- Abe, K
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- Moriyama, S
- Nakahata, M
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- Shiozawa, M
- Suzuki, Y
- Takeda, A
- Takeuchi, Y
- Ueshima, K
- Watanabe, H
- Higuchi, I
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- 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
- et al.
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.