1. The problem statement, all variables and given/known data See attachment. Only struggling with (ii). 2. Relevant equations 3. The attempt at a solution So ultimately after doing everything, calculating B(ε)-B(0) & assuming z>>1 and z2/A > 47 I find that B(ε)-B(0) > 0.048ε2A2/3 I don't really see how this tells me if the nuclei will spontaneously fission or not, I still haven't used the assumption R is proportional to A1/3 though. Any help please?