Screening effect on electron capture in presupernova stars
Screening effect on electron capture in presupernova stars
复制标题
超新星前恒星电子俘获的屏蔽效应
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
Z. Luo
中科院分区：
文献类型：
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作者：
M. Liu;J. Zhang;Z. Luo
目标。利用改进的GT共振分布得到的新的电子俘获结果，分析了电子屏蔽效应对超新星前阶段电子俘获的影响。方法.采用由线性响应理论导出的相对论简并电子液体屏蔽势。电子捕获率的计算基于壳模型。同时考虑了屏蔽过程中电子能量的变化和电子俘获阈值的变化。结果结果表明，在高密度物质中，电子屏蔽对电子俘获的影响是显著的。当ρYe > 10 9 g/cm 3时，考虑到电子俘获率的提高，屏蔽效应对电子俘获率的影响提高了约1%.结论.在ρYe = 10 9 g/cm 3时，屏蔽对56 Co电子俘获反应的影响约为10%.屏蔽可能会影响前超新星的结构和演化，应该包括在任何精确的模拟中。
Aims. With the new electron capture results from the improved GT resonance distribution, we analyzed the electron screening effect on electron capture at the presupernova stage. Methods. The relativistically degenerate electron liquid screening potential derived from the linear response theory are adopted. The calculation of the electron capture rates is based on the shell-model. Both the change of electron energy and the shift in the threshold for electron capture in screening are taken into account. Results. The results indicate that the influence of electron screening on the electron capture is prominent in high-density matter. As the improved electron capture rate is considered, screening effect on the electron capture rate increases by about 1 percent at ρYe > 10 9 g/cm 3 . Conclusions. The influence of screening on the electron capture reaction is about 10 percent for 56 Co at ρYe ≈ 10 9 g/cm 3 . Screening may affect the structure and evolution of presupernova and should be included in any precise simulation.