Abstract
The suggestions put forward by Bethe and Hurwitz that level densities ought to be measured from a standard energy, such as is given by the semi-empirical formula, and not from nuclear ground states is considered. The semi-empirical formula is corrected, following P. Fong, and this “characteristic level” is determined for nuclei from A = 10 to A = 250. The experimental data of D. Hughes et al. for the fast neutron cross sections are used to determine the level densities for the corresponding nuclei. These were found to be in agreement with the Fermi-gas model.
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