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  • Search for n − n ¯ oscillat...
    Abe, K.; Hayato, Y.; Iida, T.; Kameda, J.; Koshio, Y.; Minamino, A.; Mitsuda, C.; Miura, M.; Moriyama, S.; Ogawa, H.; Shiozawa, M.; Suzuki, Y.; Takeda, A.; Takeuchi, Y.; Ueshima, K.; Watanabe, H.; Higuchi, I.; Ishitsuka, M.; Kaneyuki, K.; Nakayama, S.; Nishino, H.; Okumura, K.; Saji, C.; Clark, S.; Dufour, F.; Herfurth, A.; Likhoded, S.; Raaf, J. L.; Sulak, L. R.; Wang, W.; Goldhaber, M.; Casper, D.; Dunmore, J.; Kropp, W. R.; Liu, D. W.; Mine, S.; Regis, C.; Sobel, H. W.; Vagins, M. R.; Ganezer, K. S.; Hartfiel, B.; Hill, J.; Jeoung, I. S.; Kim, J. Y.; Scholberg, K.; Tanimoto, N.; Wendell, R.; Guillian, G.; Learned, J. G.; Matsuno, S.; Messier, M. D.; Ichikawa, A. K.; Ishida, T.; Ishii, T.; Iwashita, T.; Kobayashi, T.; Nakadaira, T.; Nakamura, K.; Nishikawa, K.; Nitta, K.; Oyama, Y.; Hasegawa, M.; Maesaka, H.; Sato, H.; Tanaka, H.; Yamamoto, S.; Yokoyama, M.; Dazeley, S.; Svoboda, R.; Sullivan, G. W.; Gran, R.; Habig, A.; Itow, Y.; Koike, T.; Jung, C. K.; Kato, T.; Kobayashi, K.; McGrew, C.; Sarrat, A.; Tamura, N.; Sakuda, M.; Yoshida, M.; Yang, B. S.; Ishizuka, T.; Okazawa, H.; Choi, Y.; Gando, Y.; Inoue, K.; Ishii, H.; Ishino, H.; Watanabe, Y.; Koshiba, M.; Totsuka, Y.; Chen, S.; Deng, Z.; Liu, Y.; Kielczewska, D.; Berns, H. G.; Shiraishi, K. K.; Thrane, E.

    Physical review. D, Particles, fields, gravitation, and cosmology, 4/2015, Letnik: 91, Številka: 7
    Journal Article

    A search for neutron-antineutron (n - n) oscillation was undertaken in Super-Kamiokande using the 1489 live-day or 2.45 x 10 super(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 - n oscillation was found; the lower limit of the lifetime for neutrons bound in super(16)O, in an analysis that included all of the significant sources of experimental uncertainties, was determined to be 1.9 x 10 super(32) years at the 90% confidence level. The corresponding lower limit for the oscillation time of free neutrons was calculated to be 2.7 x 10 super(8) s using a theoretical value of the nuclear suppression factor of 0.517 x 10 super(23) s super(-1) and its uncertainty.