Effects of a new triple-α reaction on the s-process in massive stars

Yukihiro Kikuchi, Masaomi Ono, Yasuhide Matsuo, Masa Aki Hashimoto, Shin Ichiro Fujimoto

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Abstract

Effects of a new triple-α reaction rate on the s-process during the evolution of a massive star of 25 M are investigated for the first time. Although the s-process in massive stars has been believed to be established with only minor change, we find that the s-process with use of the new rate during the core He-burning is very inefficient compared to the case with the previous triple-α rate. However, the difference of the overproduction is found to be largely compensated by the subsequent C-burning. Since the s-process in massive stars has been attributed so far to the neutron irradiation during core He-burning, our finding reveals the importance of C-burning for the s-process during the evolution of massive stars. Since the overproduction level is not different as a whole for the two distinctly different rates, the weak s-process in massive stars does not testify the validity of the new rate.

Original languageEnglish
Pages (from-to)171-178
Number of pages8
JournalProgress of Theoretical Physics
Volume127
Issue number1
DOIs
Publication statusPublished - Jan 1 2012

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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    Kikuchi, Y., Ono, M., Matsuo, Y., Hashimoto, M. A., & Fujimoto, S. I. (2012). Effects of a new triple-α reaction on the s-process in massive stars. Progress of Theoretical Physics, 127(1), 171-178. https://doi.org/10.1143/PTP.127.171