研究者詳細 - 毛受　弘彰

論文 - 毛受　弘彰

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

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

PHYSICAL REVIEW D 109 巻 ( 1 ) 2024年1月

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

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

DOI： 10.1103/PhysRevD.109.012003

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

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

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

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

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

DOI： 10.1088/1748-0221/16/10/P10027

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

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

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

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

The mass composition of ultra-high-energy cosmic rays is important for understanding their origin. Owing to our limited knowledge of the hadronic interaction, the interpretations of the mass composition from observations include several open problems, such as the inconsistent interpretations of 〈Xmax〉 and 〈Xmaxμ〉. Furthermore, a large difference between the predictions exists in the hadronic interaction models. Diffractive collision is one of the proposed sources of the uncertainty. In this paper, we discuss the effect of the detailed characteristics of diffractive collisions on the observables of ultra-high-energy cosmic-ray experiments, focusing on three detailed characteristics. These are the cross-sectional fractions of different collision types, the diffractive-mass spectrum, and diffractive-mass-dependent particle production from the diffractive dissociation system. We demonstrate that the current level of uncertainty in the cross-sectional fraction can affect 〈Xmax〉 by 8.9 g/cm2 and 〈Xmaxμ〉 by 9.4 g/cm2, whereas the other details of diffractive collisions exhibit relatively minor effects.

DOI： 10.1093/ptep/ptab013

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

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

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

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

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

DOI： 10.1007/JHEP07(2020)016

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

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

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

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

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

DOI： 10.1103/PhysRevLett.124.252501

Measurement of forward photon production cross-section in proton-proton collisions at √<i>s</i>=13 TeV with the LHCf detector 査読有り国際共著国際誌 Open Access

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

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

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

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

DOI： 10.1016/j.physletb.2017.12.050

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

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

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

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

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

DOI： 10.1140/epjc/s10052-017-4788-7

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

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

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

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

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

DOI： 10.1016/j.nima.2016.04.074

First Joint Oscillation Analysis of Super-Kamiokande Atmospheric and T2K Accelerator Neutrino Data 査読有り国際共著国際誌 Open Access

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

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

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

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

DOI： 10.1103/PhysRevLett.134.011801

Measurements of the charge ratio and polarization of cosmic-ray muons with the Super-Kamiokande detector 査読有り国際共著国際誌 Open Access

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

PHYSICAL REVIEW D 110 巻 ( 8 ) 2024年10月

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

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

DOI： 10.1103/PhysRevD.110.082008

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

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

PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS 2024 巻 ( 10 ) 2024年10月

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

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

DOI： 10.1093/ptep/ptae128

Combined Pre-supernova Alert System with KamLAND and Super-Kamiokande 査読有り国際共著国際誌 Open Access

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

ASTROPHYSICAL JOURNAL 973 巻 ( 2 ) 2024年10月

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

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

DOI： 10.3847/1538-4357/ad5fee

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

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

Proceedings of Science 444 巻 2024年9月

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

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

DOI： 10.22323/1.444.0294

First result of a search for Diffuse Supernova Neutrino Background in SK-Gd experiment 国際共著国際誌 Open Access

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

Proceedings of Science 444 巻 2024年9月

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

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

DOI： 10.22323/1.444.1173

Evaluation of neutron tagging efficiency on 0.03% Gd mass concentration in SK-Gd experiment 国際共著国際誌 Open Access

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

Proceedings of Science 444 巻 2024年9月

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

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

DOI： 10.22323/1.444.1172

Measurement of cosmogenic <sup>9</sup>Li in Super-Kamiokande with gadolinium loaded water 国際共著国際誌 Open Access

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

Proceedings of Science 444 巻 2024年9月

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

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

DOI： 10.22323/1.444.1058

Time-dependent and Time-independent Directional Search for High-Energy Astrophysical Neutrino Point Sources in Super-Kamiokande 国際共著国際誌 Open Access

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

Proceedings of Science 444 巻 2024年9月

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

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

DOI： 10.22323/1.444.1079

The LHCf experiment at the Large Hadron Collider: status and prospects 国際共著国際誌 Open Access

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

Proceedings of Science 444 巻 2024年9月

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

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

DOI： 10.22323/1.444.0444

Study of the neutrino-oxygen neutral-current quasielastic cross section using atmospheric neutrinos in the SK-Gd experiment 査読有り国際共著国際誌 Open Access

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

Proceedings of Science 444 巻 2024年9月

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

The atmospheric neutrino-oxygen neutral-current quasielasatic (NCQE) reactions are one of the main background in the search for supernova relic neutrinos. Here, we report the first measurement of the atmospheric neutrino-oxygen NCQE cross section in the Super-Kamiokande Gadolinium (SK-Gd) experiment using 552.2 days of full SK-VI data. The measured NCQE cross section is 0.74 ± 0.22(stat.) +−0.860.16(syst.) × 10−38 cm2, which is consistent with the theoretical NCQE cross section and the previous study in SK within the range of the uncertainty. Furthermore, we established the verification method for nucleon-nucleus interaction models using atmospheric neutrino events. We performed the verification using the Bertini Cascade model (BERT), the Binary Cascade model (BIC) and the Liège Intranuclear Cascade model (INCL++). As a result, we suggested that BIC and INCL++ are closer to the observed data.

DOI： 10.22323/1.444.1088

Status and Prospect of SK-Gd Project 国際共著国際誌 Open Access

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

Proceedings of Science 444 巻 2024年9月

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

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

DOI： 10.22323/1.444.0983

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