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Search for n-n ¯ oscillation in Super-Kamiokande SEARCH FOR n-n ¯ OSCILLATION IN SUPER-⋯ K. ABE et al.

  • Author(s): 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
  • et al.
Abstract

© 2015 American Physical Society. 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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