Thermal properties of asymmetric nuclear matter with an improved isospin- and momentum-dependent interaction

Abstract

Thermal properties of asymmetric nuclear matter, including the temperature dependence of the symmetry energy, single-particle properties, and differential isospin fractionation, are investigated with different neutron-proton effective mass splittings using an improved isospin- and momentum-dependent interaction. In this improved interaction, the momentum-dependence of the isoscalar single-particle potential at saturation density is well fitted to that extracted from optical model analyses of proton-nucleus scattering data up to nucleon kinetic energy of 1 GeV, and the isovector properties, i.e., the slope of the nuclear symmetry energy, the momentum-dependence of the symmetry potential, and the symmetry energy at saturation density can be flexibly adjusted via three parameters $x$, $y$, and $z$, respectively. Our results indicate that the nucleon phase-space distribution in equilibrium, the temperature dependence of the symmetry energy, and the differential isospin fractionation can be significantly affected by the isospin splitting of nucleon effective mass.

10 figures, 8 pages, minor modifications, version accepted by PRC

References in corpus (8)

• Nuclear symmetry energy and its density slope at normal density extracted from global nucleon optical potentials
• Locating the inner edge of neutron star crust using terrestrial nuclear laboratory data
• Temperature effects on the nuclear symmetry energy and symmetry free energy with an isospin and momentum dependent interaction
• Effects of isospin and momentum dependent interactions on thermal properties of asymmetric nuclear matter
• Effects of isospin and momentum dependent interactions on liquid-gas phase transition in hot asymmetric nuclear matter
• Density matrix expansion for the MDI interaction
• Differential isospin-fractionation in dilute asymmetric nuclear matter
• Transition density and pressure in hot neutron stars

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