Journal
PHYSICAL REVIEW D
Volume 91, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.91.072009
Keywords
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Funding
- Japanese Ministry of Education, Culture, Sports, Science and Technology
- United States Department of Energy
- U.S. National Science Foundation
- Research Foundation of Korea
- Korean Ministry of Science and Technology
- National Science Foundation of China
- European Union [284518, GA-2011-289442]
- National Science and Engineering Research Council (NSERC) of Canada
- Scinet and West-grid consortia of Compute Canada
- Grants-in-Aid for Scientific Research [25105004] Funding Source: KAKEN
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A search for dinucleon decay into pions with the Super-Kamiokande detector has been performed with an exposure of 282.1 kiloton-years. Dinucleon decay is a process that violates baryon number by two units. We present the first search for dinucleon decay to pions in a large water-Cherenkov detector. The modes O-16(pp) -> C-14 pi(+)pi(+), O-16(pn) -> N-14 pi(+)pi(0), and O-16(nn) -> O-14 pi(0)pi(0) are investigated. No significant excess in the Super-Kamiokande data has been found, so a lower limit on the lifetime of the process per oxygen nucleus is determined. These limits are tau(pp ->pi+pi+) > 7.22 x 10(31) years, tau(pn ->pi+pi 0) > 1.70 x 10(32) years, and tau(nn ->pi 0 pi 0) > 4.04 x 10(32) years. The lower limits on each mode are about 2 orders of magnitude better than previous limits from searches for dinucleon decay in iron.
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