2004/11/15 by E. Khan, N. Sandulescu, Nguyen Van Giai
Earth and Planetary Sciences · Physics and Astronomy · #Astrophysics #Atomic physics #Baryon #Condensed matter physics #Crust #Geophysics #High-pressure geophysics and materials #Neutron #Neutron star #Nuclear density #Nuclear matter #Nuclear physics #Nuclear physics research studies #Nucleon #Physics #Pulsars and Gravitational Waves Research #Quasiparticle #astro-ph #nucl-th
paper · pdf · doi:10.1103/physrevc.71.042801
published as Phys.Rev. C71 (2005) 042801 · 6 pages, 4 figures
arxiv created 2004/11/15 · openalex publication_date 2005/04/14 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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^\ensuremath-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.