Atomic input for modeling ionic mixtures in astrophysical plasma

IF 2.6 3区 物理与天体物理 Q2 PHYSICS, NUCLEAR
S. Fritzsche
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Abstract

Accurate atomic data are known as a key ingredient for modeling the physical behavior of a wide range of plasma throughout the universe. When these data are combined with simulations of ionic mixtures, they (may) help infer the temperature, electron density, and ionization state of the plasma under non-ideal plasma conditions. We here report about an expansion of JAC, the Jena Atomic Calculator, in order to encourage the modeling of ionic mixtures and their thermodynamic properties under different plasma conditions. Whereas emphasis has first been placed upon simulations of ionic compositions in (ideal) local thermodynamic equilibrium, various features are prepared in this code to account for non-ideal conditions, such as plasma screening contributions, the ionization potential depression (IPD) or some non-classical statistics. To demonstrate these features of JAC, we have calculated the mean charge and charge-state distribution of a hot carbon plasma as well as some ionic mixture from the sun’s photosphere at selected temperatures T and mass densities \(\rho _m\). These computations show a significant shift in the mean charge distribution, if the IPD is incorporated by means of a Stewart–Pyatt plasma model. Since the JAC toolbox is based on Dirac’s relativistic equation, the present expansion of the code will facilitate also the treatment of ionic mixtures with medium and heavy elements as relevant for neutron-star mergers and elsewhere.

天体物理等离子体中模拟离子混合物的原子输入
精确的原子数据被认为是模拟宇宙中各种等离子体物理行为的关键因素。当这些数据与离子混合物的模拟相结合时,它们(可能)有助于推断非理想等离子体条件下等离子体的温度、电子密度和电离状态。我们在这里报告了JAC的扩展,耶拿原子计算器,为了鼓励离子混合物的建模及其在不同等离子体条件下的热力学性质。虽然重点首先放在(理想)局部热力学平衡中的离子组成的模拟上,但在本代码中准备了各种特征来解释非理想条件,例如等离子体筛选贡献,电离电位下降(IPD)或一些非经典统计。为了证明JAC的这些特征,我们计算了热碳等离子体以及来自太阳光球的一些离子混合物在选定温度T和质量密度\(\rho _m\)下的平均电荷和电荷态分布。这些计算表明,如果通过斯图尔特-皮亚特等离子体模型将IPD合并,则平均电荷分布会发生重大变化。由于JAC工具箱是基于狄拉克的相对论方程,目前对代码的扩展也将有助于处理与中子星合并和其他地方相关的中重元素离子混合物。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
The European Physical Journal A
The European Physical Journal A 物理-物理:核物理
CiteScore
5.00
自引率
18.50%
发文量
216
审稿时长
3-8 weeks
期刊介绍: Hadron Physics Hadron Structure Hadron Spectroscopy Hadronic and Electroweak Interactions of Hadrons Nonperturbative Approaches to QCD Phenomenological Approaches to Hadron Physics Nuclear and Quark Matter Heavy-Ion Collisions Phase Diagram of the Strong Interaction Hard Probes Quark-Gluon Plasma and Hadronic Matter Relativistic Transport and Hydrodynamics Compact Stars Nuclear Physics Nuclear Structure and Reactions Few-Body Systems Radioactive Beams Electroweak Interactions Nuclear Astrophysics Article Categories Letters (Open Access) Regular Articles New Tools and Techniques Reviews.
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