First measurement of neutron capture multiplicity in neutrino-oxygen neutral-current quasielasticlike interactions using an accelerator neutrino beam

We report the first measurement of neutron capture multiplicity in neutrino-oxygen neutral-current quasielasticlike interactions at the gadolinium-loaded Super-Kamiokande detector using the T2K neutrino beam, which has a peak energy of about 0.6 GeV. A total of 30 neutral-current quasielasticlike event candidates were selected from T2K data corresponding to an exposure of <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mn>1.76</a:mn><a:mo>×</a:mo><a:msup><a:mn>10</a:mn><a:mn>20</a:mn></a:msup></a:math> protons on target. The <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:mi>γ</c:mi></c:math> ray signals resulting from neutron captures were identified using a neural network. The flux-averaged mean neutron capture multiplicity was measured to be <e:math xmlns:e="http://www.w3.org/1998/Math/MathML" display="inline"><e:mrow><e:msubsup><e:mrow><e:mn>1.37</e:mn><e:mo>±</e:mo><e:mn>0.33</e:mn><e:mtext> </e:mtext><e:mo stretchy="false">(</e:mo><e:mi>stat</e:mi><e:mo>.</e:mo><e:mo stretchy="false">)</e:mo></e:mrow><e:mrow><e:mo>−</e:mo><e:mn>0.27</e:mn></e:mrow><e:mrow><e:mo>+</e:mo><e:mn>0.17</e:mn></e:mrow></e:msubsup><e:mtext> </e:mtext><e:mo stretchy="false">(</e:mo><e:mi>syst</e:mi><e:mo>.</e:mo><e:mo stretchy="false">)</e:mo></e:mrow></e:math>, which is compatible within 2.3 sigma than predictions obtained using our nominal simulation. We discuss potential sources of systematic uncertainty in the prediction and demonstrate that a significant portion of this discrepancy arises from the modeling of hadron-nucleus interactions in the detector medium.

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Journal
Physical review. D/Physical review. D.
Published
2025-07-18
DOI
https://doi.org/10.1103/qh28-4znk
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7
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Neutrino Physics Research
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article
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13.09

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article

First measurement of neutron capture multiplicity in neutrino-oxygen neutral-current quasielasticlike interactions using an accelerator neutrino beam

Yuta Kawamura, S.C. Joshi, Lucile Mellet, T. Holvey et al.
7 citations
Physical review. D/Physical review. D.
Neutrino Physics Research
13.09
article

First measurement of neutron capture multiplicity in neutrino-oxygen neutral-current quasielasticlike interactions using an accelerator neutrino beam

Yuta Kawamura, S.C. Joshi, Lucile Mellet, T. Holvey, F. Cadoux, K. Mavrokoridis, V. Mikola, S. Levorato, S. Bordoni, M. R. Vagins, Robert J. Harris, K. Ieki, N. Kishore Babu, N. Tran, T. Ishida, M. Nakahata, R. Matsumoto, M. Lawe, Prokar Dasgupta, Adrien Blanchet, Xingyu Zhao, Yuta Kudo, Y. Hino, A. Izmaylov, A. Rychter, L. Magaletti, D. Martin, S. Ito, Hiroaki Kobayashi, M. Guigue, A. Dergacheva, Rajat Banerjee, S. Lewis, Anne Chalumeau, R. Kurjata, D. Barrow, M. Scott, M. Kabirnezhad, L. Bathe-Peters, T. Nakadaira, L. Koch, Y. Hayato, Daisuke Wakabayashi, W. Li, K. Duffy, L. Kneale, J. Łagoda, S. Emery-Schrenk, V. Q. Nguyen, B. Li, S. Wada, P. Govindaraj, H. Zhong, T. A. Doyle, M. Batkiewicz, T. Nosek, K. S. McFarland, Takashi Honjo, C. McGrew, M. Feltre, Th. A. Mueller, E. Rondio, E. A. G. Goodman, A. Shvartsman, Y. Noguchi, J. Kisiel, M Kawaue, G. Eurin, A. Khotjantsev, Takahiko Matsubara, Y. Ashida, Aníbal Kawabata, J. E. Elias, Y. Nagai, N. Skrobova, S. Miki, J. F. Laporte, N. Jachowicz, V. Glagolev, David Langridge, J. A. Caballero, F. Nova, J. T. Sobczyk, Y. Oyama, J. C. Nugent, J. Walsh, Y. Shiraishi, I. Suslov, S. Roth, Y. Nishimura, C. Touramanis, P. N. Ratoff, R. Akutsu, Paul Bates, S. Arimoto, S. Han, R. González-Jiménez, K. Niewczas, J. Chakrani, D. Henaff, Nguyễn Thị Hồng Vân, A. Blondel, A. Klustová, Jun Hu, P. Morrison, K. Hosokawa, Y. Yoshimoto, J. Pasternak, T. Schefke, D. Fedorova, T. Arihara, M. Varghese, Julie Y. Ji, Yosuke Sato, S. Han, L. Munteanu, A. Bubak, Doan Trang Nguyen, Taiyu Zhu, K. Lachner, F. Pupilli, P. Dunne, D. Last, H. M. O’Keeffe, A. Chvirova, T. Sekiya, Nobuhiko Onda, S. Karpova, W. Saenz, S. Cap, T. Yano, K. Skwarczynski, C. Forza, B. Popov, E. Villa, S. Abe, M. Ishitsuka, T. Katori, V. Berardi, T. Hasegawa, X. L. Lu, Alfonso Muñoz, Tokonatsu Yamamoto, Michael Pfaff, Y. Nakano, Luigi Lavitola, C. Riccio, Y. Takeuchi, A. Mefodiev, C. Giganti, P. de Perio, P. T. Quyen, R. Okazaki, V. V. Tereshchenko, L. L. Kormos, M. Martini, M. A. Ramirez, T. Dealtry, S. Manly, Y. Furui, T. Tsukamoto, M. Ziembicki, S. King, Mário Lachat, D. Cherdack, K. Gorshanov, G. D. Megias, D. D’Ago, D. Ferlewicz, S. Cao, K. Nakagiri, D. Leon Silverio, S. Bolognesi, E. Kearns, A. Weber, Joseph W. McKean, Hiroshi Itô, Andrew Cudd, R. M. Ramsden, Jingkai Xia, N. Thamm, E. W. Miller, L. Ludovici, E. T. Atkin, D. Riley, U. Yevarouskaya, S. Tairafune, Hari Prasad, K. Scholberg, V. Kiseeva, D Carabadjac, G. Erofeev, J. García-Marcos, W. Okinaga, N. Baudis, M. C. F. Hooft, I. Heitkamp, K. A. Apte, V. S. Kasturi, J. Mirabito, H. Alarakia-Charles, Y. I. Alj Hakim, M. Kolupanova, L. Osu, A. J. Portocarrero Yrey, Y. Stroke, Lei Feng, Jiawen Zhang, H. Kakuno, Y. F. Yang, Alok Kumar Srivastava, A. D. Marino, C. Jesús-Valls, A. Eguchi, A. Langella, Y. Kudenko, H. Zheng, C. Wret, S. Bhattacharjee, V. A. Baranov, Atsushi Nakano, A. Ershova, Noriko Yoshimura, S. L. Liu, H. T. Wallace, G Zarnecki, U. Virginet, S. J. Jenkins, N. Ospina, F. Di Lodovico, Meng Jia, G. Anthony Reina, Naoki Otani, E. Sandford, Gary Barker, G. Vasseur, T. Lux, S.B Boyd, Armando Lopes Moreno, J. J. Jiang, S. Moriyama, A. Minamino, K. Dygnarowicz, Y. S. Prabhu, S. Nishimori, M. O. Wascko, B. Radics, S. Y. Suzuki, S. Mine, C. Mauger, S. Zsoldos, C. Wilkinson, L. O’Sullivan, Yu. I. Davydov, A. C. Germer, S.M Lakshmi, K. Nakayoshi, A. Shaikhiev, K. Kowalik, P. Jonsson, Y. Koshio, C. Yanagisawa, L. Pickering, D. A. Harris, M. Lamers James, Y. Fujii, J. P. Coleman, M. J. Wilking, D. Smyczek, Tomislav Vladisavljevic, M. Khabibullin, G. De Rosa, O. Mineev, M. Zito, N. McCauley, J. Kameda, H. K. Tanaka, A. Rubbia, A. K. Ichikawa, Flynn Guo, L. Labarga, E. D. Zimmerman, S. Dolan, S. Nakayama, T. Nakaya, N. Latham, G. Barr, M. Posiadała-Zezula, Y. Fukuda, L. Russo, Thomas Peter Jones, M. Ikeda, R. Wendell, A. Longhin, K. Sakashita, F. Sánchez, J. Holeczek, M. Laveder, A. Konaka, J. Zalipska, E. Radicioni, A. Suzuki, M. Friend, M. Miura, Lluisa Maria Mir Martinez, K. Yamamoto, C. Lin, C. Bronner, M. Tada, H. Sekiya, M. Tzanov, K. Mahn, T. Wachala, K. Wood, A. J. Finch, L. Berns, M. Gonin, M. G. Catanesi, B. Quilain, T. Sekiguchi, Ciaran Hasnip, R. Zaki, Marco Grassi, H. Tanigawa, A. Kaboth, V. Matveev, C. E. R. Naseby, R. Spina, H. W. Sobel, Y. Seiya, T. Okusawa, C. Dalmazzone, T. Daret, J. Dumarchez, J. González Rosa, D. Sgalaberna, L. N. Machado, A. Zalewska, V. Kurochka, D. Munford, C. Davis, J. R. Wilson, T. Kikawa, M. Shiozawa, D. Payne, K. D. Nakamura, D. Wark, S. L. Cartwright, C. Metelko, Y. Nakajima, L. Anthony, D. Douqa, I.I. Vasilyev, C. Densham, V. Paolone, S. Samani, O. Drapier, M. Mezzetto, M. P. Casado, T. Arai, S. Kodama, D. A. Martinez Caicedo, K. Takeya, N. Roy, K. Okumura, K. Abe, Y. Uchida, Y. Kataoka, G. Lopez, A. Holin, N. F. Calabria, S. Alonso Monsalve, M. D. Fitton, N. C. Hastings, S. Fujita, K. K. Mahtani, S. Fedotov, M. Smy, A. J. Speers, M. Reh, S. Aoki, G Collazuol, T. Kutter, A. Takeda, S. Moriyama, S. Hassani, M. Buizza Avanzini, K. Choi, N. Yershov, A. A. L. Craplet, M Girgus, P. M. M. Boistier, D. Seppala, Abhay K. Jha, L. Giannessi, F. Cormier
article en
7 citations

Abstract

We report the first measurement of neutron capture multiplicity in neutrino-oxygen neutral-current quasielasticlike interactions at the gadolinium-loaded Super-Kamiokande detector using the T2K neutrino beam, which has a peak energy of about 0.6 GeV. A total of 30 neutral-current quasielasticlike event candidates were selected from T2K data corresponding to an exposure of <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mn>1.76</a:mn><a:mo>×</a:mo><a:msup><a:mn>10</a:mn><a:mn>20</a:mn></a:msup></a:math> protons on target. The <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:mi>γ</c:mi></c:math> ray signals resulting from neutron captures were identified using a neural network. The flux-averaged mean neutron capture multiplicity was measured to be <e:math xmlns:e="http://www.w3.org/1998/Math/MathML" display="inline"><e:mrow><e:msubsup><e:mrow><e:mn>1.37</e:mn><e:mo>±</e:mo><e:mn>0.33</e:mn><e:mtext> </e:mtext><e:mo stretchy="false">(</e:mo><e:mi>stat</e:mi><e:mo>.</e:mo><e:mo stretchy="false">)</e:mo></e:mrow><e:mrow><e:mo>−</e:mo><e:mn>0.27</e:mn></e:mrow><e:mrow><e:mo>+</e:mo><e:mn>0.17</e:mn></e:mrow></e:msubsup><e:mtext> </e:mtext><e:mo stretchy="false">(</e:mo><e:mi>syst</e:mi><e:mo>.</e:mo><e:mo stretchy="false">)</e:mo></e:mrow></e:math>, which is compatible within 2.3 sigma than predictions obtained using our nominal simulation. We discuss potential sources of systematic uncertainty in the prediction and demonstrate that a significant portion of this discrepancy arises from the modeling of hadron-nucleus interactions in the detector medium.

Physical review. D/Physical review. D.Vol. 112(3)
Eötvös Loránd University (HU), Warsaw University of Technology (PL), University of Geneva (CH), Louisiana State University (US), Vietnam National University Ho Chi Minh City (VN), Rutherford Appleton Laboratory (GB), State University of New York (US), University of Padua (IT), High Energy Accelerator Research Organization (JP), University of British Columbia (CA), University of Liverpool (GB), Lawrence Berkeley National Laboratory (US), Miyagi University of Education (JP), Tokyo University of Science (JP), Okayama University (JP), University of Pittsburgh (US), Duke University (US), Yokohama National University (JP), King's College London (GB), Royal Holloway University of London (GB), South Dakota School of Mines and Technology (US), Institute for High Energy Physics (ES), York University (CA), Johannes Gutenberg University Mainz (DE), Tohoku University (JP), Keio University (JP), Kyoto University (JP), Université Paris-Saclay (FR), University of Minnesota System (US), Ghent University Hospital (BE), University of Colorado System (US), University of California System (US), Joint Institute for Nuclear Research (RU), California University of Pennsylvania (US), University of Warwick (GB), Sorbonne Université (FR), University of Oxford (GB), Shanghai Institute for Science of Science (CN), National Centre for Nuclear Research (PL), Institute of Particle Physics (CA), Institute for Nuclear Research (RU), Istituto Nazionale di Fisica Nucleare, Sezione di Padova (IT), Institute of Nuclear Physics, Polish Academy of Sciences (PL), Istituto Nazionale di Fisica Nucleare, Sezione di Napoli (IT), Istituto Nazionale di Fisica Nucleare, Sezione di Bari (IT), Laboratoire Leprince-Ringuet (FR), Istituto Nazionale di Fisica Nucleare, Sezione di Roma I (IT), University of Toyama (JP), Osaka Metropolitan University (JP), Laboratoire Médiations (FR), Institute of Science Tokyo (JP), University of Houston (US), University of Warsaw (PL), Imperial College London (GB), University of Rochester (US), Stony Brook University (US), Universidad Autónoma de Madrid (ES), Kobe University (JP), European Organization for Nuclear Research (CH), Lancaster University (GB), Polytechnic University of Bari (IT), Tokyo Metropolitan University (JP), Vietnam Academy of Science and Technology (VN), The University of Tokyo (JP), University of Glasgow (GB), Universidad de Sevilla (ES), University of Silesia in Katowice (PL), Michigan State University (US), RWTH Aachen University (DE), University of Sheffield (GB), Stanford University (US)
U.S. Department of Energy, Scientific Education and Research Institute, National Foundation for Science and Technology Development, Universidad de Sevilla, “la Caixa” Foundation, Vietnam Academy of Science and Technology, CERN, UK Research and Innovation, Centres de Recerca de Catalunya, National Energy Research Scientific Computing Center, Canada Foundation for Innovation, Royal Society, European Commission, Deutsche Forschungsgemeinschaft, Agence Nationale de la Recherche, Ministry of Education, Culture, Sports, Science and Technology, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, Generalitat de Catalunya, Consejería de Economía, Innovación, Ciencia y Empleo, Junta de Andalucía, Federación Española de Enfermedades Raras, Narodowe Centrum Nauki, Stavros Niarchos Foundation, Ministerstwo Edukacji i Nauki, University of Tokyo, Centre National de la Recherche Scientifique, Ministerio de Ciencia e Innovación, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Russian Science Foundation, Nemzeti Kutatási Fejlesztési és Innovációs Hivatal, University of the East, Sorbonne Université, Alliance de recherche numérique du Canada, Horizon 2020 Framework Programme, Natural Sciences and Engineering Research Council of Canada, National Research Council Canada, Science and Technology Facilities Council, European Research Council, Deutsches Elektronen-Synchrotron, Japan Society for the Promotion of Science, Instituto Nazionale di Fisica Nucleare, European Regional Development Fund, Agencia Estatal de Investigación, Institut National de Physique Nucléaire et de Physique des Particules, Institute for Cosmic Ray Research, University of Tokyo, European Social Fund, H2020 European Research Council, HORIZON EUROPE Marie Sklodowska-Curie Actions
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