Search for solar electron anti-neutrinos due to spin-flavor precession in the Sun with Super-Kamiokande-IV

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Abe, K, Bronner, C, Hayato, Y, Ikeda, M, Imaizumi, S, Ito, H, Kameda, J, Kataoka, Y, Miura, M, Moriyama, S et al (show 188 more authors) , 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-Berguno, D, Labarga, L, Marti, Ll, 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, 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, Th A, 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, Jakkapu, M, Kobayashi, T, Matsubara, T, Nakadaira, T, 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, Y, Fernandez, P, McCauley, N ORCID: 0000-0002-5982-5125, Mehta, P, Pritchard, A, Tsui, KM, Fukuda, Y, Itow, Y, Menjo, H, Niwa, T, Sato, K, Tsukada, M, Mijakowski, P, 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, Taani, M, Migenda, J, Sedgwick, S Molina, Zsoldos, S, Yang, JY, Jenkins, SJ ORCID: 0000-0002-0982-8141, Malek, M, McElwee, JM, Stone, O, Thiesse, MD, Thompson, LF, Okazawa, H, Kim, SB, Yu, I, 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, Tanaka, HA, Towstego, T, Hartz, M, Konaka, A, de Perio, P, Prouse, NW, Chen, S, Xu, BD, Richards, B, Jamieson, B, Walker, J, Minamino, A, Pintaudi, G and Sasaki, R (2022) Search for solar electron anti-neutrinos due to spin-flavor precession in the Sun with Super-Kamiokande-IV ASTROPARTICLE PHYSICS, 139. 102702-. ISSN 0927-6505, 1873-2852

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Abstract

Due to a very low production rate of electron anti-neutrinos (ν̄<inf>e</inf>) via nuclear fusion in the Sun, a flux of solar ν̄<inf>e</inf> is unexpected. An appearance of ν̄<inf>e</inf> 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 (ν<inf>e</inf>→ν̄<inf>e</inf>) when neutrino has a finite magnetic moment. In this work, we have searched for solar ν̄<inf>e</inf> in the Super-Kamiokande experiment, using neutron tagging to identify their inverse beta decay signature. We identified 78 ν̄<inf>e</inf> 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 ν<inf>e</inf>→ν̄<inf>e</inf> conversion probability in the Sun. We used this result to evaluate the sensitivity of future experiments, notably the Super-Kamiokande Gadolinium (SK-Gd) upgrade.

Item Type:	Article
Uncontrolled Keywords:	Neutron tagging, Water Cherenkov detector, Electron antineutrinos, Neutrino-antineutrino oscillation, Solar neutrino
Depositing User:	Symplectic Admin
Date Deposited:	21 Oct 2022 08:37
Last Modified:	16 Jun 2026 14:24
DOI:	10.1016/j.astropartphys.2022.102702
Open Access URL:	https://www.sciencedirect.com/science/article/pii/...
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3165680
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