1. The problem statement, all variables and given/known data when fission occurs why neutron get less energy as compare to the daughter nuclei? i need both physical and mathematical explanation. 2. Relevant equations 3. The attempt at a solution i think it is due to the small mass of neutron. but i am not sure as it is not satisfactory. a neutron may get very high speed to get a significant share of the released energy. but why few MeV?