Search for proton decay into e+π0

R. M. Bionta, G. Blewitt, C. B. Bratton, B. G. Cortez, S. Errede, G. W. Forster, W. Gajewski, M. Goldhaber, J. Greenberg, T. J. Haines, T. W. Jones, D. Kielczewska, W. R. Kropp, J. G. Learned, E. Lehmann, J. M. Losecco, P. V.Ramana Murthy, H. S. Park, F. Reines, J. SchultzE. Shumard, D. Sinclair, D. W. Smith, H. W. Sobel, J. L. Stone, L. R. Sulak, R. Svoboda, J. C. Van Der Velde, C. Wuest

Research output: Contribution to journalArticlepeer-review


Observations were made 1570 meters of water equivalent underground with an 8000-metric-ton water Cherenkov detector. During a live time of 80 d no events consistent with the decay p→e+π0 were found in a fiducial mass of 3300 metric tons. It is concluded that the limit on the lifetime for bound plus free protons divided by the e+π0 branching ratio is τB>6.5×1031 yr; for free protons the limit is τB>1.9×1031 yr (90% confidence). Observed cosmic-ray muons and neutrinos are compatible with expectations.

Original languageEnglish (US)
Pages (from-to)27-30
Number of pages4
JournalPhysical review letters
Issue number1
StatePublished - 1983
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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