光子数据对重核中的GDR扩展宽度提供了新的解释
Photon data shed new light upon the GDR spreading width in heavy nuclei
摘要：
本文对质量数A>80时等矢量巨偶极共振（GDR）及其以下的电偶极强度进行了全球性研究。它依赖于最近建立的非常好的匹配数据的核光效应，以新颖的光子散射数据覆盖的区域低于中子发射阈值，以及平均共振中子捕获（ARC）。从这些数据的广泛的能量覆盖的GDR扩展宽度与能量的相关性可以研究具有显着的精度。一个明确的敏感性的核形状的细节，即β-和γ-变形，被证明。在此基础上提出了一个新的参数化的核电偶极强度的能量依赖性-只有两个新的参数-允许描述的偶极强度在所有的重核与A>80。虽然它与以前的参数化显着不同，它适用于球形，过渡，三轴和变形良好的核。GDR扩展宽度以规则的方式取决于相应的共振能量，但它与光子能量无关。
英文摘要：
A global study of the electric dipole strength in and below the isovector giant dipole resonance (GDR) is presented for mass numbers A>80. It relies on the recently established remarkably good match between data for the nuclear photo effect to novel photon scattering data covering the region below the neutron emission threshold as well as by average resonance neutron capture (ARC). From the wide energy coverage of these data the correlation of the GDR spreading width with energy can be studied with remarkable accuracy. A clear sensitivity to details of the nuclear shape, i.e. the beta- and gamma-deformations, is demonstrated. Based hereon a new parameterization of the energy dependence of the nuclear electric-dipole strength is proposed which - with only two new parameters - allows to describe the dipole strength in all heavy nuclei with A>80. Although it differs significantly from previous parameterizations it holds for spherical, transitional, triaxial and well deformed nuclei. The GDR spreading width depends in a regular way on the respective resonance energy, but it is independent of the photon energy.
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。
