A) why is the following inverse b decay forbidden for a free proton? p net+v b) why is the same reaction sometimes possible if the proton is bound in a nucleus? for example, the following reaction occurs: 13 c) how much energy is released in the reaction in given in b)? take the atomic masses to be m18c) 0.000549 u 13.003355 u and m( 15n) 13.005739 u, and the electron mass to be m(e+)