skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Effects of energy conservation on equilibrium properties of hot asymmetric nuclear matter

Authors:
;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1417690
Grant/Contract Number:
SC0015266
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 97; Journal Issue: 1; Related Information: CHORUS Timestamp: 2018-01-22 10:14:02; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English

Citation Formats

Zhang, Zhen, and Ko, Che Ming. Effects of energy conservation on equilibrium properties of hot asymmetric nuclear matter. United States: N. p., 2018. Web. doi:10.1103/PhysRevC.97.014610.
Zhang, Zhen, & Ko, Che Ming. Effects of energy conservation on equilibrium properties of hot asymmetric nuclear matter. United States. doi:10.1103/PhysRevC.97.014610.
Zhang, Zhen, and Ko, Che Ming. 2018. "Effects of energy conservation on equilibrium properties of hot asymmetric nuclear matter". United States. doi:10.1103/PhysRevC.97.014610.
@article{osti_1417690,
title = {Effects of energy conservation on equilibrium properties of hot asymmetric nuclear matter},
author = {Zhang, Zhen and Ko, Che Ming},
abstractNote = {},
doi = {10.1103/PhysRevC.97.014610},
journal = {Physical Review C},
number = 1,
volume = 97,
place = {United States},
year = 2018,
month = 1
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on January 22, 2019
Publisher's Accepted Manuscript

Save / Share:
  • The liquid-gas phase transition in hot asymmetric nuclear matter is investigated within the relativistic mean-field model using the density dependence of nuclear symmetry energy constrained from the measured neutron skin thickness of finite nuclei. We find symmetry energy has a significant influence on several features of liquid-gas phase transition: the boundary and area of the liquid-gas coexistence region, the maximal isospin asymmetry, and the critical values of pressure and isospin asymmetry, all of which systematically increase with increasing softness in the density dependence of symmetry energy. The critical temperature below which the liquid-gas mixed phase exists is found higher formore » a softer symmetry energy.« less
  • 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 densitymore » 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 boundaries of these instabilities and the phase-coexistence region generally shrink with increasing temperature and are sensitive to the density dependence of the symmetry energy and the isospin and momentum dependence of the nuclear interaction, especially at higher temperatures.« less
  • Using the relativistic impulse approximation with empirical NN scattering amplitude and the nuclear scalar and vector densities from the relativistic mean-field theory, we evaluate the Dirac optical potential for neutrons and protons in asymmetric nuclear matter. From the resulting Schroedinger-equivalent potential, the high-energy behavior of the nuclear symmetry potential is studied. We find that the symmetry potential at fixed baryon density is essentially constant once the nucleon kinetic energy is greater than about 500 MeV. Moreover, for such a high-energy nucleon, the symmetry potential is slightly negative below a baryon density of about {rho}=0.22 fm{sup -3} and then increases almostmore » linearly to positive values at high densities. Our results thus provide an important constraint on the energy and density dependence of nuclear symmetry potential in asymmetric nuclear matter.« less
  • We calculate properties of neutron stars such as mass and radius using a relativistic Dirac-Brueckner-Hartree-Fock approach. Modern meson-exchange potential models are used to evaluate the [ital G] matrix for asymmetric nuclear matter. For pure neutron matter we find the maximum mass to be [ital M][sub max][approx]2.4[ital M][sub [circle dot]] for a radius [ital R][approx]12 km, whereas with a proton fraction of 30% we find [ital M][sub max][approx]2.1[ital M][sub [circle dot]] for a radius [ital R][approx]10.5 km, close to the experimental values. The implications are discussed.
  • Cited by 13