Inclusive proton decay in a nucleus

The conversion of a proton inside a nucleus into a positron, the rest of the nucleus absorbing only the required energy momentum is considered. For 16O it is found that the lifetime of a proton due to this mechanism is of the same order (probably approx.3 times smaller) as that due to the conventional two-quark fusion. The experimental signature is different, a positron track against a star of nuclear fragments, with eventual pions