Abstract
The role of the nuclear spin-orbit coupling on the equilibrium composition and on the equation of state of the outer crust of a nonaccreting neutron star is studied by employing a series of three different nuclear mass models based on the self-consistent Hartree-Fock-Bogoliubov method.
Highlights
Born in the aftermath of gravitational core-collapse supernova explosions, neutron stars are the most compact stars in the Universe [1]
We study the role of nuclear spin-orbit coupling on the structure and on the equation of state of the outer crust of a nonaccreting neutron star using the experimental atomic mass measurements from the 2012 Atomic Mass Evaluation [13] (AME) complemented by the Brussels-Montreal Hartree-Fock-Bogoliubov (HFB) atomic mass tables HFB-24 [14], HFB-28 and HFB-29 [15]
We have determined the constitution of the outer crust of a nonaccreting neutron star by minimising the Gibbs free energy per nucleon increasing the pressure from P = 9 × 10−12 MeV fm−3 up to the onset of the neutron-drip transition at pressure P = Pdrip, with a pressure step δP = 1.003P
Summary
Born in the aftermath of gravitational core-collapse supernova explosions, neutron stars are the most compact stars in the Universe [1]. The equilibrium composition of the crust is completely determined by experimental nuclear masses up to a density of about 6 × 1010 g cm−3. At some density ρdrip ≈ 4.4 × 1011 g cm−3, neutrons “drip” out of nuclei delimiting the boundary between the outer and inner regions of the crust The outer crust composition is essential to evaluate the possible contribution of neutron stars to the galactic enrichment in the so-called r-process nuclei, whose origin remains one of the major mysteries in astrophysics We study the role of nuclear spin-orbit coupling on the structure and on the equation of state of the outer crust of a nonaccreting neutron star using the experimental atomic mass measurements from the 2012 Atomic Mass Evaluation [13] (AME) complemented by the Brussels-Montreal Hartree-Fock-Bogoliubov (HFB) atomic mass tables HFB-24 [14], HFB-28 and HFB-29 [15]
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