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arXiv 1401.0925nucl-exastro-ph.SRnucl-th
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核三轴性对重核电磁强度、能级密度和中子俘获截面的重要性

Importance of nuclear triaxiality for electromagnetic strength, level density and neutron capture cross sections in heavy nuclei

Eckart Grosse, Arnd R. Junghans, Ralph Massarczyk

摘要:

在未分辨共振的范围内的中子俘获的截面的同时预测水平的距离在中子阈值为100多个自旋0与A >70的目标核。假设在几乎所有这些核的三轴性,水平密度和光子强度的组合参数化。所使用的强度函数是基于一个全球性的适合IVGDR形状的总和三个洛伦兹加起来的TRK总和规则和理论为基础的预测的A-依赖极能量和扩展宽度。对于小自旋达到捕获能级密度很好地描述了只有一个自由的全球参数,一个显着的集体增强由于偏离轴对称观察。可靠的预测复合核反应的稳定性谷以外的预期从全球参数化是重要的核天体物理和核废料的嬗变。

英文摘要:

Cross sections for neutron capture in the range of unresolved resonances are predicted simultaneously to level distances at the neutron threshold for more than 100 spin-0 target nuclei with A >70. Assuming triaxiality in nearly all these nuclei a combined parameterization for both, level density and photon strength is presented. The strength functions used are based on a global fit to IVGDR shapes by the sum of three Lorentzians adding up to the TRK sum rule and theory-based predictions for the A-dependence of pole energies and spreading widths. For the small spins reached by capture level densities are well described by only one free global parameter; a significant collective enhancement due to the deviation from axial symmetry is observed. Reliable predictions for compound nuclear reactions also outside the valley of stability as expected from the derived global parameterization are important for nuclear astrophysics and for the transmutation of nuclear waste.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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