INCOMPRESSIBILITY OF HOT ASYMMETRICAL NUCLEAR-MATTER - LOWEST ORDER CONSTRAINED VARIATIONAL APPROACH

The isothermal and isentropic incompressibility of asymmetrical nuclea r matter are investigated in the framework of the lowest order constra ined variational method. Various phenomenological nucleon-nucleon inte ractions, namely, the Reid, the Delta-Reid, and the new Argonne potent ials are used. It is found that the temperature as well as the asymmet ry parameter reduce the incompressibility of asymmetrical nuclear matt er. The pressure is calculated along isentropic paths. It is shown tha t the equation state is much harder than the one usually assumed in th e hydrodynamical simulations of supernova collapse. Various discussion s are made in connection with the problem of supernova explosions and other many-body model calculations. [S0556-2813(98)03311-1].