First experimental constraint of the spectroscopic amplitudes for the alpha-cluster in the B-11 ground state
First experimental constraint of the spectroscopic amplitudes for the alpha-cluster in the B-11 ground state
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B-11 基态 α 团簇光谱振幅的首次实验约束
DOI：
10.1016/j.physletb.2019.134820
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发表时间：
2019
影响因子：
4.4
通讯作者：
Liu W. P.
中科院分区：
文献类型：
--
作者：
Shen Y. P.;Guo B.;Ma T. L.;Pang D. Y.;Ni D. D.;Ren Z. Z.;Li Y. J.;An Z. D.;Su J.;Liu J. C.;Fan Q. W.;Han Z. Y.;Li X. Y.;Li Z. H.;Lian G.;Su Y.;Wang Y. B.;Yan S. Q.;Zeng S.;Liu W. P.
利用高精度磁谱仪首次对Li 7（Li 6，d）11 B反应中B 11基态α团簇的光谱振幅进行了实验测定.这被认为对α-诱导反应的研究有很大的影响，而α-诱导反应在核天体物理学中是至关重要的。结果表明，与现有实验测定的SA相比，以前的壳模型计算的B 11的SA对C12（α，γ）16 O S E2（300）因子和C13（α，n）16 O S（190）因子分别高估了23%和34%。由于这两个反应的重要性，例如恒星模拟要求C12（α，γ）16 O在Ecm = 300 keV处截面的不确定度优于10%，新的S因子可能会对天体物理网络计算产生潜在的影响。
We present the first experimental determination on the spectroscopic amplitudes (SAs) for the α-cluster in the B 11 ground state via the Li 7 (Li 6, d) 11 B reaction using a high-precision magnetic spectrograph. This is believed to have a strong effect on the studies of α-induced reactions which are crucial in nuclear astrophysics. It is found that the previous SAs of B 11 from shell model calculations cause overestimations of up to 23% for the C 12 (α, γ) 16 O S E 2 (300) factor and up to 34% for the C 13 (α, n) 16 O S (190) factor with respect to the results from the present experimentally determined SAs. Due to the importance of these two reactions, for example the uncertainty in the C 12 (α, γ) 16 O cross section at E cm= 300 keV is required to be better than 10% by stellar modeling, the new S-factors could result in a potential influence on the astrophysical network calculations.