Average Radiation Widths and the Giant Dipole Resonance Width
Average Radiation Widths and the Giant Dipole Resonance Width
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平均辐射宽度和巨偶极子共振宽度
DOI：
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发表时间：
1983
期刊：
影响因子：
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通讯作者：
M. Arnould
中科院分区：
文献类型：
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作者：
F. Thielemann;M. Arnould
平均EL辐射宽度可以根据巨偶极共振（GDR）的能量Eq和宽度Tq来计算。虽然各种模型都可以相当可靠地预测EG，但关于ΓG的理论情况远不令人满意。我们提出了一个简单的唯象模型，它能提供与球形或形变中重核的实验数据符合得很好的ΓG值。特别地，该模型可以考虑在ΓG中的壳效应，并且可以与液滴模型结合使用。用这种方法导出的ΓG值计算了平均E1辐射宽度，与实验值十分接近。当需要核的扩展集的GDR特性时，如在核天体物理学中的情况，所提出的计算ΓG的方法似乎也很适合。
The average EL radiation width can be calculated in terms of the energy Eq and width Tq of the Giant Dipole Resonance (GDR). While various models can predict EG quite reliably, the theoretical situation regarding ΓG is much less satisfactory. We propose a simple phenomenological model which is able to provide ΓG values in good agreement with experimental data for spherical or deformed intermediate and heavy nuclei. In particular, this model can account for shell effects in ΓG, and can be used in conjunction with the droplet model. The ΓG values derived in such a way are used to compute average El radiation widths which are quite close to the experimental values. The method proposed for the calculation of ΓG also appears to be well suited when the GDR characteristics of extended sets of nuclei are required, as is namely the case in nuclear astrophysics.