Yukihiro Kikuchi, Masaomi Ono, Yasuhide Matsuo, Masa-aki Hashimoto, Shin-ichiro Fujimoto
Published 2011-10-02Version 1
Effects of a new triple-{\alpha} reaction rate on the s-process during the evolution of a massive star of 25 M\odot 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-{\alpha} 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.
Comments: 8 pages, 5 figures. Submitted to Prog. Theor. Phys. Letters on October 2, 2011
Journal: Prog. Theor. Phys. 127 (2012), 171-178
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