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  • Search for n-nbar oscillation in Super-Kamiokande
    Super-Kamiokande collaboration; Abe, K; Hayato, Y; Iida, T; Koshio, Y; Minamino, A; Mitsuda, C; Miura, M; Moriyama, S; Nakahata, M; Obayashi, Y; Ogawa, H; Sekiya, H; Shiozawa, M; Takeda, A; Takeuchi, Y; Ueshima, K; Higuchi, I; Ishihara, C; Kaneyuki, K; Mitsuka, G; Nakayama, S; Nishino, H; Okumura, K; Saji, C; Takenaga, Y; Clark, S; Herfurth, A; Likhoded, S; Litos, M; Raaf, J L; Stone, J L; Sulak, L R; Goldhaber, M; Casper, D; Griskevich, J; Kropp, W R; Liu, D W; Mine, S; Regis, C; Smy, M B; Sobel, H W; Vagins, M R; Hartfiel, B; Hill, J; Jang, J S; Jeoung, I S; Kim, J Y; Walter, C W; Guillian, G; Learned, J G; Matsuno, S; Messier, M D; Ichikawa, A K; Ishii, T; Iwashita, T; Kobayashi, T; Nakadaira, T; Nakamura, K; Nitta, K; Oyama, Y; Suzuki, A T; Maesaka, H; Nakaya, T; Sasaki, T; Sato, H; Tanaka, H; Yamamoto, S; Yokoyama, M; Svoboda, R; Sullivan, G W; Fukuda, Y; Koike, T; Jung, C K; Kato, T; Kobayashi, K; McGrew, C; Sarrat, A; Terri, R; Yanagisawa, C; Kuno, Y; Yoshida, M; Kim, S B; Yang, B S; Ishizuka, T; Okazawa, H; Seo, H K; Gando, Y; Hasegawa, T; Inoue, K; Ishii, H; Ishino, H; Watanabe, Y; Koshiba, M; Totsuka, Y; Chen, S; Deng, Z; Berns, H G; Shiraishi, K K; Thrane, E

    arXiv.org, 04/2015
    Paper, Journal Article

    A search for neutron-antineutron (\(n-\bar{n}\)) oscillation was undertaken in Super-Kamiokande using the 1489 live-day or \(2.45 \times 10^{34}\) neutron-year exposure data. This process violates both baryon and baryon minus lepton numbers by an absolute value of two units and is predicted by a large class of hypothetical models where the seesaw mechanism is incorporated to explain the observed tiny neutrino masses and the matter-antimatter asymmetry in the Universe. No evidence for \(n-\bar{n}\) oscillation was found, the lower limit of the lifetime for neutrons bound in \({}^{16}\)O, in an analysis that included all of the significant sources of experimental uncertainties, was determined to be \(1.9 \times 10^{32}\)~years at the 90\% confidence level. The corresponding lower limit for the oscillation time of free neutrons was calculated to be \(2.7 \times 10^8\)~s using a theoretical value of the nuclear suppression factor of \(0.517 \times 10^{23}\)~s\(^{-1}\) and its uncertainty.

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