W. Hwang⁶, H. I. Jang⁵, J. S. Jang⁸, K. K. Joo⁹, D. E. Jung¹⁰, S. K. Kang¹¹, Y. Kasugai⁷, T. Kawasaki¹², E. M. Kim⁹, E. J. Kim¹³, S. Y. Kim⁹, S. B. Kim¹⁴, H. Kinoshita⁷, T. Konno¹², D. H. Lee^15,*, C. Little¹⁶, T. Maruyama¹⁵, E. Marzec¹⁶, S. Masuda⁷, S. Meigo⁷, D. H. Moon⁹, T. Nakano¹⁷, M. Niiyama¹⁸, K. Nishikawa¹⁵, M. Y. Pac⁴, B. J. Park¹⁹, H. W. Park⁹, J. B. Park³, J. S. Park⁹, J. S. Park¹⁹, R. G. Park⁹, S. J. M. Peeters²⁰, J. W. Ryu¹⁹, K. Sakai⁷, S. Sakamoto⁷, T. Shima¹⁷, C. D. Shin¹⁵, J. Spitz¹⁶, F. Suekane¹, Y. Sugaya¹⁷, K. Suzuya⁷, Y. Yamaguchi⁷, I. S. Yeo⁴, and I. Yu¹⁰ (${\mathrm{JSNS}}^2$ Collaboration)

• ¹Research Center for Neutrino Science, Tohoku University, 6-3 Azaaoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8578, Japan
• ²Advanced Science Research Center, JAEA, 2-4 Shirakata, Tokai-mura, Naka-gun, Ibaraki 319-1195, Japan
• ³Department of Physics and OMEG Institute, Soongsil University, 369 Sangdo-ro, Dongjak-gu, Seoul, 06978, Korea
• ⁴Laboratory for High Energy Physics, Dongshin University, 67, Dongshindae-gil, Naju-si, Jeollanam-do, 58245, Korea
• ⁵Department of Fire Safety, Seoyeong University, 1 Seogang-ro, Buk-gu, Gwangju, 61268, Korea
• ⁶Department of Physics, Kyung Hee University, 26, Kyungheedae-ro, Dongdaemun-gu, Seoul 02447, Korea
• ⁷J-PARC Center, JAEA, 2-4 Shirakata, Tokai-mura, Naka-gun, Ibaraki 319-1195, Japan
• ⁸GIST College, Gwangju Institute of Science and Technology, 123 Cheomdangwagi-ro, Buk-gu, Gwangju, 61005, Korea
• ⁹Department of Physics, Chonnam National University, 77, Yongbong-ro, Buk-gu, Gwangju, 61186, Korea
• ¹⁰Department of Physics, Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do, 16419, Korea
• ¹¹School of Liberal Arts, Seoul National University of Science and Technology, 232 Gongneung-ro, Nowon-gu, Seoul, 139-743, Korea
• ¹²Department of Physics, Kitasato University, 1 Chome-15-1 Kitazato, Minami Ward, Sagamihara, Kanagawa, 252-0329, Japan
• ¹³Division of Science Education, Jeonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju-si, Jeollabuk-do, 54896, Korea
• ¹⁴School of Physics, Sun Yat-sen (Zhongshan) University, Haizhu District, Guangzhou, 510275, China
• ¹⁵High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba, Ibaraki, 305-0801, Japan
• ¹⁶University of Michigan, 500 S. State Street, Ann Arbor, Michigan 48109, USA
• ¹⁷Research Center for Nuclear Physics, Osaka University, 10-1 Mihogaoka, Ibaraki, Osaka, 567-0047, Japan
• ¹⁸Department of Physics, Kyoto Sangyo University, Motoyama, Kamigamo, Kita-Ku, Kyoto-City, 603-8555, Japan
• ¹⁹Department of Physics, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu, 41566, Korea
• ²⁰Department of Physics and Astronomy, University of Sussex, Falmer, Brighton, BN1 9RH, United Kingdom

• ^*Contact author: leedh@post.kek.jp