Effects of triple-$\alpha$ and $^{12}$C($\alpha$,$\gamma$)$^{16}$O reaction rates on the supernova nucleosynthesis in a massive star of 25$M_{\odot}$
Effects of triple-$\alpha$ and $^{12}$C($\alpha$,$\gamma$)$^{16}$O reaction rates on the supernova nucleosynthesis in a massive star of 25$M_{\odot}$
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三重 $alpha$ 和 $^{12}$C($alpha$,$gamma$)$^{16}$O 反应速率对 25$M_{ 大质量恒星中超新星核合成的影响
DOI：
10.1093/ptep/ptv072
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
and R. Fukuda
中科院分区：
文献类型：
--
作者：
Y. Kikuchi;M. Hashimoto;M. Ono;and R. Fukuda
我们研究了一颗质量为25的大质量星星的三重核反应速率对超新星产额的影响。我们结合联合收割机的反应速率来研究速率的依赖性，其中的速率被认为是涵盖了可能的变化率的基础上，在地球上的实验和理论。我们采用了两个三重反应速率和两个一重反应速率中的四种反应速率组合。首先，我们研究了20和25质量恒星的演化，它们的氦核分别对应于6和8质量恒星。虽然25颗恒星在所有的反应速率组合下都演化到了超新星前阶段，但在某些组合下，20颗恒星的演化路径明显不同，这对于超新星的祖先来说是不可接受的。其次，我们在球对称的限制下进行超新星爆炸的计算，并将计算出的丰度比与太阳系的丰度进行比较。我们可以推导出一些对反应速率的限制。结果表明，对于三重反应速率，常规速率是合适的，在实验不确定度的上限范围内，较高的反应速率值对arate是有利的。
We investigate effects of triple-andreaction rates on the production of supernova yields for a massive star of 25. We combine the reaction rates to examine the rate dependence, where the rates are considered to cover the possible variation of the rates based on experiments on the earth and theories. We adopt four combinations of the reaction rates from two triple-reaction rates and twoones. First, we examine the evolution of massive stars of 20 and 25whose helium cores correspond to helium stars of 6 and 8, respectively. While the 25stars evolve to the presupernova stages for all combinations of the reaction rates, evolutionary paths of the 20stars proceed significantly different way for some combinations, which are unacceptable for progenitors of supernovae. Second, we perform calculations of supernova explosions within the limitation of spherical symmetry and compare the calculated abundance ratios with the solar system abundances. We can deduce some constraints to the reaction rates. As the results, a conventional rate is adequate for a triple-reaction rate and a rather higher value of the reaction rate within the upper limit for the experimental uncertainties is favorable for arate.