Bethe level-density back-shifted Fermi-gas model: S(E) = 2 sqrt(aE); nuclear temperature T = sqrt(E/a)

Bethe back-shifted Fermi-gas level-density framework (Bethe 1936 Phys Rev 50, 332). Setup: for an excited compound nucleus at excitation energy E, the density of many-body nuclear levels is asymptotically rho(E) ~ (pi/12) (1/(a^(1/4)…