BROWSE

Related Scientist

sunghoon,ahn's photo.

sunghoon,ahn
희귀핵연구단
more info

ITEM VIEW & DOWNLOAD

12C+12C Reaction Rates and the Evolution of a Massive Star

Cited 0 time in webofscience Cited 0 time in scopus
20 Viewed 0 Downloaded
Title
<sup>12</sup>C+<sup>12</sup>C Reaction Rates and the Evolution of a Massive Star
Author(s)
Seong, Gwangeon; Kim, Yubin; Kwak, Kyujin; Sunghoon Ahn; Chaeyeon Park; Kevin Insik Hahn; Kim, Chunglee
Publication Date
2024-07
Journal
Journal of the Korean Astronomical Society, v.57, no.2, pp.115 - 122
Publisher
한국천문학회
Abstract
Carbon fusion is important to understand the late stages in the evolution of a massive star. Astronomically interesting energy ranges for the C-12+C-12 reactions have been, however, poorly constrained by experiments. Theoretical studies on stellar evolution have relied on reaction rates that are extrapolated from those measured in higher energies. In this work, we update the carbon fusion reaction rates by fitting the astrophysical S-factor data obtained from direct measurements based on the Fowler, Caughlan, & Zimmerman (1975) formula. We examine the evolution of a 20M(circle dot) star with the updated C-12+C-12 reaction rates performing simulations with the MESA (Modules for Experiments for Stellar Astrophysics) code. Between 0.5 and 1 GK, the updated reaction rates are 0.35 to 0.5 times less than the rates suggested by Caughlan & Fowler (1988). The updated rates result in the increase of core temperature by about 7% and of the neutrino cooling by about a factor of three. Moreover, the carbon-burning lifetime is reduced by a factor of 2.7. The updated carbon fusion reaction rates lead to some changes in the details of the stellar evolution model, their impact seems relatively minor compared to other uncertain physical factors like convection, overshooting, rotation, and mass-loss history. The astrophysical S-factor measurements in lower energies have large errors below the Coulomb barrier. More precise measurements in lower energies for the carbon burning would be useful to improve our study and to understand the evolution of a massive star.
URI
https://pr.ibs.re.kr/handle/8788114/15777
DOI
10.5303/JKAS.2024.57.2.115
ISSN
1225-4614
Appears in Collections:
Center for Exotic Nuclear Studies(희귀 핵 연구단) > 1. Journal Papers (저널논문)
Files in This Item:
There are no files associated with this item.

qrcode

  • facebook

    twitter

  • Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.
해당 아이템을 이메일로 공유하기 원하시면 인증을 거치시기 바랍니다.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse