论文标题
Skyrme-hartree-fock的核特性计算中子恒星外壳的滴点区域
Skyrme-Hartree-Fock calculations of nuclear properties in the drip-point region of neutron star crust
论文作者
论文摘要
在本文中，我们探讨了冷非旋转隔离中子星的中子滴落区域。我们已经对嵌入电子气体中的核进行了扩展的核结构计算。为了对外壳进行建模，我们使用一组Wigner-Seitz细胞，每个细胞都包含一个被相对论电子云包围的核。在滴水点上方，非相关性中子气体发生在细胞中。这些计算是在Hartree-Fock方法中与Skyrme有效相互作用结合使用的。对于每个重子密度，我们都以最小的总能量确定了构型。已经确定了大约240个不同参数的滴滴元素和相应的滴水密度，用于文献中使用的天际力。我们证明了计算出的滴点密度基本上取决于使用的Skyrme参数化。甚至在不同的参数化方面，滴水区域的滴元素和被占用的壳也有所不同。我们发现，在滴水点建立中子气的中子数量也取决于选择的天空力。然而，滴水区中中子气的数量密度或多或少是相同的（$ \ sim 10^{ - 5} \ frac {neutrons} {{fm}^{3}}} $）。在我们的方法中获得的滴水密度通常低于前面的预测。
In the present paper we explore the neutron-drip region of cold non-rotating isolated neutron stars. We have performed extended nuclear-structure calculations for nuclei embedded in the electron gas. For modeling the outer crust we use a set of Wigner-Seitz cells, where every cell contains one nucleus surrounded by a cloud of relativistic electrons. Above the drip point a non-relativistic neutron gas occurs in the cell. These calculations are carried out within the Hartree-Fock approach in combination with Skyrme effective interactions. For every baryon density we have determined the configuration with a minimal total energy. The drip elements and corresponding drip densities have been determined for about 240 different parametrizations of Skyrme forces used in the literature. We demonstrate that the calculated drip-point densities depend essentially on the Skyrme parametrization used. Even the drip elements and the occupied shells in the drip region differ for different parametrizations. We have found that the number of neutrons building the neutron gas at the drip point also depends essentially on the Skyrme force chosen. Nevertheless, the number density of the neutron gas in the drip-region is more or less the same ($\sim 10^{-5} \frac{neutrons}{{fm}^{3}}$). The drip densities obtained within our approach are generally lower than predicted earlier.
