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Bronner, C.; Hayato, Y.; Ikeda, M.; Kataoka, Y.; Miura, M.; Nakahata, M.; Nakajima, Y.; Nakayama, S.; Okamoto, K.; Orii, A.; Sekiya, H.; Sonoda, Y.; Tanaka, H.; Akutsu, R.; Kajita, T.; Okumura, K.; Bravo-Berguño, D.; Labarga, L.; Marti, Ll; Blaszczyk, F.d.M.; Kearns, E.; Stone, J.L.; Wester, T.; Pointon, B.W.; Bian, J.; Griskevich, N.J.; Kropp, W.R.; Locke, S.; Mine, S.; Smy, M.B.; Sobel, H.W.; Hill, J.; Kim, J.Y.; Scholberg, K.; Bernard, L.; Gonin, M.; Mueller, Th.A.; Jang, J.S.; Anthony, L.H.V.; Sztuc, A.A.; Berardi, V.; Collazuol, G.; Lamoureux, M.; Cao, S.; Ishida, T.; Jakkapu, M.; Kobayashi, T.; Matsubara, T.; Nakamura, K.; Sakashita, K.; Tsukamoto, T.; Shiozawa, T.; Suzuki, A.T.; Takeuchi, Y.; Yamamoto, S.; Ali, A.; Feng, J.; Ichikawa, A.K.; Mori, M.; Nakaya, T.; Fernandez, P.; Mehta, P.; Tsui, K.M.; Fukuda, Y.; Menjo, H.; Niwa, T.; Sato, K.; Mijakowski, P.; Vilela, C.; Wilking, M.J.; Harada, M.; Hagiwara, K.; Horai, T.; Ishino, H.; Ito, S.; Barrow, D.; Goldsack, A.; Nova, F.; Boschi, T.; Di Lodovico, F.; Taani, M.; Yang, J.Y.; Jenkins, S.J.; Malek, M.; McElwee, J.M.; Stone, O.; Okazawa, H.; Kim, S.B.; Koshiba, M.; Ogawa, N.; Yokoyama, M.; Inomoto, M.; Matsumoto, R.; Ohta, K.; Towstego, T.; Konaka, A.; Chen, S.; Jamieson, B.; Walker, J.; Okamoto, K.
Astroparticle physics, 06/2022, Letnik: 139Journal Article
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.
