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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 189 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, Gustafson, JD, Raaf, JL, Stone, JL, Wan, L, Wester, T, 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, 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, Kobayashi, T, Matsubara, T, Nakadaira, T, Jakkapu, M, 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, K, 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, Posiadala-Zezula, M, 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, Sedgwick, S Molina, Taani, M, Zsoldos, S, Yang, JY, Jenkins, SJ ORCID: 0000-0002-0982-8141, McElwee, JM, Thiesse, MD, Thompson, LF, Malek, M, Stone, O, Okazawa, H, Kim, SB, Yu, I, Nishijima, K, Koshiba, M, Ogawa, N, Iwamoto, K, Yokoyama, M, Martens, K, Vagins, MR, Kuze, M, Izumiyama, S, 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, Pointon, BW, Chen, S, Xu, BD, Richards, B, Jamieson, B, Walker, J, Minamino, A, Okamoto, K, Pintaudi, G and Sasaki, R
(2021)
Neutron-antineutron oscillation search using a 0.37 megaton-years exposure of Super-Kamiokande.
PHYSICAL REVIEW D, 103 (1).
012008-.
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Abstract
As a baryon number violating process with $\Delta B=2$, neutron-antineutron
oscillation ($n\to\bar n$) provides a unique test of baryon number
conservation. We have performed a search for $n\to\bar n$ oscillation with
bound neutrons in Super-Kamiokande, with the full data set from its first four
run periods, representing an exposure of 0.37~Mton-years. The search used a
multivariate analysis trained on simulated $n\to\bar n$ events and atmospheric
neutrino backgrounds and resulted in 11 candidate events with an expected
background of 9.3 events. In the absence of statistically significant excess,
we derived a lower limit on $\bar n$ appearance lifetime in $^{16}$O nuclei of
$3.6\times{10}^{32}$ years and on the neutron-antineutron oscillation time of
$\tau_{n\to\bar n} > 4.7\times10^{8}$~s at 90\% C.L..
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