Effects of Triple-$α$ and $^{12}\rm C(α,γ)^{16}O$ Reaction Rates on the Supernova Nucleosynthesis in a Massive Star of 25 $M_{\odot}$

Yukihiro Kikuchi, Masa-aki Hashimoto, Masaomi Ono, Ryohei Fukuda

Published 2014-10-28Version 1

We investigate effects of triple-$\alpha$ and $^{12}\rm C(\alpha,\gamma) ^{16}O$ reaction rates on the production of supernova yields for a massive star of 25 $M_{\odot}$ whose helium core is considered to be around a 8 $M_{\odot}$. We combine the reaction rates to see the rate dependence, where the rates are considered to cover the possible variation of the rates. We adopt four combinations of the reaction rates from the two triple-$\alpha$ reaction rates and two $^{12}\rm C(\alpha,\gamma)^{16}O$ ones. We compare the calculated abundance ratios with the solar system abundances and deduce some constraints to the reaction rates. As the results, the conventional rate is adequate for the triple-$\alpha$ reaction rate and rather higher value of the reaction rate is favorable for the $^{12}\rm C(\alpha,\gamma)^{16}O$ rate.