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d) Using the SEMF show that the neutron separation energy S, is given approximately by
1-2A + 4Z
A
2as
3A¹/3
ac Z²
+
3 A4/3
Snav
You may use the approximations Z(Z − 1) ≈ Z², A(A − 1) ≈ A² and (A − 1)" ≈ An — nA¹-1,
and ignore the pairing term.
+ as

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