RPA susceptibility of asymmetric nuclear matter at finite temperatures with Skyrme interactions

Abstract We investigate the thermal RPA response of asymmetric nuclear matter interacting through various Skyrme interactions characterized by the value of the effective nucleon mass. Our study concentrates on the evolution of collective states according to the variations of the transferred momentum, temperature and asymmetry ratio. The differences and similarities between the roles of neutron excess and of thermal excitation are discussed. It is shown that the limit of meaningful nuclear asymmetries, namely Y close to 1/3, must be reached in order to observe sizable effects in the structure patterns, a fact that brings support to calculations of dynamical response that resort to symmetric …