Parametrization of Energy-Averaged and Fine-Energy-Resolution Cross Sections for theCa40(α, α0)Ca40Reaction 5.5 to 17.5 MeV

The description of energy-averaged angular distributions for the ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}(\alpha , {\alpha }_0){}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}$ reaction from 5.5 to 17.5 MeV as the incoherent sum of an $l$-dependent-absorption optical-model cross section and a Hauser-Feshbach compound-elastic-scattering cross section is discussed. The parameters for both cross sections are determined throughout the energy range. Statistical-model calculations of the Hauser-Feshbach parameters $\rho$ and $\sigma$ are in good agreement with those extracted from the data. The compound-elastic-scattering cross sections obtained by analyzing the energy-averaged angular distributions are compared with those obtained in an Ericson fluctuation analysis of the fine-resolution excitation curves.