磁星外壳层核素的电子俘获的研究  

A Research of Electron Capture for Nuclei in the Outer Crust of Magnetars

作　　者：曹彪[1] 杜军[1] 

机构地区：[1]西华师范大学物理与电子信息学院,南充637009

出　　处：《天文学报》2014年第4期273-278,共6页Acta Astronomica Sinica

基　　金：国家自然科学基金项目(U1331121;11273020)资助

摘　　要：利用朗道能级量子化近似和核壳层模型,研究了超强磁场对^(53,54,55)Fe的电子俘获的影响.结果表明在超强磁场下的电子俘获率比在弱场近似下的电子俘获率增加了约2个数量级.在弱场近似和磁场为B=4.414×10^(15)Gs条件下计算了每个核素的电子丰度变化率和总的电子丰度变化率,它们一般相差3个量级以上.这些结论对将来的磁星演化的研究起到重要的作用.In this paper,by employing the approximation of Landau level quantization and the nuclear shell model,we investigate the effects of ultra-strong magnetic fields on the electron capture （EC） rates for 53,54,55Fe.Our results indicate that the EC rates increase about 2 orders of magnitude in the ultra-strong magnetic fields compared with those in the weak-field limit.The rate of change of the electron fraction,Ye,for every nuclide and total Ye in the condition of the weak-field approximation and B =4.414 × 10^15 Gs have been calculated,respectively.Their differences exceed about 3 orders of magnitude generally.These conclusions play an important role in the future study of the evolution of magnetar.

关 键 词：恒星 磁星 恒星 演化 恒星 磁场 恒星 内部 方法 数值 

分 类 号：P145[天文地球—天体物理]