Reference

In the[1], we know, unstable atomic nuclei with an excess of protons may under go β+ decay, also called positron decay, where a proton is converted into a neutron, a positr-on and an electron-type neutrino: a Proton ( P) → a Neutron ( N) + an Electron ( E) + a Neutrino ( Ne) ( i) Beta plus decay can only happen inside nuclei when the absolute value of the binding energy of the daughter nucleus is greater than that of the mother nucleus, i.e., the dau-ghter nucleus is a lower-energy state [1]. By the Law of conservation of mass and ( i), we have MP ≥ MN + ME + MNe Then there be MP>MN