First experimental determination of the radiative-decay probability of the 3－1 state in 12C for estimating the triple alpha reaction rate in high temperature environments
First experimental determination of the radiative-decay probability of the 3－1 state in 12C for estimating the triple alpha reaction rate in high temperature environments
复制标题
首次实验测定 12C 下 3-1 态的辐射衰变概率，用于估计高温环境下的三重 α 反应速率
DOI：
10.1016/j.physletb.2021.136283
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发表时间：
2021
影响因子：
4.4
通讯作者：
et al.
中科院分区：
文献类型：
--
作者：
M. Tsumura,S. Kubono;et al.
三重α反应是核天体物理学中最重要的反应之一。然而，它在T9和GT；2高温环境下的反应速度仍然不确定。不确定性的主要来源之一是在12℃下3 1−态的辐射衰变概率是未知的。在本工作中，我们首次通过测量1H(12 C，12 Cp)反应确定了3 1−态的辐射衰变几率为1 3−1 1+1 2×10−6，并由测量的辐射衰变几率推导出高温环境下的三重α反应速率。目前的结果表明，尽管曾假设3 1−态的贡献很小，但3 1−态显著地提高了三重α反应速率。
The triple alpha reaction is one of the most important reactions in the nuclear astrophysics. However, its reaction rate in high temperature environments at T 9> 2 was still uncertain. One of the major origins of the uncertainty was that the radiative-decay probability of the 3 1− state in 12 C was unknown. In the present work, we have determined the radiative-decay probability of the 3 1− state to be 1.3− 1.1+ 1.2× 10− 6 by measuring the 1 H (12 C, 12 Cp) reaction for the first time, and derived the triple alpha reaction rate in high temperature environments from the measured radiative-decay probability. The present result suggests that the 3 1− state noticeably enhances the triple alpha reaction rate although the contribution from the 3 1− state had been assumed to be small.