冷的非吸积中子星外壳中的二元和三元离子化合物
Binary and ternary ionic compounds in the outer crust of a cold nonaccreting neutron star
摘要：
一般认为冷的非吸积中子星的外壳分为不同的层，每一层都由一个纯的体心立方离子晶体组成，背景是高度简并的电子的电荷补偿。通过分析致密恒星物质中多元离子化合物的稳定性来检验这一假设的有效性。因此，它表明，他们的稳定性对相分离是唯一的决定，他们的结构和他们的组成，无论恒星的条件。然而，弱核和强核过程的平衡对多元化合物的组成以及它们的形成施加了非常严格的限制。通过研究不同的立方晶格和非立方晶格，发现具有与氯化铯相同结构的取代化合物最有可能存在于非吸积中子星的外壳中。三元化合物的存在也进行了研究。非常准确的解析表达式得到的阈值压力，以及不同阶段的密度，而不管电子气的相对性程度。最后，数值计算的基态结构和状态方程的外壳的冷非吸积中子星进行使用最近的实验和微观核质量表。
英文摘要：
The outer crust of a cold nonaccreting neutron star has been generally assumed to be stratified into different layers, each of which consists of a pure body-centered cubic ionic crystal in a charge compensating background of highly degenerate electrons. The validity of this assumption is examined by analyzing the stability of multinary ionic compounds in dense stellar matter. It is thus shown that their stability against phase separation is uniquely determined by their structure and their composition irrespective of the stellar conditions. However, equilibrium with respect to weak and strong nuclear processes imposes very stringent constraints on the composition of multinary compounds, and thereby on their formation. By examining different cubic and noncubic lattices, it is found that substitutional compounds having the same structure as cesium chloride are the most likely to exist in the outer crust of a nonaccreting neutron star. The presence of ternary compounds is also investigated. Very accurate analytical expressions are obtained for the threshold pressure, as well as for the densities of the different phases irrespective of the degree of relativity of the electron gas. Finally, numerical calculations of the ground-state structure and of the equation of state of the outer crust of a cold nonaccreting neutron star are carried out using recent experimental and microscopic nuclear mass tables.
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