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arXiv 1810.04556astro-ph.SRnucl-exnucl-th
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低质量星的s-过程核合成:由蒙特卡罗变分确定的核物理不确定性的影响

The s-process nucleosynthesis in low mass stars: impact of the uncertainties in the nuclear physics determined by Monte Carlo variations

G. Cescutti, R. Hirschi, N. Nishimura, T. Rauscher, J. den Hartogh, A. St. J. Murphy, S. Cristallo

摘要:

我们研究了中子俘获和弱反应(重元素)的不确定性对低质量恒星的s-过程核合成的影响,使用基于蒙特卡罗的方法。我们进行了广泛的核反应网络计算,包括新评估的温度依赖的上限和下限的个人反应速率。我们先进的方法能够评估对最终丰度影响更大的反应。我们发现,β衰变率的不确定性通常影响附近的S-过程分支的核素,而在最终丰度的不确定性是由中子捕获率的不确定性,直接产生或破坏感兴趣的核素。由重元素反应引起的总核不确定性约为50%。

英文摘要:

We investigated the impact of uncertainties in neutron-capture and weak reactions (on heavy elements) on the s-process nucleosynthesis in low-mass stars using a Monte-Carlo based approach. We performed extensive nuclear reaction network calculations that include newly evaluated temperature-dependent upper and lower limits for the individual reaction rates. Our sophisticated approach is able to evaluate the reactions that impact more significantly the final abundances. We found that beta-decay rate uncertainties affect typically nuclides near s-process branchings, whereas most of the uncertainty in the final abundances is caused by uncertainties in neutron capture rates, either directly producing or destroying the nuclide of interest. Combined total nuclear uncertainties due to reactions on heavy elements are approximately 50%.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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