학술논문
First experimental determination of the radiative-decay probability of the 31− state in 12C for estimating the triple alpha reaction rate in high temperature environments
Document Type
article
Author
M. Tsumura; T. Kawabata; Y. Takahashi; S. Adachi; H. Akimune; S. Ashikaga; T. Baba; Y. Fujikawa; H. Fujimura; H. Fujioka; T. Furuno; T. Hashimoto; T. Harada; M. Ichikawa; K. Inaba; Y. Ishii; N. Itagaki; M. Itoh; C. Iwamoto; N. Kobayashi; A. Koshikawa; S. Kubono; Y. Maeda; Y. Matsuda; S. Matsumoto; K. Miki; T. Morimoto; M. Murata; T. Nanamura; I. Ou; S. Sakaguchi; A. Sakaue; M. Sferrazza; K.N. Suzuki; T. Takeda; A. Tamii; K. Watanabe; Y.N. Watanabe; H.P. Yoshida; J. Zenihiro
Source
Physics Letters B, Vol 817, Iss , Pp 136283- (2021)
Subject
Language
English
ISSN
0370-2693
Abstract
The triple alpha reaction is one of the most important reactions in the nuclear astrophysics. However, its reaction rate in high temperature environments at T9> 2 was still uncertain. One of the major origins of the uncertainty was that the radiative-decay probability of the 31− state in 12C was unknown. In the present work, we have determined the radiative-decay probability of the 31− state to be 1.3−1.1+1.2×10−6 by measuring the 1H(12C,12Cp) reaction for the first time, and derived the triple alpha reaction rate in high temperature environments from the measured radiative-decay probability. The present result suggests that the 31− state noticeably enhances the triple alpha reaction rate although the contribution from the 31− state had been assumed to be small.