Heavy ion precompound phenomena

The authors test a relaxation model based on two body nucleon-nucleon scattering processes to interpret phenomena observed in heavy ion reactions. They use the Boltzmann master equation to accomplish this. By assuming that the projectile nucleons share the total excitation with equal a-priori probability of all configurations, we are able to reproduce several sets of neutron spectra from 20Ne and 12C induced reactions on 165Ho. With no additional free parameters our model successfully reproduces subthreshold pion production cross sections, high energy γ-ray spectra, and angular distributions of high energy γ-rays