Journal
PROGRESS OF THEORETICAL PHYSICS
Volume 127, Issue 1, Pages 171-178Publisher
PROGRESS THEORETICAL PHYSICS PUBLICATION OFFICE
DOI: 10.1143/PTP.127.171
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Funding
- Ministry of Education, Culture, Sports, Science and Technology of Japan [19104006, 21540272, 22540297]
- Grants-in-Aid for Scientific Research [22540297, 19104006, 24540278, 21540272] Funding Source: KAKEN
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Effects of a new triple-alpha reaction rate on the s-process during the evolution of a massive star of 25 M-circle dot 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. 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.
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