in p-p collisions at <sup>√</sup>s = 13 TeV with the LHCf detector 国際共著国際誌 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 444 巻 2024年9月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：Proceedings of Science

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

Measurement of the kaon to pion production ratio with the Super-Kamiokande 国際共著国際誌 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 444 巻 2024年9月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：Proceedings of Science

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 rK/π is measured with the correlation coefficient αT between the cosmic-ray muon rate in the underground detector and the atmospheric temperature. As a result, we obtained the correlation coefficient rK/π = 0.85 ± 0.01 (statistical uncertainty only) and rK/π = 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

Measurement of the charge ratio and polarization of cosmic-ray muon using the tagged decay-e events in Super-Kamiokande 国際共著国際誌 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 444 巻 2024年9月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：Proceedings of Science

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 (Pμ0) 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 Pμ0 = 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

New methods and simulations for cosmogenic induced spallation removal in Super-Kamiokande-IV 査読有り国際共著国際誌

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 G.D., Bravo-Berguño D., Labarga L., Marti L., Zaldivar B., Pointon B.W., Blaszczyk F.D.M., Kearns E., Raaf J.L., Stone J.L., Wan L., Wester T., Bian J., Griskevich N.J., Kropp W.R., Mine S., Smy M.B., Sobel H.W., Takhistov V., Weatherly P., Yankelevich A., Hill J., Kim J.Y., Lim I.T., Park R.G., Bodur B., Scholberg K., Walter C.W., Bernard L., Drapier O., Hedri S.E., Giampaolo A., Gonin M., Mueller T.A., Paganini P., Quilain B., Santos A.D., Ishizuka T., Nakamura T., Jang J.S., Learned J.G., Anthony L.H.V., Sztuc A.A., Uchida Y., Martin D., Scott M., Berardi V., Catanesi M.G., Radicioni E., Calabria N.F., Machado L.N., De Rosa G., Collazuol G., Iacob F., Lamoureux M., Ospina N., Mattiazzi M., Ludovici L., Nishimura Y., Maewaka Y., Cao S.

Physical Review D ( 3 ) 2024年8月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

Second gadolinium loading to Super-Kamiokande 査読有り国際共著国際誌 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 1065 巻 2024年8月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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 Gd2(SO4)3⋅8H2O was additionally loaded into Super-Kamiokande (SK) from May 31 to July 4, 2022. As the amount of loaded Gd2(SO4)3⋅8H2O 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 Gd2(SO4)3⋅8H2O. 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

Performance of SK-Gd's Upgraded Real-time Supernova Monitoring System 査読有り国際共著国際誌 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 970 巻 ( 1 ) 2024年7月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

Search for Periodic Time Variations of the Solar <SUP>8</SUP>B Neutrino Flux between 1996 and 2018 in Super-Kamiokande 査読有り国際共著国際誌 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 132 巻 ( 24 ) 頁： 241803 2024年6月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

Solar neutrino measurements using the full data period of Super-Kamiokande-IV 査読有り国際共著国際誌 Open Access

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 109 巻 ( 9 ) 2024年5月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

Atmospheric neutrino oscillation analysis with neutron tagging and an expanded fiducial volume in Super-Kamiokande I-V 査読有り国際共著国際誌 Open Access

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 109 巻 ( 7 ) 2024年4月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

Measurement of the neutrino-oxygen neutral-current quasielastic cross section using atmospheric neutrinos in the SK-Gd experiment 査読有り国際共著国際誌 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, 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 109 巻 ( 1 ) 2024年1月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

Measurement of the forward η meson production rate in p-p collisions at √s = 13 TeV with the LHCf-Arm2 detector 査読有り国際共著国際誌 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 W.C., Yoshida K.

Journal of High Energy Physics 2023 巻 ( 10 ) 2023年10月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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 pT < 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

Search for Astrophysical Electron Antineutrinos in Super-Kamiokande with 0.01% Gadolinium-loaded Water 査読有り国際共著国際誌 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 951 巻 ( 2 ) 2023年7月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

Measurement of the cosmogenic neutron yield in Super-Kamiokande with gadolinium loaded water 査読有り国際共著国際誌 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 107 巻 ( 9 ) 2023年5月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

Search for Cosmic-Ray Boosted Sub-GeV Dark Matter Using Recoil Protons at Super-Kamiokande 査読有り国際共著国際誌 Open Access

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, V; Yankelevich, A; Hill, J; 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, LHV; Martin, D; Scott, M; Sztuc, AA; Uchida, Y; Berardi, V; 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; 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; 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; 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, I; Ichikawa, AK; Nakamura, KD; Tairafune, S; Nishijima, K; Iwamoto, K; Nakagiri, K; Nakajima, Y; Taniuchi, N; Yokoyama, M; Martens, K; de Perio, P; Vagins, MR; Kuze, M; Izumiyama, S; Inomoto, M; Ishitsuka, M; Ito, H; Kinoshita, T; Matsumoto, R; Ommura, Y; Shigeta, N; Shinoki, M; Suganuma, T; Yamauchi, K; Martin, JF; Tanaka, HA; Towstego, T; Akutsu, R; Gousy-Leblanc, V; 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; Marti, L; Minamino, A; Pintaudi, G; Sano, S; Suzuki, S; Wada, K

PHYSICAL REVIEW LETTERS 130 巻 ( 3 ) 頁： 031802 2023年1月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Physical Review Letters

We report a search for cosmic-ray boosted dark matter with protons using the 0.37 megaton×years data collected at Super-Kamiokande experiment during the 1996-2018 period (SKI-IV phase). We searched for an excess of proton recoils above the atmospheric neutrino background from the vicinity of the Galactic Center. No such excess is observed, and limits are calculated for two reference models of dark matter with either a constant interaction cross section or through a scalar mediator. This is the first experimental search for boosted dark matter with hadrons using directional information. The results present the most stringent limits on cosmic-ray boosted dark matter and exclude the dark matter-nucleon elastic scattering cross section between 10-33cm2 and 10-27cm2 for dark matter mass from 1 MeV/c2 to 300 MeV/c2.

DOI： 10.1103/PhysRevLett.130.031802

その他リンク： https://arxiv.org/abs/2209.14968

LHCf Run II physics results in proton-proton collisions at √s = 13 TeV 招待有り国際共著

A. Tiberio et al.

Proceedings of Science 414 巻頁： 121 2022年11月

Search for proton decay via p → μ<SUP>+</SUP> K<SUP>0</SUP> in 0.37 megaton-years exposure of Super-Kamiokande 査読有り国際共著国際誌 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 106 巻 ( 7 ) 2022年10月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

Searching for Supernova Bursts in Super-Kamiokande IV 査読有り国際共著国際誌 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 938 巻 ( 1 ) 2022年10月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

Neutron tagging following atmospheric neutrino events in a water Cherenkov detector 査読有り国際共著国際誌 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 17 巻 ( 10 ) 2022年10月

Pre-supernova Alert System for Super-Kamiokande 査読有り国際共著国際誌 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, V; 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, V; 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, LHV; Martin, D; Scott, M; Sztuc, AA; Uchida, Y; Berardi, V; 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, I; 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 935 巻 ( 1 ) 2022年8月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

Search for solar electron anti-neutrinos due to spin-flavor precession in the Sun with Super-Kamiokande-IV 査読有り国際共著国際誌 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 139 巻 2022年6月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Astroparticle Physics

Due to a very low production rate of electron anti-neutrinos (ν̄e) via nuclear fusion in the Sun, a flux of solar ν̄e is unexpected. An appearance of ν̄e 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 (νe→ν̄e) when neutrino has a finite magnetic moment. In this work, we have searched for solar ν̄e in the Super-Kamiokande experiment, using neutron tagging to identify their inverse beta decay signature. We identified 78 ν̄e 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 νe→ν̄e 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

COSMOS X as a general purpose air shower simulation tool 国際誌 Open Access

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

Proceedings of Science 395 巻 2022年3月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：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

Very-forward π<sup>0</sup> production cross section in proton-proton collisions at <sup>√</sup>s = 13 TeV measured with the LHCf experiment 国際共著国際誌 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 395 巻 2022年3月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：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

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

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

Proceedings of Science 395 巻 2022年3月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：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

Follow-up of GWTC-2 gravitational wave events with neutrinos from the Super-Kamiokande detector 国際共著国際誌 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 395 巻 2022年3月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：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

Diffuse Supernova Neutrino Background search at Super-Kamiokande with neutron tagging 国際共著国際誌 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 395 巻 2022年3月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：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

Construction status and prospects of the Hyper-Kamiokande project 国際共著国際誌 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 395 巻 2022年3月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：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

Low energy radioactivity BG model in Super-Kamiokande detector from SK-IV data 国際共著国際誌 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 395 巻 2022年3月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：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

Prospects for neutrino astrophysics with Hyper-Kamiokande 国際共著国際誌 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 395 巻 2022年3月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：Proceedings of Science

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

Measurements of the charge ratio and polarization of cosmic-ray muons with the Super-Kamiokande detector 国際共著国際誌 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 395 巻 2022年3月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：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

First gadolinium loading to Super-Kamiokande 招待有り査読有り国際共著国際誌 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 1027 巻 2022年3月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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 Gd2(SO4)3⋅8H2O (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 Gd2(SO4)3⋅8H2O 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

Diffuse supernova neutrino background search at Super-Kamiokande 査読有り国際共著国際誌 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 104 巻 ( 12 ) 2021年12月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

Search for tens of MeV neutrinos associated with gamma-ray bursts in Super-Kamiokande 査読有り国際共著国際誌 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 2021 巻 ( 10 ) 2021年10月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

Search for Neutrinos in Coincidence with Gravitational Wave Events from the LIGO-Virgo O3a Observing Run with the Super-Kamiokande Detector 査読有り国際共著国際誌 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 918 巻 ( 2 ) 2021年9月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

The energy spectrum of forward photons measured by the RHICf experiment in <sup>√</sup>s = 510 GeV proton-proton collisions 国際共著国際誌

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 358 巻 2021年7月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：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.

The energy spectrum of forward photons measured by the RHICf experiment in <sup>√</sup>s = 510 GeV proton-proton collisions 国際共著国際誌 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 358 巻 2021年7月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：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

Supernova Model Discrimination with Hyper-Kamiokande 査読有り国際共著国際誌 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 916 巻 ( 1 ) 2021年7月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

Neutron-antineutron oscillation search using a 0.37 megaton-years exposure of Super-Kamiokande 査読有り国際共著国際誌 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, V; 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, LHV; 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; 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, I; 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 103 巻 ( 1 ) 2021年1月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Physical Review D

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

LHCf plan for proton-oxygen collisions at LHC

O. Adriani et al. (LHCf Collaboration)

Proceedings of Science 395 巻頁： 348 2021年

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

Ken Ohashi, Hiroaki Menjo, Yoshitaka Itow, Takashi Sako

Proceedings of Science 395 巻頁： 190 2021年

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

Kazufumi Sato, Hiroaki Menjo, Yoshitaka Itow, Morihiro Honda

Proceedings of Science 395 巻頁： 1210 2021年

Very-forward pi0 production cross section in proton-proton collisions at √s = 13 TeV measured with the LHCf experiment 国際共著

Proceedings of Science 395 巻頁： 386 2021年

Status and Prospects of the LHCf and RHICf experiments

H. Menjo, et al.

Proceedings of Science 395 巻頁： 301 2021年

Results from the LHCf Run II in proton-proton collisions at vs = 13 TeV 国際共著国際誌 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 398 巻 2021年

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：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

Search for proton decay via <i>p</i> → <i>e</i><SUP>+</SUP>π<SUP>0</SUP> and <i>p</i> → μ<SUP>+</SUP>π<SUP>0</SUP> with an enlarged fiducial volume in Super-Kamiokande I-IV 査読有り国際共著国際誌 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, V; 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, LHV; Litchfield, RP; 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; 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, I; 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 102 巻 ( 11 ) 2020年12月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：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

Indirect search for dark matter from the Galactic Center and halo with the Super-Kamiokande detector 査読有り国際共著国際誌 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 102 巻 ( 7 ) 2020年10月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Physical Review D

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

Update of the atmospheric neutrino flux simulation ATMNC for next-generation neutrino experiment 国際共著国際誌

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

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

LHCf program for run III 国際共著国際誌 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 382 巻 2020年

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：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

Recent results from the LHCf and RHICf experiments 国際共著国際誌 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) 208 巻 2019年

Transverse single spin asymmetry for very forward π<SUP>0</SUP> production in polarized proton-proton collisions at √<i>s</i>=510 GeV 国際共著国際誌 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) 208 巻 2019年

Latest results of the LHCf experiment 国際共著国際誌 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 364 巻 2019年

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：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

The LHCf experiment: Recent physics results 国際共著国際誌 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 340 巻 2019年

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：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

The energy spectrum of forward photons measured by the RHICf experiment in <sup>v</sup>s = 510 GeV proton-proton collisions 国際共著国際誌 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 358 巻 2019年

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：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 vs = 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

MC study for the effect of diffractive events on air shower developments 国際誌 Open Access

Ohashi K., Menjo H., Itow Y.

Proceedings of Science 356 巻 2019年

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：Proceedings of Science

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, Xmax, with experimental data, how-ever, the Xmax 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 Xmax prediction.

DOI： 10.22323/1.356.0026

Measurement of inclusive forward neutron production cross section in proton-proton collisions at √<i>s</i>=13 TeV with the LHCf Arm2 detector 査読有り 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, WC; Ueno, M; Zhou, QD

JOURNAL OF HIGH ENERGY PHYSICS 2018 巻 ( 11 ) 2018年11月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of High Energy Physics

In this paper, we report the measurement relative to the production of forward neutrons in proton-proton collisions at s=13 TeV obtained using the LHCf Arm2 detector at the Large Hadron Collider. The results for the inclusive differential production cross section are presented as a function of energy in three different pseudorapidity regions: η > 10.76, 8.99 < η < 9.22 and 8.81 < η < 8.99. The analysis was performed using a data set acquired in June 2015 that corresponds to an integrated luminosity of 0.194 nb−1. The measurements were compared with the predictions of several hadronic interaction models used to simulate air showers generated by Ultra High Energy Cosmic Rays. None of these generators showed good agreement with the data for all pseudorapidity intervals. For η > 10.76, no model is able to reproduce the observed peak structure at around 5 TeV and all models underestimate the total production cross section: among them, QGSJET II-04 shows the smallest deficit with respect to data for the whole energy range. For 8.99 < η < 9.22 and 8.81 < η < 8.99, the models having the best overall agreement with data are SIBYLL 2.3 and EPOS-LHC, respectively: in particular, in both regions SIBYLL 2.3 is able to reproduce the observed peak structure at around 1.5–2.5 TeV.[Figure not available: see fulltext.].

DOI： 10.1007/JHEP11(2018)073

RHIC forward experiment to study √ s dependence of forward particle production 国際共著国際誌 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 Q.D.

EPJ Web of Conferences 145 巻 2017年6月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：EPJ Web of Conferences

The Relativistic Heavy Ion Collider forward experiment is ready to take data in the RHIC Run2017 √ s = 510 GeV p-p collisions using the LHCf Arm1 detector. New accelerator data are valuable to verify the Feynman scaling of FX1 production and to study the evolution of the break of scaling in neutron production. Using the transversely polarized proton beam, asymmetric production of forward neutrons is precisely measured. That is useful to understand the fundamental meson exchange in the proton-proton collisions.

DOI： 10.1051/epjconf/201614510005

Performance study for the photon measurements of the upgraded LHCf calorimeters with Gd<sub>2</sub>SiO<sub>5</sub> (GSO) scintillators 査読有り国際共著国際誌

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, WC; Ueno, M; Zhou, QD

JOURNAL OF INSTRUMENTATION 12 巻 ( 3 ) 2017年3月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of Instrumentation

The Large Hadron Collider forward (LHCf) experiment was motivated to understand the hadronic interaction processes relevant to cosmic-ray air shower development. We have developed radiation-hard detectors with the use of Gd2SiO5 (GSO) scintillators for proton-proton √s = 13 TeV collisions. Calibration of such detectors for photon measurement has been completed at the CERN SPS T2-H4 line in 2015 using electron beams of 100-250 GeV and muon beams of 150-250 GeV . After the channel-by-channel absolute energy calibration, the energy resolution of the calorimeters is confirmed to be better than 3% for electrons with energy above 100 GeV . The position dependence of the energy scale of the calorimeters was reduced to the level of 1% after the corrections for scintillator nonuniformity and the shower leakage effect. The position resolution of the new shower imaging detector, a GSO-bar hodoscope interleaved in the calorimeter, was 100 μm for 200 GeV electrons. The experimental results are well explained by Monte Carlo simulations. We have confirmed that the new detectors meet the requirement of the LHCf experiment at √s = 13 TeV.

DOI： 10.1088/1748-0221/12/03/P03023

The LHCf experiment: Forward particles production spectra at LHC 査読有り国際共著国際誌

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 della Societa Italiana di Fisica C 40 巻 ( 1 ) 2017年1月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：Nuovo Cimento della Societa Italiana di Fisica C

The LHC forward (LHCf) experiment consists of two small sampling calorimeters installed in the LHC tunnel at ±140 from IP1, so that it can detect neutral particles produced by p-ion collisions in the very forward region (pseudorapidity n > 8.4). The main aim of LHCf is to provide precise measurements of the particles produced in high-energy p-p and p-Pb collisions in order to tune hadronic interaction models used by ground-based cosmic rays experiments. In this paper we will discuss the present status of the LHCf experiment, the collected data and measurements done, as well as future prospects.

DOI： 10.1393/ncc/i2017-17013-x

Results of the LHCf experiment and the forward measurements at the LHC 国際共著国際誌 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 145 巻 2017年

RHIC forward experiment to study √<i>s</i> dependence of forward particle production 国際共著国際誌 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 145 巻 2017年

Measurement of very forward particle production at RHIC with √s=510GeV proton-proton collisions 国際共著国際誌 Open Access

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

Proceedings of Science 2017年

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：Proceedings of Science

The Relativistic Heavy Ion Collider forward (RHICf) experiment has measured neutral particles produced in the very forward direction in the √s=510 GeV proton-proton collisions at RHIC in June 2017. The production cross sections of these particles are crucial to understand the hadronic interaction relevant to the air shower development at the cosmic-ray equivalent energy of 1.4×1014 eV, just below the energy of the knee. Together with the data at LHC, accelerator data can cover the interaction in the cosmic-ray energy of 1014 eV to 1017 eV. In addition, RHICf is able to improve the former measurements of single-spin asymmetry in the polarized protonproton collisions that is sensitive to the fundamental process of the meson exchange. Common data taking with the STAR experiment will shed light on the unexplored low mass diffraction process.

DOI： 10.22323/1.301.0337

Monte Carlo study of diffraction in proton-proton collisions at √s = 13 TeV with the very forward detector 国際誌 Open Access

Zhou Q.D., Itow Y., Sako T., Menjo H.

Proceedings of Science 2017-January 巻 2017年

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：Proceedings of Science

Diffractive and non-diffractive collisions are totally different hadronic interaction processes, the diffractive processes are hardly predicted theoretically. This leads to the significant differences in the treatments of diffraction in the hadronic interaction models. Very forward detectors at colliders have unique sensitivity to diffractive processes, and they can be a powerful tool for studying diffractive dissociation by combining them with central detectors. Central information enables classification of the forward productions into diffraction and nondiffraction categories; in particular, most of the surviving events from the selection of diffraction belong to low-mass diffraction events which have not been measured precisely.

DOI： 10.22323/1.294.0066

LHCf Detector performance during the 2009-2010 LHC run 査読有り

O. Adriani, et al.

International Journal of Modern Physics A 28 巻 ( 25 ) 頁： 1330036 2013年10月

フィレンツェ，ポスドク体験記

毛受弘彰

日本物理学会誌 68 巻 ( 9 ) 頁： 628 2013年9月

Measurement of forward neutral pion transverse momentum spectra for √s = 7TeV proton-proton collisions at LHC 査読有り

O. Adriani. et al.

Physical Review D 86 巻 ( 9 ) 頁： 092001 2012年11月

LHCf実験の最新成果査読有り

﨏隆志, 毛受弘彰

高エネルギーニュース 31 巻 ( 2 ) 頁： 99-106 2012年7月

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 査読有り

H. Menjo, et al.

Astroparticle Physics 612 巻 ( 3 ) 頁： 513-520 2011年2月

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

O. Adriani, et al.

Physics Letters B 703 巻頁： 128-134 2011年

The LHCf detector at the CERN Large Hadron Collider 査読有り

O. Adriani, et al.

Journal of Instrumentation 08 巻 ( 08 ) 頁： S08006 2008年

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