SEMF Liquid Drop Model Homework: Struggling with (ii)

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Homework Statement



See attachment.
Only struggling with (ii).

Homework Equations


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?
 

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