Density dependence of the nuclear symmetry energy: A microscopic perspective

Journal Article · Thu Oct 15 00:00:00 EDT 2009 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.80.045806· OSTI ID:21293994

Vidana, Isaac; Providencia, Constanca; Polls, Artur; Rios, Arnau ^[1]

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1. Centro de Fisica Computacional, Department of Physics, University of Coimbra, PT-3004-516 Coimbra (Portugal)

We perform a systematic analysis of the density dependence of nuclear symmetry energy within the microscopic Brueckner-Hartree-Fock (BHF) approach using the realistic Argonne V18 nucleon-nucleon potential plus a phenomenological three-body force of Urbana type. Our results are compared thoroughly with those arising from several Skyrme and relativistic effective models. The values of the parameters characterizing the BHF equation of state of isospin asymmetric nuclear matter fall within the trends predicted by those models and are compatible with recent constraints coming from heavy ion collisions, giant monopole resonances, or isobaric analog states. In particular we find a value of the slope parameter L=66.5 MeV, compatible with recent experimental constraints from isospin diffusion, L=88{+-}25 MeV. The correlation between the neutron skin thickness of neutron-rich isotopes and the slope L and curvature K{sub sym} parameters of the symmetry energy is studied. Our BHF results are in very good agreement with the correlations already predicted by other authors using nonrelativistic and relativistic effective models. The correlations of these two parameters and the neutron skin thickness with the transition density from nonuniform to {beta}-stable matter in neutron stars are also analyzed. Our results confirm that there is an inverse correlation between the neutron skin thickness and the transition density.

• OSTI ID: 21293994
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 80, Issue 4; Other Information: DOI: 10.1103/PhysRevC.80.045806; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ASYMMETRY
CORRELATIONS
DIFFUSION
EQUATIONS OF STATE
HARTREE-FOCK METHOD
HEAVY ION REACTIONS
ISOBARIC ANALOGS
ISOSPIN
MEV RANGE 10-100
MONOPOLES
NEUTRON STARS
NEUTRON-RICH ISOTOPES
NEUTRONS
NUCLEAR MATTER
RELATIVISTIC RANGE
RESONANCE
SKYRME POTENTIAL
SYMMETRY
THICKNESS
THREE-BODY PROBLEM