Nuclear uncertainties in the s-process simulation

Nuclear uncertainties in the s-process simulation
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s 过程模拟中的核不确定性

DOI:
10.1007/s11433-013-5067-8
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发表时间:
2013-03
期刊:
Science China Physics,Mechanics & Astonomy
影响因子:
--
通讯作者:
Shi JianRong
Shi JianRong
中科院分区:
其他
文献类型:
--
作者:
Guo JianYou;Hou SuQing;Li ZhiHong;Shi JianRong

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宇宙中的重元素主要是在S过程和r过程中分别在AGB恒星和超新星中形成的。S和r核合成的模拟很大程度上取决于反应链上所有核的中子俘获和弱衰变率。本文系统地分析了S过程核的中子俘获率(截面),包括∼-200核上的∼-3000中子俘获率。用不同的数据集作为核输入,对恒温S过程进行了网络计算,考察了预测的S丰度的不确定性。我们发现,许多S过程核上的中子俘获截面仍然存在很大的不确定性,这导致了S过程同位素丰度测定的低精度。我们分析了相同的唯一等压核的中子俘获截面数据,这些数据按年份与以前的工作一致。分析表明,S过程的研究已有五十多年的历史,并分别在1976年和2002年前后出现了两个研究阶段。强调了未来实验和理论工具的需要和机会,以消除中子俘获率方面的现有缺点。
The heavy elements in the Universe are formed during the s- and r-processes mainly in AGB stars and supernovae, respectively. Simulation of s- and r-nucleosynthesis critically depends on the neutron capture and weak decay rates for all the nuclei on the reaction chain. The present work analyzes systematically the neutron capture rates (cross sections) for the s-process nuclei, including ∼3000 rates on ∼200 nuclei. The network calculations for the constant temperature s-process have been performed using the different data sets selected as the nuclear inputs to investigate the uncertainties in the predicted s-abundances. We show that the available cross sections of neutron capture on many s-process nuclei still carry large uncertainties, which lead to low accuracy in the determination of s-process isotope abundances. We analyze the neutron capture cross section data for the same unique isobar nucleus accorded by year from previous work. Such an analysis indicates that the s-process has been studied for more than fifty years and there exist two research stages around 1976 and 2002, respectively. The needs and opportunities for future experiments and theoretical tools are highlighted to remove the existing shortcomings in the neutron capture rates.
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