Contribution of Direct and Statistical Reaction Mechanisms During Fast Neutron Scattering at Low-Lying Levels of Light and Medium Nuclei

摘要

The authors analyse the basic characteristics of the behaviour of the neutron excitation functions for low-lying levels of nuclei and discuss the interrelationship between these characteristics and the parameters of the optical and statistical models used for their description. They consider the differences in the parameters of the dynamic deformation of nuclei which occur in the direct inelastic nucleon scattering reactions and during Coulomb excitation of low-lying collective levels. It is shown that direct transitions make a substantial contribution to the excitation functions for discrete levels even at comparatively low neutron energies. The authors have investigated the role played by the structural changes of the neutron strength functions in the interpretation of the observed energy dependence of the inelastic scattering cross-sections in the near-threshold region. (Atomindex citation 15:043162)