论文标题
关于侏儒和巨型共振的微观理论
On microscopic theory of pygmy- and giant resonances
论文作者
论文摘要
基于有限的费米 - 系统的自洽理论，具有一致的声子耦合（PC）的绿色函数形式主义，用于在魔法核中使用pygmy和巨型多极的共振，目的是考虑粒子孔（pH）和复杂的1p1h phonon配置。获得了描述核极化性的有效领域的新方程。它包含在所考虑的能源区域中感兴趣的新PC贡献。它们是由于：i）标准pH-泄漏器中的t效应，ii）在第二个pH通道和粒子粒子通道中的两个新的诱导相互作用（由ph-phonon的交换引起），以及iii），是声子场中有效相互作用的第一个和第二个变化。获得了地面和激发状态之间过渡的能量和概率的一般表达。对新术语进行定性分析和讨论。
The Green function formalism with a consistent account for phonon coupling (PC), based on the self-consistent theory of finite Fermi-systems, is applied for pygmy- and giant multipole resonances in magic nuclei with the aim to consider particle-hole (ph) and complex 1p1h phonon configurations. A new equation for the effective field, which describes nuclear polarizability, is obtained. It contains new PC contributions which are of interest in the energy region under consideration. They are due to: i)the tadpole effect in the standard ph-propagator, ii)two new induced interactions (caused by the exchange of ph-phonon) in the second ph-channel and in the particle-particle channels, and iii) the first and second variations of the effective interaction in the phonon field. The general expressions for energies and probabilities of transitions between the ground and excited states are obtained. The qualitative analysis and discussion of the new terms are performed.
