Neutron-antineutron oscillation search using a 0.37 megaton-years exposure of Super-Kamiokande

(Super-Kamiokande Collaboration)

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20 Citations (Scopus)


As a baryon number violating process with ΔB=2, neutron-antineutron oscillation (n→n¯) provides a unique test of baryon number conservation. We have performed a search for n→n¯ oscillation with bound neutrons in Super-Kamiokande, with the full dataset from its first four run periods, representing an exposure of 0.37 Mton-years. The search used a multivariate analysis trained on simulated n→n¯ events and atmospheric neutrino backgrounds and resulted in 11 candidate events with an expected background of 9.3 events. In the absence of statistically significant excess, we derived a lower limit on n¯ appearance lifetime in O16 nuclei of 3.6×1032 years and on the neutron-antineutron oscillation time of τn→n¯>4.7×108 s at 90% C.L.

Original languageEnglish
Article number012008
JournalPhysical Review D
Issue number1
Publication statusPublished - 2021 Jan 21

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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