A fast parallel code for calculating energies and oscillator strengths of many-electron atoms at neutron star magnetic field strengths in adiabatic approximation

Name: A fast parallel code for calculating energies and oscillator strengths of many-electron atoms at neutron star magnetic field strengths in adiabatic approximation
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doi.org2025-03-24 收录

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Abstract We have developed a new method for the fast computation of wavelengths and oscillator strengths for medium-Z atoms and ions, up to iron, at neutron star magnetic field strengths. The method is a parallelized Hartree-Fock approach in adiabatic approximation based on finite-element and B-spline techniques. It turns out that typically 15-20 finite elements are sufficient to calculate energies to within a relative accuracy of 10^(-5)in 4 or 5 iteration steps using B-splines of 6th order, with ... Title of program: HFFEM Catalogue Id: AECC_v1_0 Nature of problem Calculations of synthetic spectra [1] of strongly magnetized neutron stars are bedevilled by the lack of data for atoms in intense magnetic fields. While the behaviour of hydrogen and helium has been investigated in detail (see, e.g., [2]), complete and reliable data for heavier elements, in particular iron, are still missing. Since neutron stars are formed by the collapse of the iron cores of massive stars, it may be assumed that their atmospheres contain an iron plasma. Our objective is to fil ... Versions of this program held in the CPC repository in Mendeley Data AECC_v1_0; HFFEM; 10.1016/j.cpc.2008.09.008 AECC_v2_0; HFFERII; 10.1016/j.cpc.2012.02.011 AECC_v2_1; HFFERII; 10.1016/j.cpc.2014.02.007 This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2019)

摘要本团队研发了一种针对中Z原子及离子（至铁为止）在脉冲星磁场强度下的快速波长和振子强度计算的新方法。该方法基于有限元素和B样条技术，采用绝热近似下的并行化Hartree-Fock方法。结果表明，使用6阶B样条，通常仅需15-20个有限元素，即可在4或5次迭代步骤内计算出能量，相对精度可达10^(-5)。程序名称：HFFEM 目录编号：AECC_v1_0 问题性质强磁场脉冲星的合成光谱[1]计算因缺乏强磁场中原子数据而面临困难。尽管氢和氦的行为已得到详细研究（参见，例如[2]），但重元素（特别是铁）的完整可靠数据仍然匮乏。由于脉冲星是由质量大星体的铁核坍缩形成，因此可以假设其大气中包含铁等离子体。我们的目标是... Mendeley数据中CPC仓库中保存的该程序版本 AECC_v1_0; HFFEM; 10.1016/j.cpc.2008.09.008 AECC_v2_0; HFFERII; 10.1016/j.cpc.2012.02.011 AECC_v2_1; HFFERII; 10.1016/j.cpc.2014.02.007 本程序已从贝尔法斯特女王大学（1969-2019）的CPC程序库导入。

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