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arXiv 1304.0928nucl-th
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费米液体理论中巨偶极共振态逃逸宽度的计算

Evaluation of the escape widths of the giant dipole resonances in the fermi-liquid theory

V. A. Sadovnikova

摘要:

在有限费米系统理论中,人们指出,核中的巨共振可以看作是耗尽了大部分能量加权和规则的零声激发。在[1]的框架下,考虑了对称核物质中零声色散方程ω_s(k)的解。这些解的计算方法是基于偏振算子的解析结构<$(ω,k)。色散方程的解,这是真正的在小k,成为复杂的与k增加时,开始重叠的集体和1 p1 h模式。ω s(k)的虚部是集体零声激发衰减到实粒子-空穴对的结果,可以与共振态的逃逸宽度相比较。本文比较了在确定波矢k= kA下,核A巨偶极共振(GDR)的实验能量和逃逸宽度与Re ω s(k)和Imω s(k)的关系。

英文摘要:

In the theory of the finite fermi-systems [1], it was shown that giant resonances in nuclei can be consider as the zero-sound excitations which exhaust the large part of the energy-weighted sum rules. In the framework of [1] the solutions of the zero-sound dispersion equation in the symmetric nuclear matter, ω_s(k), are considered. The method of calculation of these solutions is based on the analytical structure of the polarization operators Π(ω,k). The solutions of the dispersion equation, which are real at small k, become complex with k increasing when the overlapping of the collective and 1p1h modes starts. The imaginary part of ω_s(k) is the result of the collective zero-sound excitation decay to the real particle-hole pairs and can be compared with the escape width of resonances. We compare the experimental energy and escape width of the giant dipole resonance (GDR) in the nucleus A with Reω_s(k) and Imω_s(k) taken at a definite wave vector k=k_A.

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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