Effects of isospin and momentum dependent interactions on thermal properties of asymmetric nuclear matter

Abstract

Thermal properties of asymmetric nuclear matter are studied within a self-consistent thermal model using an isospin and momentum dependent interaction (MDI) constrained by the isospin diffusion data in heavy-ion collisions, a momentum-independent interaction (MID), and an isoscalar momentum-dependent interaction (eMDYI). In particular, we study the temperature dependence of the isospin-dependent bulk and single-particle properties, the mechanical and chemical instabilities, and liquid-gas phase transition in hot asymmetric nuclear matter. Our results indicate that the temperature dependence of the equation of state and the symmetry energy are not so sensitive to the momentum dependence of the interaction. The symmetry energy at fixed density is found to generally decrease with temperature and for the MDI interaction the decrement is essentially due to the potential part. It is further shown that only the low momentum part of the single-particle potential and the nucleon effective mass increases significantly with temperature for the momentum-dependent interactions. For the MDI interaction, the low momentum part of the symmetry potential is significantly reduced with increasing temperature. For the mechanical and chemical instabilities as well as the liquid-gas phase transition in hot asymmetric nuclear matter, our results indicate that the boundary of these instabilities and the phase-coexistence region generally shrink with increasing temperature and is sensitive to the density dependence of the symmetry energy and the isospin and momentum dependence of the nuclear interaction, especially at higher temperatures.

21 pages, 29 figures

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Cited by in corpus (19)

• Locating the inner edge of neutron star crust using terrestrial nuclear laboratory data
• Progress of Quantum Molecular Dynamics model and its applications in Heavy Ion Collisions
• Thermal properties of asymmetric nuclear matter with an improved isospin- and momentum-dependent interaction
• Probing the symmetry energy from the nuclear isoscaling
• Cluster formation in asymmetric nuclear matter: semi-classical and quantal approaches
• Temperature dependence of the symmetry energy and neutron skins in Ni, Sn, and Pb isotopic chains
• Temperature and momentum dependence of single-particle properties in hot asymmetric nuclear matter
• Neutron-proton effective mass splitting in neutron-rich matter and its impacts on nuclear reactions
• Hyperon star in a modified quark meson coupling model
• Density matrix expansion for the MDI interaction
• Dynamical instabilities of warm $np{e}^{-}$ matter: the $\delta$ meson effects
• Transition density and pressure in hot neutron stars
• Nuclear Chemical and Mechanical Instability and the Liquid-Gas Phase Transition in Nuclei
• Disentangling effects of collision geometry and symmetry energy in U+U collisions
• Isospin effect on quark matter instabilities
• Elimination of influence of neutron-skin size difference of initial colliding nuclei in Pb+Pb collisions
• Shear viscosity of nuclear matter in the spinodal region
• Isospin and momentum dependence of liquid-gas phase transition in hot asymmetric nuclear matter
• Transport properties of asymmetric nuclear matter in the spinodal region