Search for n-nbar oscillation in Super-Kamiokande
Creators: name: Kamiokande Collaboration
name: Abe, K.
name: Hayato, Y.
name: Iida, T.
name: Ishihara, K.
name: Kameda, J.
name: Koshio, Y.
name: Minamino, A.
name: Mitsuda, C.
name: Miura, M.
name: Moriyama, S.
name: Nakahata, M.
name: Obayashi, Y.
name: Ogawa, H.
name: Sekiya, H.
name: Shiozawa, M.
name: Suzuki, Y.
name: Takeda, A.
name: Takeuchi, Y.
name: Ueshima, K.
name: Watanabe, H.
name: Higuchi, I.
name: Ishihara, C.
name: Ishitsuka, M.
name: Kajita, T.
name: Kaneyuki, K.
name: Mitsuka, G.
name: Nakayama, S.
name: Nishino, H.
name: Okumura, K.
name: Saji, C.
name: Takenaga, Y.
name: Clark, S.
name: Desai, S.
name: Dufour, F.
name: Herfurth, A.
name: Kearns, E.
name: Likhoded, S.
name: Litos, M.
name: Raaf, J. L.
name: Stone, J. L.
name: Sulak, L. R.
name: Wang, W.
name: Goldhaber, M.
name: Casper, D.
name: Cravens, J. P.
name: Dunmore, J.
name: Griskevich, J.
name: Kropp, W. R.
name: Liu, D. W.
name: Mine, S.
name: Regis, C.
name: Smy, M. B.
name: Sobel, H. W.
name: Vagins, M. R.
name: Ganezer, K. S.
name: Hartfiel, B.
name: Hill, J.
name: Keig, W. E.
name: Jang, J. S.
name: Jeoung, I. S.
name: Kim, J. Y.
name: Lim, I. T.
name: Scholberg, K.
name: Tanimoto, N.
name: Walter, C. W.
name: Wendell, R.
name: Ellsworth, R. W.
name: Tasaka, S.
name: Guillian, G.
name: Learned, J. G.
name: Matsuno, S.
name: Messier, M. D.
name: Ichikawa, A. K.
name: Ishida, T.
name: Ishii, T.
name: Iwashita, T.
name: Kobayashi, T.
name: Nakadaira, T.
name: Nakamura, K.
name: Nishikawa, K.
name: Nitta, K.
name: Oyama, Y.
name: Suzuki, A. T.
name: Hasegawa, M.
name: Maesaka, H.
name: Nakaya, T.
name: Sasaki, T.
name: Sato, H.
name: Tanaka, H.
name: Yamamoto, S.
name: Yokoyama, M.
name: Haines, T. J.
name: Dazeley, S.
name: Hatakeyama, S.
name: Svoboda, R.
name: Sullivan, G. W.
name: Gran, R.
name: Habig, A.
name: Fukuda, Y.
name: Itow, Y.
name: Koike, T.
name: Jung, C. K.
name: Kato, T.
name: Kobayashi, K.
name: McGrew, C.
name: Sarrat, A.
name: Terri, R.
name: Yanagisawa, C.
name: Tamura, N.
name: Ikeda, M.
name: Sakuda, M.
name: Kuno, Y.
name: Yoshida, M.
name: Kim, S. B.
name: Yang, B. S.
name: Ishizuka, T.
name: Okazawa, H.
name: Choi, Y.
name: Seo, H. K.
name: Gando, Y.
name: Hasegawa, T.
name: Inoue, K.
name: Ishii, H.
name: Nishijima, K.
name: Ishino, H.
name: Watanabe, Y.
name: Koshiba, M.
name: Totsuka, Y.
name: Chen, S.
name: Deng, Z.
name: Liu, Y.
name: Kielczewska, D.
name: Berns, H. G.
name: Shiraishi, K. K.
name: Thrane, E.
name: Washburn, K.
name: Wilkes, R. J.
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: 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.
description: 8 pages, 2 figures