Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-01-15
Nucl.Phys. A676 (2000) 455-473; Erratum-ibid. A726 (2003) 357-365
Astronomy and Astrophysics
Astrophysics
37 pages and 10 postscript figures. Nuclear Physics A (accepted)
Scientific paper
10.1016/S0375-9474(00)00197-4
Equilibrium phase diagrams for neutron star matter at subnuclear densities are obtained at zero temperature. Spherical, rod-like and slab-like nuclei as well as spherical and rod-like nuclear bubbles are taken into account by using a compressible liquid-drop model. This model is designed to incorporate uncertainties in the nuclear surface tension and in the proton chemical potential in a gas of dripped neutrons. The resultant phase diagrams show that for typical values of these quantities, the phases with rod-like nuclei and with slab-like nuclei occur in the form of Coulomb lattice at densities below a point where the system becomes uniform. Thermal fluctuations leading to displacements of such nuclei from their equilibrium positions are considered through explicit evaluations of their elastic constants; these fluctuations can be effective at destroying the layered lattice of slab-like nuclei in the temperature region typical of matter in the neutron star crust.
Iida Kei
Sato Katsuhiko
Watanabe Gentaro
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