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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Effect of broken axial symmetry on the electric dipole strength and the collective enhancement of level densities in heavy nuclei
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Effect of broken axial symmetry on the electric dipole strength and the collective enhancement of level densities in heavy nuclei

机译：破裂轴对称对电偶极力的影响及重核水平密度的集体增强

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摘要

The basic parameters for calculations of radiative neutron capture, photon strength functions and nuclear level densities near the neutron separation energy are determined based on experimental data without an ad hoc assumption about axial symmetry-at variance to previous analysis. Surprisingly few global fit parameters are needed in addition to information on nuclear deformation, taken from Hartree Fock Bogolyubov calculations with the Gogny force, and the generator coordinator method assures properly defined angular momentum. For a large number of nuclei the GDR shapes and the photon strength are described by the sum of three Lorentzians, extrapolated to low energies and normalised in accordance to the dipole sum rule. Level densities are influenced strongly by the significant collective enhancement based on the breaking of shape symmetry. The replacement of axial symmetry by the less stringent requirement of invariance against rotation by 180 degrees leads to a novel prediction for radiative neutron capture. It compares well to recent compilations of average radiative widths and Maxwellian average cross sections for neutron capture by even target nuclei. An extension to higher spin promises a reliable prediction for various compound nuclear reactions also outside the valley of stability. Such predictions are of high importance for future nuclear energy systems and waste transmutation as well as for the understanding of the cosmic synthesis of heavy elements.
机译：基于实验数据确定了中子分离能量附近的辐射中子捕获，光子强度功能和核水平密度的基本参数，没有关于轴对称性的临时假设 - 在先前分析的方差。令人惊讶的是，除了核变形的信息之外，还需要少数全球合适参数，从Hartree Fock Bogolyubov计算与Gogny Force，并且发电机协调器方法确保正确定义角色。对于大量核来说，GDR形状和光子强度由三个Lorentzian的总和描述，推断到低能量并根据偶极子规则归一化。基于形状对称性的破裂的显着集体增强，水平密度受到强烈影响。通过减少旋转的不变性要求替换轴对称性的轴向对称性导致对辐射中子捕获的新预测。它甚至是偶数靶核的中子捕获的平均辐射宽度和最长孔平均横截面的综合。较高旋转的延伸承诺在稳定性谷范围之外，对各种复合核反应的可靠预测。这种预测对于未来的核能系统和废物嬗变以及对宇宙合成的重点的理解具有很高的重要性。

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