EXPERIMENTAL TEST OF STATISTICAL-MODEL APPROXIMATIONS WHEN GAMMA/D GREATER THAN 1

Cross sections have been measured for the reaction Al27(p,α)Mg24 to the ground and first six excited states of the residual nucleus at seven angles and in 30-keV steps over the proton laboratory energy region of 8-10 MeV. Average cross sections were calculated using formulas dependent on Hauser-Feshbach-model assumptions. Correlation functions for the statistical fluctuation of cross sections with energy were examined. The Hauser-Feshbach model and the Ericson fluctuation theory have been found to be adequate to describe the average cross sections and cross-section fluctuations for both open and partially open exit channels. © 1969 The American Physical Society.