研究者詳細 - 毛受　弘彰

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2025/04/01 更新

写真a

メンジョウ　ヒロアキ

毛受　弘彰

MENJO Hiroaki

所属

宇宙地球環境研究所基盤研究部門宇宙線研究部助教

大学院担当

大学院理学研究科

外部リンク

学位 1

博士（理学）（ 2009年6月名古屋大学）

学位の先頭へ▲

研究キーワード 3

ニュートリノ
ハドロン相互作用
高エネルギー宇宙線

研究キーワードの先頭へ▲

現在の研究課題とSDGs 3

高エネルギー宇宙線のためのLHC加速器を用いたハドロン相互作用の研究
大気ニュートリノフラックスの高精度計算
スーパーカミオカンデを用いたニュートリノの研究

現在の研究課題とSDGsの先頭へ▲

経歴 4

名古屋大学宇宙地球環境研究所基盤研究部門宇宙線研究部助教

2018年6月 - 現在
名古屋大学リーディング大学院フロンティア宇宙プログラム・特任助教

2013年3月 - 2018年5月

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国名：日本国
名古屋大学素粒子宇宙起源研究機構・特任助教

2011年1月 - 2013年3月

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国名：日本国
イタリア国立原子核物理研究所フィレンツェセクション・ポストク研究員

2009年7月 - 2010年12月

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国名：イタリア共和国

経歴の先頭へ▲

学歴 2

名古屋大学理学研究科素粒子宇宙物理学専攻

2005年4月 - 2009年6月

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国名：日本国
名古屋大学理学部物理学科

1999年4月 - 2003年3月

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国名：日本国

学歴の先頭へ▲

所属学協会 1

日本物理学会

所属学協会の先頭へ▲

論文 91

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

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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

Web of Science

Scopus
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

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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

Open Access

Web of Science

Scopus
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

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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

Open Access

Web of Science

Scopus
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

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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

Open Access

Web of Science

Scopus
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

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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

Open Access

Web of Science

Scopus

PubMed
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

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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

Open Access

Web of Science

Scopus
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

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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

Open Access

Web of Science

Scopus

arXiv
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

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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

Web of Science

Scopus
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; O'Sullivan, L; Odagawa, T; Okazaki, R; Okinaga, W; Okumura, K; Okusawa, T; Onda, N; Ospina, N; Osu, L; Palladino, V; Paolone, V; Pari, M; Parlone, J; Pasternak, J; Payne, D; Penn, GC; Pershey, D; Pfaff, M; Pickering, L; Pintaudi, G; Pistillo, C; Popov, B; Porwit, K; Posiadala-Zezula, M; Prabhu, YS; Prasad, H; Pupilli, F; Quilain, B; Quyen, PT; Radermacher, T; Radicioni, E; Radics, B; Ramirez, MA; Ratoff, PN; Reh, M; Riccio, C; Rondio, E; Roth, S; Roy, N; Rubbia, A; Russo, L; Rychter, A; Saenz, W; Sánchez, F; Sato, Y; Schefke, T; Schloesser, CM; Scholberg, K; Scott, M; Seiya, Y; Sekiya, H; Sgalaberna, D; Shaikhiev, A; Shiozawa, M; Shiraishi, Y; Shvartsman, A; Skrobova, N; Skwarczynski, K; Smyczek, D; Smy, M; Sobczyk, JT; Sobel, H; Soler, FJP; Speers, AJ; Spina, R; Stroke, Y; Suslov, IA; Suvorov, S; Suzuki, A; Suzuki, SY; Suzuki, Y; Tada, M; Tairafune, S; Takeda, A; Takeuchi, Y; Takifuji, K; Tanaka, HK; Tanigawa, H; Teklu, A; Tereshchenko, VV; Thamm, N; Thompson, LF; Toki, W; Touramanis, C; Tsukamoto, T; Tzanov, M; Uchida, Y; Vagins, M; Vargas, D; Varghese, M; Vasseur, G; Villa, E; Vinning, WGS; Virginet, U; Vladisavljevic, T; Wachala, T; Wakabayashi, D; Wallace, HT; Walsh, JG; Wang, Y; Wan, L; Wark, D; Wascko, MO; Weber, A; Wendell, R; Wilking, MJ; Wilkinson, C; Wilson, JR; Wood, K; Wret, C; Xia, J; Xu, YH; Yamamoto, K; Yamamoto, T; Yanagisawa, C; Yang, G; Yano, T; Yasutome, K; Yershov, N; Yevarouskaya, U; Yoshimoto, Y; Yoshimura, N; Yu, M; Zaki, R; Zalewska, A; Zalipska, J; Zaremba, K; Zarnecki, G; Zhang, J; Zhao, XY; Zhong, H; Zhu, T; Ziembicki, M; Zimmerman, ED; Zito, M

PHYSICAL REVIEW LETTERS 134 巻 ( 1 ) 頁： 011801 2025年1月

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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

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PubMed
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

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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

Open Access

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Scopus
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

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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

Open Access

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Scopus
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

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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

Open Access

Web of Science

Scopus
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

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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

Open Access

Scopus
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

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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

Open Access

Scopus
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

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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

Open Access

Scopus
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

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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

Open Access

Scopus
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

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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

Open Access

Scopus
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

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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

Open Access

Scopus
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

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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

Open Access

Scopus
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

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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

Open Access

Scopus
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

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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

Open Access

Scopus
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

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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

Open Access

Scopus
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

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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

Open Access

Scopus
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

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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

Open Access

Scopus
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

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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

Open Access

Scopus
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

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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

Open Access

Scopus
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

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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

Scopus
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

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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

Open Access

Web of Science

Scopus
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

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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

Open Access

Web of Science

Scopus
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

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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

Open Access

Web of Science

Scopus

PubMed
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

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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

Open Access

Web of Science

Scopus
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

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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

Open Access

Web of Science

Scopus
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

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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

Open Access

Web of Science

Scopus
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

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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

Open Access

Web of Science

Scopus
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

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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

Open Access

Web of Science

Scopus
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

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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

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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

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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

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Web of Science

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PubMed

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

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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）

DOI： 10.22323/1.414.0121
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

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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

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Web of Science

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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

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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

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Web of Science

Scopus
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

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1088/1748-0221/17/10/P10029

Open Access

Web of Science
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

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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

Open Access

Web of Science

Scopus
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

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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

Open Access

Scopus
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

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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

Open Access

Scopus
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

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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

Open Access

Scopus
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

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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

Open Access

Scopus
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

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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

Open Access

Scopus
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

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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

Open Access

Scopus
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

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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

Open Access

Scopus
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

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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

Open Access

Scopus
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

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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

Open Access

Scopus
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

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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

Open Access

Scopus
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

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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

Web of Science

Scopus
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

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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

Web of Science

Scopus
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

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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

Open Access

Web of Science

Scopus
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

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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

Open Access

Web of Science

Scopus
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

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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.

Scopus
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

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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

Open Access

Scopus
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

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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

Web of Science

Scopus
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

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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

Open Access

Web of Science

Scopus
LHCf plan for proton-oxygen collisions at LHC

O. Adriani et al. (LHCf Collaboration)

Proceedings of Science 395 巻頁： 348 2021年

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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）

DOI： 10.22323/1.395.0348
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

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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）

DOI： 10.22323/1.395.0190
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

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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）

DOI： 10.22323/1.395.1210
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

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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）

DOI： 10.22323/1.395.0386
Status and Prospects of the LHCf and RHICf experiments

H. Menjo, et al.

Proceedings of Science 395 巻頁： 301 2021年

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担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

DOI： 10.22323/1.395.0301
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

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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

Open Access

Scopus
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

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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

Open Access

Web of Science

Scopus
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

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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

Open Access

Web of Science

Scopus
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

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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）

DOI： 10.1088/1742-6596/1468/1/012194

Web of Science
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

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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

Open Access

Scopus
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

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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）

DOI： 10.1051/epjconf/201920805004

Open Access

Web of Science
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

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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）

DOI： 10.1051/epjconf/201920805007

Open Access

Web of Science
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

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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

Open Access

Scopus
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

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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

Open Access

Scopus
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

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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

Open Access

Scopus
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

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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

Open Access

Scopus
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

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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

Open Access

Web of Science

Scopus
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

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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

Open Access

Scopus
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

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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

Web of Science

Scopus
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

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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

Web of Science

Scopus
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

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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）

DOI： 10.1051/epjconf/201714509002

Open Access

Web of Science
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

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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）

DOI： 10.1051/epjconf/201714510005

Open Access

Web of Science
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

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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

Open Access

Scopus
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

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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

Open Access

Scopus
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

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記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.1142/S0217751X13300366
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

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担当区分：筆頭著者記述言語：日本語掲載種別：研究論文（大学，研究機関等紀要）

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

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記述言語：英語掲載種別：研究論文（学術雑誌）

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

DOI： 10.1103/PhysRevD.86.092001
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

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担当区分：筆頭著者記述言語：日本語掲載種別：研究論文（学術雑誌）

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

H. Menjo, et al.

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

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記述言語：英語掲載種別：研究論文（学術雑誌）
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

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記述言語：英語掲載種別：研究論文（学術雑誌）
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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記述言語：英語掲載種別：研究論文（学術雑誌）

▼全件表示

論文の先頭へ▲

MISC 9

Measurements of longitudinal and transverse momentum distributions for neutral pions in the forward-rapidity region with the LHCf detector 査読有り

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

PHYSICAL REVIEW D94 巻 ( 3 ) 2016年8月

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記述言語：英語

DOI： 10.1103/PhysRevD.94.032007

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

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

PHYSICS LETTERS B750 巻頁： 360-366 2015年11月

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記述言語：英語

DOI： 10.1016/j.physletb.2015.09.041

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

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

PHYSICAL REVIEW C89 巻 ( 6 ) 2014年6月

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記述言語：英語

DOI： 10.1103/PhysRevC.89.065209

Web of Science
The performance of the LHCf detector for hadronic showers 査読有り

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

JOURNAL OF INSTRUMENTATION9 巻 2014年3月

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記述言語：英語

DOI： 10.1088/1748-0221/9/03/P03016

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

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

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT692 巻頁： 224-227 2012年11月

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担当区分：筆頭著者記述言語：英語

DOI： 10.1016/j.nima.2011.12.071

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

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

PHYSICS LETTERS B715 巻 ( 4-5 ) 頁： 298-303 2012年9月

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記述言語：英語

DOI： 10.1016/j.physletb.2012.07.065

Web of Science
Performance of the prototype detector for the LHCf experiment 査読有り

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

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT578 巻 ( 1 ) 頁： 146-159 2007年7月

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記述言語：英語

DOI： 10.1016/j.nima.2007.05.267

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

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

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS259 巻 ( 1 ) 頁： 408-413 2007年6月

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記述言語：英語

DOI： 10.1016/j.nimb.2007.02.005

Web of Science
Cyclicity of solar activity during the Maunder minimum deduced from radiocarbon content 査読有り

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

SOLAR PHYSICS224 巻 ( 1 ) 頁： 317-322 2004年10月

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記述言語：英語

DOI： 10.1007/s11207-005-6501-5

Web of Science

▼全件表示

MISCの先頭へ▲

講演・口頭発表等 40

LHCを用いた宇宙線相互作用の研究

毛受弘彰

日本物理学会第79回年次大会 2024年9月18日

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開催年月日： 2024年9月

記述言語：日本語会議種別：シンポジウム・ワークショップパネル（指名）

開催地：北海道大学国名：日本国
Status and Prospects of the LHCf experiment 招待有り国際共著国際会議

Hiroaki Menjo for the LHCf Collaboration

22nd International Symposium on Very High Energy Cosmic Ray Interactions (ISVHECRI 2024) 2024年7月9日

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開催年月日： 2024年7月

記述言語：英語会議種別：口頭発表（招待・特別）

開催地：Puerto Vallarta 国名：メキシコ合衆国
Very forward hadron measurements with LHCf/RHICf detectors 招待有り国際共著国際会議

Hiroaki Menjo for LHCf/RHICf Collaborations

3rd Forward Physics Facility Meeting 2021年10月26日

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開催年月日： 2021年10月

記述言語：英語会議種別：口頭発表（招待・特別）

開催地：Online 国名：スイス連邦
Status and Prospects of the LHCf and RHICf experiments 国際共著国際会議

Hiroaki Menjo for LHCf/RHICf Collaborations

37th ICRC (International Cosmic Ray Conference) 2021年7月18日

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開催年月日： 2021年7月

記述言語：英語会議種別：口頭発表（一般）

開催地：Online 国名：ドイツ連邦共和国
LHCf実験における陽子-酸素原子核衝突測定に向けた準備状況国際共著

毛受弘彰　他LHCfコラボレーション

日本物理学会2025年度春季大会 2025年3月19日

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開催年月日： 2025年3月

記述言語：日本語会議種別：口頭発表（一般）

開催地：オンライン国名：日本国
Status and prospects of the LHCf experiment 招待有り国際共著国際会議

Hiroaki Menjo for the LHCf collaboration

The Hadronic Interaction Workshop 2025年3月19日

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開催年月日： 2025年3月

記述言語：英語会議種別：口頭発表（招待・特別）

開催地：Hong-Kong 国名：中華人民共和国
LHCf実験によるLHC最前方中性粒子測定招待有り

毛受弘彰、他LHCfコラボレーション

Go Forward workshop 2025年2月27日

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開催年月日： 2025年2月 - 2025年3月

記述言語：日本語会議種別：口頭発表（招待・特別）

開催地：長崎国名：日本国
Status and Prospects for LHCf 招待有り国際共著国際会議

Hiroaki Menjo for the LHCf Collaboration

Workshop of the EMMI Rapid Reaction Task Force on "Next Generation Facility for Forward Physics at the LHC" 2025年2月21日

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開催年月日： 2025年2月

記述言語：英語会議種別：口頭発表（招待・特別）

開催地：Heidelberg University 国名：ドイツ連邦共和国
Recent results and Prospects of the LHCf experiment 招待有り国際共著国際会議

Hiroaki Menjo for the LHCf Collaboration

New Trends of High-Energy and Low-x Physics 2024年9月2日

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開催年月日： 2024年9月

記述言語：英語会議種別：口頭発表（招待・特別）

開催地：Sfantu Gheorghe 国名：ルーマニア
Measuerment of pi0, eta and K0s measons with TeV energies by using LHCf detectors 国際共著国際会議

Hiroaki Menjo for the LHCf Collaboration

20th International Conference on Calorimetry in Particle Physics (CALOR 2024) 2024年5月21日

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開催年月日： 2024年5月

記述言語：英語会議種別：ポスター発表

開催地：Tsukuba 国名：日本国
LHCf 陽子ー酸素原子核衝突測定に向けた準備状況国際共著

毛受弘彰他LHCf Collaboration

日本物理学会 2024年春季大会 2024年3月18日

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開催年月日： 2024年3月

記述言語：日本語会議種別：口頭発表（一般）

開催地：オンライン国名：日本国
LHCf実験による LHCのビーム軸上でのハドロン測定招待有り国際共著

毛受弘彰他LHCf Collaboration

第21回高エネルギーQCD・格子構造勉強会 2023年11月1日

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開催年月日： 2023年11月

記述言語：日本語会議種別：口頭発表（招待・特別）

開催地：理化学研究所和光キャンパス国名：日本国
LHCf実験の最新結果と今後の展望国際共著

毛受弘彰他LHCf Collaboration

日本物理学会第78回年次大会 2023年9月

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開催年月日： 2023年9月

記述言語：日本語会議種別：口頭発表（一般）

開催地：東北大学国名：日本国
Performances of hadronic shower measurement at a joint operation of LHCf and ATLAS ZDC detectors 国際共著国際会議

H. Menjo for the LHCf collaboration and ATLAS ZDC group

38th International Cosmic Ray Conference (ICRC 2023) 2023年7月

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開催年月日： 2023年7月 - 2023年8月

記述言語：英語会議種別：ポスター発表

開催地：Nagoya, Japan 国名：日本国
Validation of Feynman scaling law using very forward photons measured with the RHICf detector 国際共著国際会議

H. Menjo for the RHICf collaboration

38th International Cosmic Ray Conference (ICRC 2023) 2023年7月

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開催年月日： 2023年7月 - 2023年8月

記述言語：英語会議種別：ポスター発表

開催地：Nagoya, Japan 国名：日本国
Measurement of very forward photon production cross-section at pp √s = 510 GeV with RHICf detector 国際共著国際会議

H. Menjo for the RHICf collaboration

ICHEP 2022 2023年7月

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開催年月日： 2023年7月

記述言語：英語会議種別：ポスター発表

開催地：Bologna, Italy (Hybrid) 国名：イタリア共和国
最高エネルギー観測に期待すること招待有り

毛受弘彰

研究会:次世代の最高エネルギー宇宙線観測の実現へ向けて 2023年5月20日

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開催年月日： 2023年5月

記述言語：日本語会議種別：口頭発表（招待・特別）

開催地：大阪電気電通大学国名：日本国
LHCf: Very forward measurement at LHC 招待有り国際共著国際会議

H. Menjo for LHCf collaboration

2nd International Workshop on Forward Physics and Forward Calorimeter Upgrade in ALICE 2023年3月15日

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開催年月日： 2023年3月

記述言語：英語会議種別：口頭発表（招待・特別）

開催地：Tsukuba, Japan 国名：日本国
Recent results and Prospects of LHCf and RHICf 招待有り国際共著国際会議

H. Menjo for LHCf and RHICf collaborations

The 5th KMI International Symposium (KMI2023 2023年2月21日

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開催年月日： 2023年2月

記述言語：英語会議種別：口頭発表（招待・特別）

開催地：Nagoya, Japan 国名：日本国
Very forward particle measurements with LHCf and RHICf 招待有り国際共著国際会議

H. Menjo for the LHCf and RHICf collaborations

21st International Symposium on Very High Energy Cosmic Ray Interactions (ISVHECRI 2022) 2022年5月

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開催年月日： 2022年5月

記述言語：英語会議種別：口頭発表（招待・特別）

開催地：Online
Multi-messenger astronomy in Super-Kamiokande 招待有り国際共著国際会議

H. MENJO for SK Collaboration

Synergies at new frontiers at gamma-rays, neutrinos and gravitational waves 2022年3月25日

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開催年月日： 2022年3月

記述言語：英語会議種別：口頭発表（招待・特別）

開催地：ICRR, University of Tokyo, Japan 国名：日本国
LHCf/RHICfによるトランジション領域における相互作用研究国際共著

毛受弘彰 for LHCfコラボレーション

第5回空気シャワー観測による宇宙線の起源探索勉強会 2022年3月23日

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開催年月日： 2022年3月

記述言語：日本語会議種別：口頭発表（一般）

開催地：ハイブリッド（東大宇宙線研＋オンライン）国名：日本国

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

毛受弘彰 for LHCfコラボレーション

日本物理学会第77回年次大会 2022年3月16日

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開催年月日： 2022年3月

記述言語：日本語会議種別：口頭発表（一般）

開催地：オンライン国名：日本国
スーパーカミオカンデにおける超新星爆発ニュートリノアラート招待有り国際共著

毛受弘彰 for SKコラボレーション

第12回光赤外天文学大学間連携ワークショップ 2021年11月25日

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開催年月日： 2021年11月

記述言語：日本語会議種別：口頭発表（招待・特別）

開催地：オンライン国名：日本国

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

Hiroaki Menjo for RHICf Collaboration

2021 RHIC/AGS Annual Users' Meeting 2021年6月8日

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開催年月日： 2021年6月

記述言語：英語会議種別：口頭発表（一般）

開催地：Online 国名：アメリカ合衆国
LHCf achievements at pp and pPb 招待有り国際共著国際会議

Hiroaki Menjo for LHCf Collaboration

Opportunities of OO and pO collisions at the LHC 2021年2月10日

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開催年月日： 2021年2月

記述言語：英語会議種別：口頭発表（招待・特別）

開催地：Online 国名：スイス連邦
LHCf/RHICf の物理と検出器招待有り国際共著

毛受弘彰 for LHCf/RHICfコラボレーション

KEK研究会「素粒子・原子核コライダー物理の交点」 2020年8月31日

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開催年月日： 2020年8月 - 2020年9月

記述言語：日本語会議種別：口頭発表（招待・特別）

開催地：オンライン国名：日本国

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

LHCf collaboration

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

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開催年月日： 2019年9月

記述言語：英語会議種別：口頭発表（一般）

開催地：Toyama, Japan 国名：日本国

LHC加速器を用いて行っている最前方領域測定実験LHCfの最新成果を発表した。
The results and future prospects of the LHCf experiment 招待有り国際会議

LHCf collaboration

36th International Cosmic Ray Conference (ICRC2019)

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開催年月日： 2019年7月 - 2019年8月

記述言語：英語会議種別：口頭発表（一般）

開催地：Madison, USA 国名：アメリカ合衆国

LHC加速器を用いた最前方領域測定実験LHCfの最新の成果と将来展望を報告。13TeV陽子衝突でのパイゼロ中間子測定結果を初めて報告した。
Status of the LHCf experiment 招待有り国際会議

LHCf collaboration

35th International Cosmic Ray Conference (ICRC2017)

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開催年月日： 2017年7月

記述言語：英語会議種別：口頭発表（招待・特別）

国名：大韓民国

LHC加速器を用いた最前方領域測定実験LHCfのこれまでの成果と今後の展望をレビューした。
Resent results from the LHCf experiment 招待有り国際会議

LHCf collaboration

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

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開催年月日： 2016年10月

記述言語：英語会議種別：口頭発表（招待・特別）

開催地：Kyoto, Japan 国名：日本国

LHC加速器を用いた最前方領域測定実験LHCfの最新成果と今後の測定計画について報告した。
Forward photon energy spectrum at LHC 7TeV p-p collisions measured by LHCf 国際会議

Hiroaki Menjo, for the LHCf collaboration.

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

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開催年月日： 2011年5月

記述言語：英語会議種別：口頭発表（一般）

国名：イタリア共和国
LHCf実験の最新成果国際会議

毛受弘彰、他

日本物理学会2010年秋季大会

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開催年月日： 2010年9月

記述言語：日本語会議種別：口頭発表（招待・特別）

開催地：九州工業大学国名：日本国
Comparison of hadron interaction models with measurement of forward spectra by the LHCf apparatus 国際会議

H. MENJO for the LHCf collaboration

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

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開催年月日： 2010年9月

記述言語：英語会議種別：口頭発表（一般）

国名：イタリア共和国
Energy spectra measured by a LHC forward experiment : LHCf 国際会議

H. MENJO for the LHCf collaboration

ECRS 2010 (22nd European Cosmic Ray Symposium)

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開催年月日： 2010年9月

記述言語：英語会議種別：口頭発表（一般）

国名：フィンランド共和国
The status and preliminary results of the LHC forward experiment: LHCf 国際会議

H. MENJO for the LHCf collaboration

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

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開催年月日： 2010年4月

記述言語：英語会議種別：口頭発表（一般）

国名：イタリア共和国
The LHCf experiment 国際会議

H. MENJO for the LHCf collaboration

MC4LHC

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開催年月日： 2010年3月 - 2010年4月

記述言語：英語会議種別：口頭発表（一般）

国名：スイス連邦
Simulation Study for the performance of the LHCf experiment 国際会議

H. MENJO for the LHCf collaboration

31st ICRC (International Cosmic Ray Conference)

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開催年月日： 2009年7月

記述言語：英語会議種別：ポスター発表

国名：ポーランド共和国
Status of the LHCf Experiment 国際会議

H. MENJO for the LHCf collaboration

30th ICRC (International Cosmic Ray Conference)

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開催年月日： 2007年7月

記述言語：英語会議種別：口頭発表（一般）

国名：メキシコ合衆国
The Performance of the LHCf Detectors 国際会議

H. MENJO for the LHCf collaboration

30th ICRC (International Cosmic Ray Conference)

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開催年月日： 2007年7月

記述言語：英語会議種別：ポスター発表

国名：メキシコ合衆国

▼全件表示

講演・口頭発表等の先頭へ▲

共同研究・競争的資金等の研究課題 2

Knee領域および最高エネルギー領域での宇宙線反応の実験的研究

2021年4月 - 2022年3月

東京大学宇宙線研究所共同利用研究

毛受弘彰、伊藤好孝、村木綏、大橋健、笠原克昌、櫻井信之、﨏隆志、佐川宏行、近藤萌

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担当区分：研究代表者資金種別：競争的資金

配分額：143000円（直接経費：143000円）
トランジェント天体に同期したニュートリノ事象の探索国際共著

2021年4月 - 2022年3月

東京大学宇宙線研究所共同利用研究

毛受　弘彰、伊藤　好孝、小汐　由介、奥村　公宏、南野　彰宏、原田　将之、酒井　聖矢、佐野　翔一、 COLLAZUOL GIANMARIA、 Nataly Ospina Escobar、 Mathieu Lamoureux、 Linyan Wan、 Kate Scholberg

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担当区分：研究代表者資金種別：競争的資金

配分額：100000円（直接経費：100000円）

共同研究・競争的資金等の研究課題の先頭へ▲

科研費 10

LHC陽子ー酸素原子核衝突の超前方生成粒子の測定国際共著

研究課題/研究課題番号：24K00660 2024年4月 - 2027年3月

科学研究費助成事業基盤研究(B)

毛受弘彰

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担当区分：研究代表者資金種別：競争的資金

配分額：18460000円（直接経費：14200000円、間接経費：4260000円）

高エネルギー宇宙線が地上大気と衝突して生成する空気シャワー現象を理解するためには、ハドロン相互作用の理解が不可欠である。世界最大の粒子加速器であるLHC加速器を用いて、陽子ー酸素原子核の衝突が2025年に実現する。これは宇宙線と大気の衝突を再現する理想的な実験条件であり、本研究ではこの衝突で超前方領域に生じる高エネルギー粒子を測定する。これにより、宇宙線相互作用の理解が進み、超高エネルギー宇宙線観測で問題となっているミューオン過剰問題の解決に結びつくと期待されている。
LHC陽子－酸素原子核衝突を用いた高エネルギー宇宙線相互作用の研究国際共著

研究課題/研究課題番号：23KK0056 2023年9月 - 2027年3月

科学研究費助成事業国際共同研究加速基金(海外連携研究)

毛受弘彰, 大島仁, 田村忠久

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担当区分：研究代表者資金種別：競争的資金

配分額：20930000円（直接経費：16100000円、間接経費：4830000円）

超高エネルギー宇宙線観測のためには、高エネルギー宇宙線が地球大気内で生成する空気シャワー発達の理解が不可欠である。高エネルギー宇宙線と地球大気の衝突を再現する陽子ー酸素原子核衝突が２０２４年にLHC加速器で予定されている。このときに最前方領域に生成される粒子をLHCf検出器で測定した結果と、TA-TAIL検出器による宇宙線空気シャワー観測結果と比較することでミューオン過剰問題への寄与を明らかにする。
超高エネルギー宇宙線は銀河系外を加速して生成されていることがわかっているが、具体的な加速天体や加速メカニズムについてはわかっていない。この研究を困難にしている要因の１つが超高エネルギー宇宙線と地球大気との衝突によって生じる空気シャワー現象の理解不足である。超高エネルギー宇宙線の観測では、宇宙線が大気と衝突して生じる空気シャワー現象を用いて行われている。そのため、観測結果を正しく理解するためには空気シャワー現象の理解、特に宇宙線と地球大気によるハドロン相互作用の理解が重要となっている。本研究では、この宇宙線と大気とのハドロン相互作用の理解を、スイスのCERN研究所に設置されている世界最大の粒子加速器であるLarge Hadron Collider (LHC) を用いた測定（LHCf実験）と、アメリカ・ユタ州で行っている宇宙線観測（Telescope Array実験）とを組み合わせて行っていく。
LHC加速器ではこれまで陽子ー陽子衝突や陽子ー鉛原子核衝突での測定が行われてきたが、これらは実際の宇宙線と大気原子核との衝突とは異なっている。我々を含む宇宙線コミュニティの長年のリクエストによって、LHCで陽子ー酸素原子核の衝突が２０２５年(当初予定では２０２４年)に実現する。そこでのLHCf実験の測定を実現すべく、冬にCERN研究所にてデータ収集システムや検出器の準備作業を行った。このときにシステムの最適化によってデータ収集スピードを従来よりも２倍高速にすることに成功した。これによって測定時の取得統計量の増加が期待できる。
またTA実験では低エネルギー拡張であるTA－TAIL Infill アレイの設置が進められて、データ取得が順調に進められている。
本研究の核となる２つの実験の１つであるLHCでの陽子‐酸素原子核衝突の測定が計画立案当初予定されていた２０２４年から２０２５年に変更になってしまった。これは２０２３年１２月に、LHC運営委員会にて２０２２年度と２０２３年度のLHC加速器の運転実績を踏まえて、２０２４年と２０２５年の運転スケジュールの大幅な見直しが行われたためである。LHCの運転スケジュールはATLASなど他の実験や加速器のメンテナンスなどの都合を考慮して総合的に決定されるため、陽子‐酸素原子核衝突の時期の変更は受け入れざるおえないものである。
LHC加速器での陽子ー鉛原子核衝突の測定は残念ながら２０２５年に延期されてしまったが、2024年度は余裕ができた時間をつかってLHC測定の準備の更なる入念な準備と、TAによる宇宙線空気シャワー観測とハドロン相互作用のパラメータの関係をシミュレーションを用いて研究を行う。
2023年冬に陽子ー鉛原子核衝突測定のLHCf実験の測定の準備を順調に進めることができた。さらにLHCfとATLAS実験の共同測定の準備をATLAS実験のメンバーと共に2024年冬のLHC停止期間中に行う。本番測定は５日間程度しかないため、その短い時間を有効に測定に使うために試運転時間を最小化する必要がある。ATLASとの共同測定は過去にも成功させているが、トリガータイミングなど測定ごとに調整が必要である。これを測定前に事前に行うことによって2025年6月の測定時に共同測定を確実に成功できると共に試運転時間を最小にすることができる。
本研究ではLHCで測定した結果を組み込んだシミュレーションと実際のTAによる宇宙線観測と比較することで、宇宙線相互作用の更なる理解を進めることがポイントである。LHCf実験結果を想定した値をシミュレーションに組み込んでTA実験の応答を求めることで、LHCf実験が感度がある測定量とTA実験の観測量の関係を明らかにする。これによって、実際の測定データが出たとこの解析をスムースに行うことができると共に、より実際に即した解析を事前に行うことでLHCfとTAの観測に必要な統計量や測定精度についてのフィードバックをかけることができる。
LHC陽子衝突の最前方領域でのストレンジメソンの測定国際共著

研究課題/研究課題番号：20H01917 2020年4月 - 2023年3月

科学研究費助成事業基盤研究(B)

毛受弘彰, 伊藤好孝

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担当区分：研究代表者資金種別：競争的資金

配分額：17680000円（直接経費：13600000円、間接経費：4080000円）

高エネルギーハドロン相互作用の理解は、超高エネルギー宇宙線の観測結果の解釈に不可欠なものであり、LHC実験による測定データが待ち望まれている。我々はこれまでLHC加速器の最前方領域測定実験であるLHCf実験を進めてきており、π0測定などを成功させて相互作用研究に貢献してきた。本研究では、LHC陽子－陽子衝突でのη、K0s、Λ粒子測定をLHCf検出器で行うことによって、宇宙線観測で問題となっている地上ミューオン過剰問題を解決する可能性あるK中間子を代表とするストレンジメソンの高エネルギー衝突での生成メカニズムを解明する。
2022年9月に重心系衝突エネルギー13.６TeVの陽子陽子衝突の測定を行った。過去の測定時よりもデータ読み出し回路の改良やトリガーの改良によって効率的なデータ収集を行い、3億イベントのデータを取得した。これは2015年に行った測定よりも7倍以上の統計量である。
2015年取得のデータも用いてη中間子の微分生成断面積の測定を行った。これによって、相互作用モデルの中でもQGSJET IIIがよくデータを再現していることがわかった。η中間子とπ0中間子比が一定の値となっていることから、η中間子生成についてエネルギーによらないユニバーサルなプロセスがあることが予想される。
本研究では世界で初めて高エネルギーハドロン衝突の超前方領域でのストレンジメソンの生成断面積測定を行った。その結果、少なくともη中間子は多くの相互作用モデルの予想よりも少ない生成断面積であることがわかった。このことは、既存の相互作用モデルの改良が必要であり、これまでの空気シャワー発達シミュレーションの結果が変わることを意味する。これによって超高エネルギー宇宙線観測の観測結果、特に化学組成の測定結果の解釈に影響を与えると考えられる。これを通して、超高エネルギー宇宙線の加速源の解明に繋がっていくことが期待される。
LHC,RHICでの陽子－陽子衝突を用いた陽子－パイ中間子相互作用の研究

研究課題/研究課題番号：16K17692 2016年4月 - 2019年3月

科学研究費助成事業若手研究(B)

毛受弘彰, 周啓東, 大橋健

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担当区分：研究代表者資金種別：競争的資金

配分額：3770000円（直接経費：2900000円、間接経費：870000円）

本研究を進めるにあたり、スイスにある世界最大の粒子加速器LHCを用いてたLHCfとATLASの2つの実験の共同データ解析体制を確立した。2つの実験グループ間の相互理解を進めるためにまずはシンプルな解析である最前方光子生成における回折事象の寄与の測定を行った。回析事象は、陽子－陽子衝突の内、約２０％をしめており、衝突の中心領域での粒子生成が少ない。これを利用し、ATLAS検出器で粒子検出がない事象を選んでLHCf検出器の光子イベントを解析した。陽子－陽子衝突データを用いた陽子－パイ中間子衝突測定の解析は現在進行中であり、この結果も近いうちに公表できる予定である。
本研究は、世界最大の粒子加速器LHCを用いてハドロン相互作用を研究し、宇宙線と大気との相互作用の理解を進めることによって宇宙線研究に貢献するものである。今回得られた回折事象の測定結果は、一部のハドロン相互作用モデルの改良にすでに使用されている。陽子－パイ中間子の相互作用は、現在あるハドロン相互作用モデル間で差が大きく、測定結果によってモデルの検証が進む。
RHIC偏極陽子衝突による超前方領域での粒子生成の起源の研究・解明国際共著

研究課題/研究課題番号：21H04484 2021年4月 - 2025年3月

科学研究費助成事業基盤研究(A)

後藤雄二, 中川格, 毛受弘彰, 谷田聖, 三塚岳, 中條達也

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担当区分：研究分担者資金種別：競争的資金

我々はスピンの向きをそろえた（偏極した）陽子同士の衝突により、衝突位置の超前方に生成される中性パイ中間子が大きな左右非対称度を持つことを発見した。陽子衝突での粒子生成に対する理論・計算の構築は積年の研究課題であり、高エネルギーの宇宙線が大気中で起こす空気シャワーの理解のためにも、その発展が望まれている。本研究では新たな大きな検出器を建設して偏極陽子と陽子及び原子核との衝突実験を行い、この粒子生成の起源を解明する。大きな検出器により新たな粒子（中性K中間子、ラムダ粒子）についても生成断面積、左右非対称度、原子核の核種依存性を測定し、さらに他の検出器で測定された粒子との相関を調べる。
RHIC偏極陽子衝突による超前方領域での粒子生成の起源の研究・解明を目標とし、広い横運動量の領域について統合する衝突モデルを築き、粒子生成の起源の解明を行う。中性K中間子、ラムダ粒子など、これまで衝突モデルの入力データとして取り入れられていない粒子を含む多様な粒子の生成断面積、左右非対称度、原子核の核種依存性、他の粒子との相関を研究を行なう。
新たなシリコン検出器を用いたカロリメータ検出器を開発・建設し、新たな測定を行うことにより目標を達成する。このためのプロトタイプ検出器のテスト、評価を実験室及び東北大ELPH施設やCERN-PSおよびSPS加速器でのテストビーム、理研小型中性子照射施設での放射線耐性テストを進めた結果、シリコン検出器の技術の選択を行い、次の段階の検出器の製作を開始している。
テストの結果は学会や研究会、国際会議で発表され専門家の評価を得て、さらに共同実験グループ内でのレビューを行っている。全ての結果は技術報告書にまとめられ、研究会や会議の会議録として公表されており、論文として出版する。
また2017年のRHICでの実験データの解析も順調に行われている。既に論文として出版した中性パイ中間子の非対称度に加えて、光子の生成断面積、中性子の非対称度の解析が終了し、学会や研究会、国際会議で発表されている。光子の生成断面積はCERN-LHCのより高エネルギーでの陽子衝突の結果との比較が行われ、衝突エネルギーに依らないスケーリング則を支持する結果となっている。この結果は超高エネルギーの宇宙線の大気との衝突事象を再現するための事象生成コードの開発に必要な新しいデータとなる。中性子の非対称度としては高い統計量のデータ解析により、予定していた高い分解能で広範囲の横運動量領域を覆う結果を得た。結果は大きな非対称度を示すたいへん興味深いデータを示しており、論文として出版した。
研究計画からはシリコン材料や機器の供給不足の問題もあり遅れているが、プロトタイプ検出器のテストによる新たなカロリメータ検出器の開発・建設のためのシリコン検出器のセンサーや電子回路部品や基板の評価、技術の選択を行い次の段階の検出器のためのセンサー、電子回路部品、基板の製作を行っている。
テストの結果は学会や研究会、国際会議で発表され専門家の評価を得て、さらに共同実験グループ内でのレビューを行っている。評価はソフトウェアを含む最終的な検出器を想定したシミュレーション計算によっても行われ、全ての結果は技術報告書にまとめられ、研究会や会議の会議録として公表されており、論文として出版する。
また、研究計画として当初予定していた今年度の実験データ収集は、実験を実施する施設であるブルックヘブン国立研究所のRHIC加速器の運転状況、運転計画の変更により困難となっているが、次世代の施設であるEIC加速器での実験遂行を含めた研究を目的に含めて検討を行っている。
2017年のRHICでの実験データの解析については順調に進んでいる。光子の生成断面積、中性子の非対称度の解析が終了し、学会や研究会、国際会議で発表されている。どちらの実験データもたいへん興味深い結果を示している。中性子の非対称度の結果を論文として出版した。これらの非対称度の起源を探る理論研究も行われ、実験データとの比較を進めている。こちらも最終結果を論文として出版する準備を進めている。
研究計画として当初予定していた今年度の実験データ収集は、実験を実施する施設であるブルックヘブン国立研究所のRHIC加速器の運転状況、運転計画の変更により困難となっている。引き続き、今後の実験遂行、データ収集に向けた実験施設との交渉を進めるが、今後はRHIC加速器施設の終了後の次世代の施設であるEIC加速器における実験遂行を含めた研究計画の修正の可能性も含めた検討を行う。
今年度も筑波大グループがリードして進めているLHCのALICE実験で用いるFoCalカロリメータの技術を用いた大型の高性能カロリメータの製作を引き続き進め、完成させる。これはタングステンを吸収層、シリコンパッド検出器をエネルギー測定層として用いるサンドウィッチ型のサンプリング・カロリメータである。高精度の位置情報は、より細密なシリコンピクセル検出器により与えられる。
これまでシリコンパッド検出器のセンサーおよび読み出し・トリガー回路の開発・試作を進めてきた結果としてシリコンセンサーについてはp型センサーを用いることを決定した。同様に試作を進めてきた読み出し・トリガー回路と合わせて検出器を製作し、テストビームによる性能評価と放射線耐性の試験を行う。
実験データ解析として昨年度は中性子の左右非対称度の結果を出版したが、光子の断面積の結果も近日中に出版する。STAR検出器と合わせたデータ解析、理論計算も順調に進んでおり、実験データの解釈を進め、中性パイ中性子と中性子の非対称度を合わせて理解する。
衝突型加速器による高エネルギー宇宙線衝突での超前方粒子生成の総括的解明国際共著

研究課題/研究課題番号：18H01227 2018年4月 - 2021年3月

科学研究費助成事業基盤研究(B)

伊藤好孝, 後藤雄二, 毛受弘彰, さこ隆志

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担当区分：研究分担者資金種別：競争的資金

10の14乗から17乗電子ボルトの超高エネルギー宇宙線が起こす空気シャワーの精密理解のために、LHC13TeV陽子陽子衝突、及びRHIC510GeV偏極陽子陽子衝突での超前方に放出される中性粒子の研究を行ない、LHCとRHICの衝突エネルギー間での超前方ガンマ線生成のファイマンスケーリング則の成立、ATLAS実験との連動解析、RHIC横偏極衝突での超前方中性パイ中間子放出の左右非対称性の発見、などの成果を得た。また超前方粒子生成を担う回折散乱が空気シャワー発達に及ぼす影響について理解を進めた。加えて、LHC Run-3や陽子-酸素原子核衝突などの将来の測定への準備を行なった。
核子―核子衝突での超前方粒子生成は、最もありふれた散乱事象であり、二次粒子が最も大きな縦運動量を担う過程として、宇宙線の空気シャワー発達や、大気ニュートリノ生成などに重要である。本課題では、2種の衝突型加速器LHCとRHICと用いて、10**14eVから10**17にいたるエネルギー領域で超高エネルギー宇宙線の超前方生成中性粒子を研究するLHCfおよびRHICf実験を推進し、その包括的解明を進めてきた。これらは世界で初めての貴重な測定データであり、宇宙線物理から高エネルギースピン物理まで幅広い分野を横断したユニークな横断研究の創出にもつながっている。
LHC13TeV陽子衝突での超前方粒子生成とファイマンスケーリングの研究

2014年4月 - 2018年3月

科学研究費補助金基盤研究(A)

伊藤　好孝

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担当区分：研究分担者
LHC13TeV陽子衝突での超前方粒子生成とファイマンスケーリングの研究

研究課題/研究課題番号：26247037 2014年4月 - 2018年3月

科学研究費助成事業基盤研究(A)

伊藤好孝, さこ隆志, 毛受弘彰, 増田公明

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担当区分：研究分担者資金種別：競争的資金

超高エネルギー宇宙線の観測手段である空気シャワーの精緻な理解のため、２つの衝突型加速器、CERN LHC及びブルックヘブンRHICにおいて、超前方生成ガンマ線、中性子、及び中性π中間子のエネルギースペクトル測定を行なった。宇宙線エネルギーとして10**14eVから10**17eVに至る幅広いエネルギーにおいて宇宙線ハドロン相互作用の研究を行ない、超前方粒子スペクトルの衝突エネルギー不変性「ファイマンスケーリング」の検証を行なった。さらにLHC ATLAS検出器との連動解析を行い、回折的散乱と非回折的散乱それぞれからの超前方ガンマ線生成スペクトルを明らかにした。
超高エネルギー宇宙線の空気シャワー観測において、特に衝突エネルギーの大部分を担う超前方への粒子生成について、加速器実験データの不在による不定性が問題だった。本研究は、これまでで最高エネルギーである10**17eV相当の宇宙線が起こす超前方粒子生成について、LHCを用いた測定を行い初めて明らかにした。さらに、RHICでの測定を行い、単一検出器による10**14eVから10**17eVの幅広いエネルギー領域における系統的な超前方粒子生成データを取得し、衝突エネルギー依存性を明らかにした。また、RHICでの測定は偏極陽子陽子衝突での超前方測定として新しい核子構造研究の道を開くと期待される。
LHC 軽原子核衝突超前方測定にむけたシリコンピクセルカロリーメータの開発

2013年4月 - 2017年3月

科学研究費補助金基盤研究(B)

さこ隆志

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担当区分：研究分担者

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

2013年4月 - 2017年3月

日本学術振興会科学研究費助成事業基盤研究(B)

さこ隆志, 伊藤好孝, 増田公明, 田島宏康

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担当区分：研究分担者資金種別：競争的資金

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

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