e nucleus (you know what in the nucleus) must have minimum energy x, if e shell has energy, resultant of en + es <x, e resultant (standard model electron) does not violate probability, regardless of state.
Will work on wave function, I can almost see it relating well, it will need to come into focus
P.S. I was quite wrong about the neutron decay in tritium, it seems that electron would exchange energy via dipole interaction to form the stable hydrogen3, but I am getting ahead of myself, that is all guess work.