The semi-empirical formula for binding energy of nuclei given by Weizsacker is written below:
where
are best-fit parameters.,
- nucleon number, - neutron number, proton number.
The first term with subscript v is volume term.
The second term with subscript s is surface term.
The third term with subscript c is coulomb term.
The fourth term with subscript a is asymmetry term.
The fifth term with subscript p is pairing term - defines the effect of spin-coupling. It's positive with Z, N, A even, zero with A odd, negative with Z, N odd and A even.
Therefore, for 235U this will give
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