论文标题
$^{208} $ pb中的m1共振在自洽的声子耦合模型中
M1 resonance in $^{208}$Pb within the self-consistent phonon-coupling model
论文作者
论文摘要
本文的主要目的是从理论上研究$^{208} $ pb在基于Skyrme类型的能量密度功能（EDF）的自一致模型中，在$^{208} $ pb中对实验观察到的碎片。这种碎片（$ m1 $强度的传播）不在传统的单粒子（$ 1P1H $）随机相近似（RPA）中复制，因此必须在更复杂的模型的框架中进行研究。但是，以前应用的这种类型的模型不是自洽的。在目前的工作中，我们使用了最近开发的自搭配时间阻止近似（rentba）的重新归一化版本，其中$ 1P1H \ otimes $ phonon配置包含在RPA $ 1P1H $配置的顶部。我们已经确定了安装在Rentba和RPA中的修改后的Skyrme EDF的几组参数，并发现了在我们的型号中以$^{208} $ PB产生$ m1 $共振的片段的必要条件。我们还介绍了使用这些修改的参数化获得的$^{208} $ PB自然奇偶校验模式的第一个激发态的Rentba和RPA计算的结果。
The main goal of the paper is to investigate theoretically the experimentally observed fragmentation of the isovector $M1$ resonance in $^{208}$Pb within a self-consistent model based on an energy-density functional (EDF) of the Skyrme type. This fragmentation (spread of the $M1$ strength) is not reproduced in a conventional one-particle--one-hole ($1p1h$) random-phase approximation (RPA) and thus has to be investigated in the framework of more complicated models. However, previously applied models of this type were not self-consistent. In the present work, we use a recently developed renormalized version of the self-consistent time blocking approximation (RenTBA) in which the $1p1h\otimes$phonon configurations are included on top of the RPA $1p1h$ configurations. We have determined several sets of the parameters of the modified Skyrme EDF fitted within the RenTBA and RPA and have found the necessary condition of producing the fragmentation of the $M1$ resonance in $^{208}$Pb in our model. We present also the results of the RenTBA and RPA calculations for the first excited states of the natural parity modes in $^{208}$Pb obtained with these modified parametrizations.
