A microscopic study of spin-polarized asymmetric hot nuclear matter within the static fluctuation approximation (SFA)

Abstract

In this work, the thermodynamic properties of spin-polarized asymmetric hot nuclear matter are studied within the Static Fluctuation Approximation (SFA). Specifically, the energy per unit volume, pressure, entropy per unit volume, and specific heat capacity are determined as functions of density up to 0.6 fm−3, and temperature up to 80 MeV. Also, the effects of the asymmetry and spin-polarization parameters on these quantities are explored. The main input in the formalism is the Urbana V14 nucleon–nucleon potential. It is found that these parameters have significant effects on the thermodynamic properties at high densities or low temperatures where quantum features become pronounced. As expected, the entropy results show that the system is more ordered when polarized or for large values of the asymmetry parameter. The quadratic dependence of the energy on the asymmetry and spin-polarization parameters is confirmed at different densities and temperatures. The results are compared to those obtained with different approaches, such as the lowest-order constrained variational method, the conventional variational method, and the relativistic mean-field approximation. It is found that the present results are consistent with those.