Shell model study on the astrophysical neutron capture of 8Li

Shell model study on the astrophysical neutron capture of 8Li
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8Li天体物理中子俘获壳模型研究

DOI:
10.1140/epja/i2012-12125-3
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发表时间:
2012-09
影响因子:
2.7
通讯作者:
Xi-Zhen Zhang
Xi-Zhen Zhang
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Hai-Liang Ma;Bao-Guo Dong;Yu-Liang Yan;Xi-Zhen Zhang

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结合壳层模型和势模型研究了8Li的天体物理重要中子俘获。用SFO、PSDMK2和PSDWBP三种有效相互作用计算了光谱因子和反应宽度。对于从8Li到9Li第一连续态的共振俘获,三种有效相互作用给出了相似的中子部分宽度,并与实验结果进行了很好的比较。然而,计算出的光子宽度比之前估计的要小5倍以上。这将产生实质性的不同,即在高温下,直接捕获机制仍然占主导地位。计算的捕获率与实验数据基本吻合。计算截面和俘获速率的不确定性主要是由于对三种有效相互作用的光谱因子的不同预测造成的。我们计算的T9和Lt;5的总中子俘获率小于4300cm~3−_1 S−_1,这证实了在恒星环境中主反应流将通过反应8Li(α,n)11B进行。
The astrophysical important neutron capture of 8Li is investigated by combining the shell model and potential model. Three effective interactions, SFO, PSDMK2 and PSDWBP are used to calculate the spectroscopic factors and reaction widths. For the resonant capture from 8Li to the first continuum state of 9Li , the three effective interactions give similar neutron partial widths, and they are well compared with the experimental results. However, the calculated photon widths are over 5 times less than the previous estimate. This will make the substantial difference that, at high temperature, the direct capture mechanism still dominates. The calculated capture rates generally agree well with the experimental data. The uncertainty of calculated cross-sections and capture rates mainly results from the different prediction of spectroscopic factors for the three effective interactions. The total neutron capture rates in our calculations are less than 4300 cm3 mole−1 s−1 for T9 < 5 which confirms that the main reaction flow will proceed through the reaction 8Li (α, n) 11B in the stellar environments.
DOI: 10.1086/185538
发表时间: 1989-10
期刊: The Astrophysical Journal
影响因子: --
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发表时间: 1984-01-01
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WITTEN, E
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发表时间: 1967-10
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