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First experimental determination of the radiative-decay probability of the 3 1 − state in 12C for estimating the triple alpha reaction rate in high temperature environments

2021; Elsevier BV; Volume: 817; Linguagem: Inglês

10.1016/j.physletb.2021.136283

1873-2445

M. Tsumura, T. Kawabata, Y. Takahashi, Satoshi Adachi, H. Akimune, S. Ashikaga, T. Baba, Yuki Fujikawa, H. Fujimura, Hiroyuki Fujioka, T. Furuno, T. Hashimoto, T. Harada, M. Ichikawa, K. Inaba, Yoshinori Ishii, N. Itagaki, Mitsuru Itoh, Chihiro Iwamoto, B. R. Ko, Ami S. Koshikawa, S. Kubono, Y. Maeda, Y. Matsuda, Shigenori Matsumoto, K. Miki, Takahiro Morimoto, Motoki Murata, T. Nanamura, I. Ou, S. Sakaguchi, A. Sakaue, Michele Sferrazza, Kenta Suzuki, T. Takeda, A. Tamii, Ken Watanabe, Y. Watanabe, H. P. Yoshida, J. Zenihiro,

Nuclear reactor physics and engineering

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.