抄録
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.
本文言語 | English |
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論文番号 | 072006 |
ジャーナル | Physical Review D - Particles, Fields, Gravitation and Cosmology |
巻 | 91 |
号 | 7 |
DOI | |
出版ステータス | Published - 4月 10 2015 |
ASJC Scopus subject areas
- 核物理学および高エネルギー物理学
- 物理学および天文学(その他)