[ethylenediamine]

The low-lying levels of 13-N are the ground state, 1/2-; 2.37 MeV, 1/2+; 3.51 MeV, 3/2-; and 3.55 MeV, 5/2+. The next states are about 6.5 MeV and above. Interpret these four states according to the shell model.


How should I even begin this problem? Is there any general formulas which I should apply?

[FeLiXe]

all I can say is that it seems to lead to the fact that 13-N is unstable because that energy level of 6.5 MeV is populated