L. Alvarez-Ruso, P. F. Córdoba, E. Oset
Sep 2, 1996
Abstract A semiphenomenological approach to the nucleon self-energy in nuclear matter at finite temperatures is followed. It combines elements of thermo field dynamics for the treatment of finite temperature with a model for the self-energy, which evaluates the second-order diagrams taking the needed dynamics of the NN interaction from experiment. The approach proved to be accurate at zero temperature to reproduce Im Σ and other properties of nucleons in matter. In the present case we apply it to determine Im Σ at finite temperatures. An effective NN cross section is deduced, which can be easily used in analyses of heavy-ion reactions.