The concept is best illustrated for 14 MeV neutrons, viz. figure-1. The left hand peak spans a neutron/proton diameter . If a peak neutron (left hand line figure-1) meets a sink proton (right hand red line figure-reffig1) the states of the neutron and proton do not match and there is little overlap in their respective (45). expressions. Returning to 2.45 MeV we take this as "energy loss" in the neutron proton fusion process. If we accept losses like e.g. overlap and Heisenberg uncertainty (based on the minimum when the proton source is hydrogen molecule) we find via