Further explorations of Skyrme-Hartree-Fock-Bogoliubov mass formulas. XI. Stabilizing neutron stars against a ferromagnetic collapse

Journal Article · Tue Dec 15 04:00:00 EST 2009 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.80.065804· OSTI ID:21296636

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

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1. Institut d'Astronomie et d'Astrophysique, CP226, Universite Libre de Bruxelles, B-1050 Brussels (Belgium)
2. Departement de Physique, Universite de Montreal, Montreal, Quebec H3C 3J7 (Canada)

We construct a new Hartree-Fock-Bogoliubov (HFB) mass model, labeled HFB-18, with a generalized Skyrme force. The additional terms that we have introduced into the force are density-dependent generalizations of the usual t{sub 1} and t{sub 2} terms and are chosen in such a way as to avoid the high-density ferromagnetic instability of neutron stars that is a general feature of conventional Skyrme forces, and in particular of the Skyrme forces underlying all the HFB mass models that we have developed in the past. The remaining parameters of the model are then fitted to essentially all the available mass data, an rms deviation {sigma} of 0.585 MeV being obtained. The new model thus gives almost as good a mass fit as our best-fit model HFB-17 ({sigma}=0.581 MeV) and has the advantage of avoiding the ferromagnetic collapse of neutron stars.

• OSTI ID: 21296636
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 6 Vol. 80; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
EXPLORATION
HARTREE-FOCK-BOGOLYUBOV THEORY
INSTABILITY
KEV RANGE 100-1000
MASS
MASS FORMULAE
NEUTRON STARS
SKYRME POTENTIAL