Consistent nuclear model for compound and precompound reactions with conservation of angular momentum. [14. 6 MeV]

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Abstract
The exciton model of precompound reactions is modified such that it automatically reduces to the usual evaporation formula after equilibrium has been reached. The result is further modified to conserve angular momentum in a form compatible with the Hauser-Feshbach formula. Such modification allows a consistent description of intermediate excitations from which tertiary reaction cross sections can be calculated for transitions to discrete residual levels with known spins and parities. Level densities used for the compound component of reaction cross sections are derived from direct summation of the particle-hole state densities used for the precompound component. Predicted neutron, proton, and alpha-particle production cross sections and spectra from 14-MeV neutron-induced reactions are compared with experimental data. Model parameters of general validity are fixed beforehand. Two parameters are determined from calculations for /sup 56/Fe and then used with reasonable success for predicting cross sections for twelve other nuclides. 17 figures.

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