Search for multitrack nucleon decay

S. Seidel, R. M. Bionta, G. Blewitt, C. B. Bratton, D. Casper, A. Ciocio, R. Claus, S. T. Dye, S. Errede, G. W. Foster, W. Gajewski, K. S. Ganezer, M. Goldhaber, T. J. Haines, T. W. Jones, D. Kielczewska, W. R. Kropp, J. G. Learned, J. M. Loseceo, J. MatthewsH. S. Park, L. Price, F. Reines, J. Schultz, E. Shumard, D. Sinclair, H. W. Sobel, J. L. Stone, L. Sulak, R. Svoboda, G. Thornton, J. C. Van Der Velde, C. Wuest

Research output: Contribution to journalArticlepeer-review


We report new limits on the nucleon lifetime obtained with the Irvine-Michigan-Brookhaven water Cherenkov detector. Techniques in track fitting, particle identification, and invariant-mass reconstruction provide information about multitrack events which leads to a significant reduction in background for most decay modes. Data obtained during the initial 417-day run and during the subsequent 69-day run with enhanced light collection are discussed. A background subtraction is made, yielding 90%-confidence-level lower bounds on the nucleon partial lifetime per branching fraction in the range (0.6-46.0)×1031 yr for 23 decay channels.

Original languageEnglish (US)
Pages (from-to)2522-2525
Number of pages4
JournalPhysical review letters
Issue number22
StatePublished - 1988
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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