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arXiv 0909.5494nucl-thastro-ph.SRnucl-ex
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中子星壳内缘的核约束

Nuclear constraints on the inner edge of neutron star crusts

Lie-Wen Chen, Bao-An Li, Hong-Ru Ma, Jun Xu

摘要:

我们发现,广泛使用的抛物线近似的状态方程(EOS)的非对称核物质导致系统显着更高的核壳转换密度和压力。利用与中子星壳相同的亚饱和密度范围内重离子反应的同位旋扩散数据约束的丰中子核物质状态方程,确定了中子星液态核与固态壳分离的内缘处的密度和压力分别为0.040 fm $^{-3}$ $\leq ρ_{t}\leq 0.065$ fm $^{-3}$和0.01 MeV/fm $^{3}$ $\leq P_{t}\leq 0.26$ MeV/fm $^{3}$.船帆座脉冲星上的这些约束的影响进行了讨论。

英文摘要:

We show that the widely used parabolic approximation to the Equation of State (EOS) of asymmetric nuclear matter leads systematically to significantly higher core-crust transition densities and pressures. Using an EOS for neutron-rich nuclear matter constrained by the isospin diffusion data from heavy-ion reactions in the same sub-saturation density range as the neutron star crust, the density and pressure at the inner edge separating the liquid core from the solid crust of neutron stars are determined to be 0.040 fm$^{-3}$ $\leq ρ_{t}\leq 0.065$ fm$^{-3}$ and 0.01 MeV/fm$^{3}$ $\leq P_{t}\leq 0.26$ MeV/fm$^{3}$, respectively. Implications of these constraints on the Vela pulsar are discussed.

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