I have a question about symmetry energy in semi-empirical mass formula,(adsbygoogle = window.adsbygoogle || []).push({});

According to semi-empirical mass formula as follows:

E=a_{v}A-a_{s}A^{2/3}-a_{c}Z(Z-1)/A^{1/3}-a_{sym}(N-Z)^{2}/A

why in the symmetry energy only squared parameter symmetry are exist and there is not the first power of asymmetry parameter?

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# Symmetry energy in nuclear physics

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