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Dinucleon decay in the nucleus: A quark-model analysis.

Baryon-number-violating decay of pairs of nucleons bound together in a nucleus is studied in the nonrelativistic quark model for a class of ordinary grand unified theories including minimal SU(5). Decay modes without mesons such as pp..-->..pe/sup +/, and with pions such as pp..-->..pe/sup +/..pi../sup 0/, are considered. Both spectator and pole diagrams are included. The nonmesonic decay modes are negligible, but the effective p..-->..e/sup +/..pi../sup 0/ partial lifetime in oxygen (iron) is found to be roughly-equal25% (50%) longer than the free partial lifetime. Another possible lifetime increase related to an explanation of the European Muon Collaboration effect is discussed.