Answer to Question #120856 in Physics for kashaf

Question

Use lepton number conservation to determine the identitiy of particle A in the following electron capturing process ?
e+p→n+A

Answer 1

The lepton number for e is 1, for p and n is 0. Thus, in order to conserve the lepton number in this reaction, the lepton number of particle A should be equal to 1. Thus, the particle A should be an  electron neutrino.