The Hot and Cold Properties of Nuclear Matter (original) (raw)
The properties of nuclear matter at zero and finite temperatures in the frame of the Brueckner theory realistic nucleon-nucleon potentials are studied. Comparison with other calculations is made. In addition we present results for the symmetry energy obtained with different potentials, which is of great importance in astrophysical calculat ion. Properties of asymmetric nuclear matter are derived fro m various many-body approaches. This includes phenomenological ones like the Skyrme Hartree-Fock and relat ivistic mean field approaches, which are adjusted to fit properties of nuclei, as well as mo re microscopic attempts like the BHF appro ximation, a Self-Consistent Greens Function (SCGF) method and the so-called V lowk approach, which are based on realistic nucleon-nucleon interactions which reproduce the nucleon-nucleon phase shifts. These microscopic approaches are supplemented by a density-dependent contact interaction to achieve the empirical saturation property of symmet ric nuclear matter. Special attention is paid to behavior o f the isovector and the isoscalar co mponent of the effective mass in neutron-rich matter. The nuclear sy mmetry potential at fixed nuclear density is also calculated and its value decreases with increasing the nucleon energy. In particu lar, the nuclear symmet ry potential at saturation density changes fro m positive to negative values at nucleon kinetic energy of about 200 MeV. The hot properties of nuclear matter are also calculated using T 2 -approximation method at low temperatures. Good agreement is obtained in comparison with previous theoretical estimates and experimental data especially at low densities.
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