Constraining the External Capture to the O-16 Ground State and the E2 S Factor of the C-12(alpha,gamma)O-16 Reaction
Constraining the External Capture to the O-16 Ground State and the E2 S Factor of the C-12(alpha,gamma)O-16 Reaction
复制标题
将外部捕获约束到 O-16 基态和 C-12(alpha,gamma)O-16 反应的 E2 S 因子
DOI：
10.1103/physrevlett.124.162701
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发表时间：
2020
影响因子：
8.6
通讯作者：
Liu W. P.
中科院分区：
文献类型：
--
作者：
Shen Y. P.;Guo B.;deBoer R. J.;Li Z. H.;Li Y. J.;Tang X. D.;Pang D. Y.;Adhikari S.;Basu C.;Su J.;Yan S. Q.;Fan Q. W.;Liu J. C.;Chen C.;Han Z. Y.;Li X. Y.;Lian G.;Ma T. L.;Nan W.;Nan W. K.;Wang Y. B.;Zeng S.;Zhang H.;Liu W. P.
Thereaction is one of the most crucial reactions in nuclear astrophysics. Theexternal capture to theground state (GS) has not been emphasized in previous analyses but may make a significant contribution to thecross section depending on the value of the GS asymptotic normalization coefficient (ANC). In the present work, we determine this ANC to bethrough thereaction using a high-precision magnetic spectrograph. This sheds light on the existing large discrepancy of more than 2 orders of magnitude between the previously reported ANC values. Based on the new ANC, we experimentally constrain the GS external capture and show that through interference with the high energy tail of thesubthreshold state, a substantial enhancement in the GSfactor can be obtained () compared to that of a recent review (45 keV b), resulting in an increase of the totalfactor from 140 to 162 keV b, which is now in good agreement with the value obtained by reproducing supernova nucleosynthesis calculations with the solar-system abundances. This work emphasizes that the external capture contribution for the ground state transition cannot be neglected in future analyses of thereaction.
