TEMPERATURE AND ASYMMETRY DEPENDENCE OF NUCLEAR INCOMPRESSIBILITY ANDSUPERNOVA EXPLOSIONS

The properties of hot asymmetric nuclear matter are investigated in th e framework of an extended Brueckner-Bethe-Goldstone theory, using the Paris nucleon-nucleon interaction. In particular, the asymmetry and t emperature dependence of the incompressibility of nuclear matter are e xplored in connection with the models of type-II supernova explosions. The present calculations predict a strong decrease of the nuclear inc ompressibility coming from both the temperature and the asymmetry depe ndence. The nuclear equation of state (EOS) is calculated along an ise ntrope, and compared with the phenomenological nuclear EOS which has b een commonly used in some hydrodynamical calculations of type-II super nova explosions.