A new method is proposed to determine the energy-dependent spin distribution in experimental nuclear-level schemes. This method compares various experimental and calculated moments in the energy-spin plane to obtain the spin-cutoff parameter σ as a function of mass A and excitation energy using a total of $7202$ levels with spin assignment in $227$ nuclei between F and Cf. A simple formula, σ²=0.391 A0.675(E-0.5Pa')0.312, is proposed up to about 10 MeV that is in very good agreement with experimental σ values and is applied to improve the systematics of level-density parameters.
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Egidy et al. (2009) studied this question.
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