Further explorations of Skyrme-Hartree-Fock-Bogoliubov mass formulas. XII. Stiffness and stability of neutron-star matter

Journal Article · Wed Sep 15 00:00:00 EDT 2010 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.82.035804· OSTI ID:21419568

Goriely, S; Chamel, N ^[1]; Pearson, J M ^[2]

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1. Institut d'Astronomie et d'Astrophysique, CP-226, Universite Libre de Bruxelles, B-1050 Brussels (Belgium)
2. Departement de Physique, Universite de Montreal, Montreal (Quebec), H3C 3J7 (Canada)

We construct three new Hartree-Fock-Bogoliubov (HFB) mass models, labeled HFB-19, HFB-20, and HFB-21, with unconventional Skyrme forces containing t{sub 4} and t{sub 5} terms, i.e., density-dependent generalizations of the usual t{sub 1} and t{sub 2} terms, respectively. The new forces underlying these models are fitted respectively to three different realistic equations of state of neutron matter for which the density dependence of the symmetry energy ranges from the very soft to the very stiff, reflecting thereby our present lack of complete knowledge of the high-density behavior of nuclear matter. All unphysical instabilities of nuclear matter, including the transition to a polarized state in neutron-star matter, are eliminated with the new forces. At the same time the new models fit essentially all the available mass data with rms deviations of 0.58 MeV and give the same high-quality fits to measured charge radii that we obtained in earlier models with conventional Skyrme forces. Being constrained by neutron matter, these new mass models, which all give similar extrapolations out to the neutron drip line, are highly appropriate for studies of the r process and the outer crust of neutron stars. Moreover, the underlying forces, labeled BSk19, BSk20 and BSk21, respectively, are well adapted to the study of the inner crust and core of neutron stars. The new family of Skyrme forces thus opens the way to a unified description of all regions of neutron stars.

• OSTI ID: 21419568
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 82, Issue 3; Other Information: DOI: 10.1103/PhysRevC.82.035804; (c) 2010 The American Physical Society; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
DENSITY
EQUATIONS OF STATE
EXTRAPOLATION
FLEXIBILITY
HARTREE-FOCK-BOGOLYUBOV THEORY
INSTABILITY
KEV RANGE 100-1000
MASS
MASS FORMULAE
NEUTRON STARS
NEUTRONS
NUCLEAR MATTER
R PROCESS
SIMULATION
SKYRME POTENTIAL
STABILITY
SYMMETRY
BARYONS
ELEMENTARY PARTICLES
ENERGY RANGE
EQUATIONS
EVOLUTION
FERMIONS
HADRONS
KEV RANGE
MATHEMATICAL SOLUTIONS
MATTER
MECHANICAL PROPERTIES
NUCLEON-NUCLEON POTENTIAL
NUCLEONS
NUMERICAL SOLUTION
PHYSICAL PROPERTIES
POTENTIALS
STAR EVOLUTION
STARS
TENSILE PROPERTIES