- Main
Search for n−n¯ oscillation in Super-Kamiokande
- Abe, K;
- Hayato, Y;
- Iida, T;
- Ishihara, K;
- Kameda, J;
- Koshio, Y;
- Minamino, A;
- Mitsuda, C;
- Miura, M;
- Moriyama, S;
- Nakahata, M;
- Obayashi, Y;
- Ogawa, H;
- Sekiya, H;
- Shiozawa, M;
- Suzuki, Y;
- Takeda, A;
- Takeuchi, Y;
- Ueshima, K;
- Watanabe, H;
- Higuchi, I;
- Ishihara, C;
- Ishitsuka, M;
- Kajita, T;
- Kaneyuki, K;
- Mitsuka, G;
- Nakayama, S;
- Nishino, H;
- Okumura, K;
- Saji, C;
- Takenaga, Y;
- Clark, S;
- Desai, S;
- Dufour, F;
- Herfurth, A;
- Kearns, E;
- Likhoded, S;
- Litos, M;
- Raaf, JL;
- Stone, JL;
- Sulak, LR;
- Wang, W;
- Goldhaber, M;
- Casper, D;
- Cravens, JP;
- Dunmore, J;
- Griskevich, J;
- Kropp, WR;
- Liu, DW;
- Mine, S;
- Regis, C;
- Smy, MB;
- Sobel, HW;
- Vagins, MR;
- Ganezer, KS;
- Hartfiel, B;
- Hill, J;
- Keig, WE;
- Jang, JS;
- Jeoung, IS;
- Kim, JY;
- Lim, IT;
- Scholberg, K;
- Tanimoto, N;
- Walter, CW;
- Wendell, R;
- Ellsworth, RW;
- Tasaka, S;
- Guillian, G;
- Learned, JG;
- Matsuno, S;
- Messier, MD;
- Ichikawa, AK;
- Ishida, T;
- Ishii, T;
- Iwashita, T;
- Kobayashi, T;
- Nakadaira, T;
- Nakamura, K;
- Nishikawa, K;
- Nitta, K;
- Oyama, Y;
- Suzuki, AT;
- Hasegawa, M;
- Maesaka, H;
- Nakaya, T;
- Sasaki, T;
- Sato, H;
- Tanaka, H;
- Yamamoto, S;
- Yokoyama, M;
- Haines, TJ;
- Dazeley, S;
- Hatakeyama, S;
- Svoboda, R;
- Sullivan, GW;
- Gran, R;
- Habig, A;
- Fukuda, Y;
- Itow, Y;
- Koike, T;
- Jung, CK;
- Kato, T;
- Kobayashi, K;
- McGrew, C;
- Sarrat, A;
- Terri, R;
- Yanagisawa, C;
- Tamura, N;
- Ikeda, M;
- Sakuda, M;
- Kuno, Y;
- Yoshida, M;
- Kim, SB;
- Yang, BS;
- Ishizuka, T;
- Okazawa, H;
- Choi, Y;
- Seo, HK;
- Gando, Y;
- Hasegawa, T;
- Inoue, K;
- Ishii, H;
- Nishijima, K;
- Ishino, H;
- Watanabe, Y;
- Koshiba, M;
- Totsuka, Y;
- Chen, S;
- Deng, Z;
- Liu, Y;
- Kielczewska, D;
- Berns, HG;
- Shiraishi, KK;
- Thrane, E;
- Washburn, K;
- Wilkes, RJ
- et al.
Published Web Location
https://doi.org/10.1103/physrevd.91.072006Abstract
A search for neutron-antineutron (n-n¯) oscillation was undertaken in Super-Kamiokande using the 1489 live-day or 2.45×1034 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 O16, in an analysis that included all of the significant sources of experimental uncertainties, was determined to be 1.9×1032years at the 90% confidence level. The corresponding lower limit for the oscillation time of free neutrons was calculated to be 2.7×108s using a theoretical value of the nuclear suppression factor of 0.517×1023s-1 and its uncertainty.
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