Skyrme-Hartree-Fock Description of the Dipole Strength in Neutron-Rich Tin Isotopes
Skyrme-Hartree-Fock Description of the Dipole Strength in Neutron-Rich Tin Isotopes
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富中子锡同位素偶极子强度的 Skyrme-Hartree-Fock 描述
DOI：
10.1142/s0218301311017636
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
P. Reinhard
中科院分区：
文献类型：
--
作者：
J. Kvasil;V. Nesterenko;W. Kleinig;D. Bozhik;P. Reinhard
在具有不同Skyrme力的Skyrme随机相近似(RPA)框架下，分析了富中子132-164Sn同位素的低能E_1强度。应用双折叠过程来考虑RPA以外的能量依赖的宽度效应。所有考虑的Skyrme力都表明在开壳同位素142-164Sn中存在软的长条形变形。侏儒共振能区的积分E_1强度随着中子数的增加而增大。巨偶极子共振分支的相互补偿效应严格抑制了形变对粒子发射阈值附近积分强度的影响(这是一个强烈的天体物理兴趣)。所得结果与相对论平均场模型以前的结果符合得很好。
Low-energy E1 strength in neutron-rich 132-164Sn isotopes is analyzed in the framework of the Skyrme random phase approximation (RPA) with different Skyrme forces. A double folding procedure is applied to take into account the energy-dependent width effects beyond RPA. All the considered Skyrme forces indicate a soft prolate deformation in the open shell isotopes 142-164Sn. The integrated E1 strength in the energy region of the pygmy resonance grows with the neutron number. The influence of deformation on the integrated strength near the particle emission thresholds (which is of a keen astrophysical interest) is strictly suppressed by the mutual compensation effect for the branches of the giant dipole resonance. The results obtained are in a good agreement with the previous findings of the relativistic mean field model.