Dipole strength of Ta181 for the evaluation of the Ta180 stellar neutron capture rate
Dipole strength of Ta181 for the evaluation of the Ta180 stellar neutron capture rate
复制标题
用于评估 Ta180 恒星中子俘获率的 Ta181 偶极子强度
DOI：
10.1103/physrevc.90.044301
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发表时间：
2014
影响因子：
3.1
通讯作者：
F. Dönau
中科院分区：
文献类型：
--
作者：
A. Makinaga;R. Massarczyk;R. Schwengner;M. Beard;F. Dönau
使用 9.6 MeV 能量的电子束产生的轫致辐射推导出高达中子分离能的光吸收截面。测量射线光谱的分析包括高能能级的准连续谱。进行射线级联模拟来估计非弹性跃迁的强度和基态跃迁的分支比。由此产生的光吸收截面显示出在 5 至 8 MeV 能量范围内偶极子强度增强，这可能与侏儒偶极子共振有关。本实验的结果与变形基础上的准粒子随机相位近似的预测进行了比较。目前的实验数据和数据的组合被用作统计代码的输入，用于计算对于核合成很重要的光核反应的横截面和反应速率。
The photoabsorption cross section ofup to the neutron-separation energy is deduced using bremsstrahlung produced with an electron beam of 9.6 MeV energy. The analysis of the measured-ray spectra includes the quasicontinuum of levels at high energy. Simulations of-ray cascades are performed to estimate intensities of inelastic transitions and branching ratios of the ground-state transitions. The resulting photoabsorption cross section shows enhanced dipole strength in the energy range from 5 to 8 MeV, which may be related to a pygmy dipole resonance. The results of the present experiment are compared with predictions of a quasiparticle-random-phase approximation in a deformed basis. A combination of the present experimental data anddata is used as an input to the statistical codetalysapplied to calculate cross sections and reaction rates of photonuclear reactions that are important for the nucleosynthesis of.