Abstract
The theory of a cascade neutron evaporation process is derived in detail in a form suited to the treatment of highly excited nuclei which have a continuous distribution of excitation energies following a primary direct interaction. The results are found to give good agreement with neutron spectra of nuclei following bombardment with 190 MeV protons observed by Gross. Data from medium energy neutron reactions, thermal energy neutron resonances, and heavy ion reaction experiments are compared. Formulae are derived in an appendix for the effect on the level density of a gap in the single particle level spacing at the Fermi level.
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