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arXiv 2103.05181nucl-th
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在HFB框架内对$NA$ -散射的共振和配对效应的分类

Classification of resonances and pairing effects on $NA$-scattering within the HFB framework

K. Mizuyama, H. Cong Quang, T. Dieu Thuy, T. V. Nhan Hao

摘要:

在Hartree-Fock-Bogoliubov(HFB)框架下,利用Jost函数框架和Strum-Liouville理论分析了作为S-和K-矩阵极点的散射解的性质,阐明了散射解可以定义为物理状态.我们发现存在三种类型的共振:“{ \it形状共振}"、“{ \it粒子型共振}”和“{ \it空穴型准粒子共振}",另外两种类型的解作为独立的S-矩阵和K-矩阵极点给出.形状共振是由Hartree-Fock(HF)平均场势形成的,受配对关联的影响不大。粒子型准粒子共振和空穴型准粒子共振是由粒子态和空穴态通过配对的组态混合效应产生的。所有的共振都由S-矩阵极点表示,S-矩阵极点具有相应的K-矩阵极点。另外两种类型的解决方案,给出了独立的S-矩阵和K-矩阵极点。这些极点由HF平均场势形成。配对对独立的S-矩阵极点的影响较小,而对独立的K-矩阵极点的影响显著。独立的K矩阵极点在通过配对效应接近共振时破坏准粒子共振。所有共振态的波函数都具有亚稳性质的特征结构。然而,准粒子共振的波函数的亚稳结构可以被独立的驻波解或Fano效应打破。

英文摘要:

We analyze the properties of the scattering solutions obtained as the pole of the S- and K-matrix with the help of the Jost function framework and the Strum-Liouville theory within the Hartree-Fock-Bogoliubov(HFB) framework, and clarify the scattering solutions which can be defined as the physical state. We found that there are three types of the resonances; "{\it shape resonance}", "{\it particle-type}" and "{\it hole-type quasiparticle resonances}", and another two types of solutions are given as the independent S-matrix and K-matrix poles. The shape resonance is formed by the Hartree-Fock(HF) mean field potential, is not affected by the pairing correlation so much. The particle-type and hole-type quasiparticle resonances originate from the particle and hole states by the configuration mixing effect by pairing. All of resonance are represented by the S-matrix pole which has the corresponding K-matrix pole. Two other types of solutions are given by the independent S-matrix and K-matrix poles. These poles are formed by the HF mean field potential. The effect of pairing for the independent S-matrix pole is small, but the one for the independent K-matrix pole has the remarkable effect. The independent K-matrix pole destroys the quasiparticle resonance as it approaches to the resonance by the pairing effect. The wave function of all resonances have the characteristic structure of the metastable property. However, the metastable structure of the wave function of the quasiparticle resonance can be broken by the independent standing wave solution or the Fano effect.

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