Collective excitations in the inner crust of neutron stars: Supergiant resonances

Journal Article · Fri Apr 01 04:00:00 EST 2005 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.71.042801· OSTI ID:20696041

Khan, E; Giai, Nguyen Van ^[1]; Sandulescu, N ^[1]

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1. Institut de Physique Nucleaire, Universite Paris-Sud, I N2P3-CNRS, F-91406 Orsay Cedex (France)

We investigate the nuclear collective excitations of Wigner-Seitz cells containing nuclear clusters immersed in a gas of neutrons. This baryonic nonuniform system is specific to the structure of inner crust matter of neutron stars. The collective excitations are studied in the framework of a spherical Hartree-Fock-Bogoliubov + quasiparticle random phase approximation, formulated in coordinate representation. The calculations are done for two representative Wigner-Seitz cells with baryonic density equal to 0.02 and 0.08 fm{sup -3}. It is shown that the excitations with low multipolarities are concentrated almost entirely in one strongly collective mode which exhausts a very large fraction of the energy-weighted sum rule. Since these collective modes are located at very low energies compared to the giant resonances in standard nuclei, they may affect significantly the specific heat of baryonic inner crust matter of neutron stars.

• OSTI ID: 20696041
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 4 Vol. 71; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CLUSTER MODEL
COLLECTIVE EXCITATIONS
COLLECTIVE MODEL
GIANT RESONANCE
HARTREE-FOCK METHOD
HARTREE-FOCK-BOGOLYUBOV THEORY
MULTIPOLARITY
NEUTRON STARS
NEUTRONS
NUCLEAR MATTER
NUCLEAR SPECIFIC HEAT
RANDOM PHASE APPROXIMATION
SPHERICAL CONFIGURATION
SUM RULES