Microscopic nature of the pygmy dipole resonance: the stable Ca isotopes.
Microscopic nature of the pygmy dipole resonance: the stable Ca isotopes.
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侏儒偶极子共振的微观性质：稳定的 Ca 同位素。
DOI：
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发表时间：
2004
影响因子：
8.6
通讯作者：
A. Zilges
中科院分区：
文献类型：
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作者：
T. Hartmann;M. Babilon;S. Kamerdzhiev;E. Litvinova;D. Savran;S. Volz;A. Zilges
首次在高分辨率光子散射实验中测量到 44Ca 中的电偶极子强度分布高达 10 MeV。将获得的数据与早期 (40,48)Ca 的测量结果进行比较，以观察电侏儒偶极子共振 (PDR) 的演变。在有限费米系统的微观扩展理论框架内进行的计算，将准粒子-声子耦合的贡献添加到随机相位近似计算中，与所有三种同位素的实验数据定性一致。我们已经证明，有必要包含这种耦合来描述 PDR。
The electric dipole strength distribution in 44Ca has been measured up to 10 MeV in high resolution photon scattering experiments for the first time. The data obtained have been compared to earlier measurements on (40,48)Ca in order to view the evolution of the electric pygmy dipole resonance (PDR). Calculations that were performed within the framework of the microscopic extended theory of finite Fermi systems, which adds contributions of the quasiparticle-phonon coupling to random phase approximation calculations, give a qualitative agreement with the experimental data for all three isotopes. We have shown that it is necessary to include this coupling to describe the PDR.