Abstract
A simple method is proposed for the calculation of particle-hole state densities containing the main effects of shell structure. The method consists of introducing a shell gap into a set of equally spaced single-particle states. State densities can then be calculated using the simple equi-spacing model formulae but with the Pauli energy and effective values of the single-particle and single-hole state densities evaluated for the set of shell-shifted single-particle states. Quite reasonable agreement is obtained with the results of more realistic and detailed numerical calculations, and the present shell-corrected state densities seem to be suitable for inclusion in pre-equilibrium reaction model calculations.
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