s-wave quasiparticle resonance in neutron-rich drip-line nuclei
s-wave quasiparticle resonance in neutron-rich drip-line nuclei
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DOI：
10.1093/ptep/ptz136
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发表时间：
2019-07
影响因子：
3.5
通讯作者：
Y. Kobayashi;M. Matsuo
中科院分区：
文献类型：
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作者：
Y. Kobayashi;M. Matsuo
在坐标空间Hartree-Fock-Bogoliubov（Bogoliubov-de Genne）方程的框架下，通过描述中子在s波中的低能弹性散射，研究了成对关联滴线核中的非束缚单粒子态.本文对中子滴线碳同位素进行了数值研究，其中中子2s 1/2轨道位于接近零能量的位置。通过分析弹性散射的S矩阵极点，讨论了S波准粒子共振的性质，特别是滴线核的特性。研究发现，S矩阵有两对极点，一对极点表现为弱束缚态、虚态或共振态，另一对极点则表现为类似于束缚单粒子态的贡献。的$s$波准粒子共振出现了很大的变化依赖于配对间隙和单粒子能量的$s$轨道。
We investigate unbound single-particle states in pair-correlated drip-line nuclei by describing a low-energy elastic scattering of a neutron in the $s$-wave within the framework of the coordinate space Hartree–Fock–Bogoliubov (Bogoliubov–de Genne) equation. A numerical study is performed for a neutron drip-line carbon isotope where the neutron $2s_{1/2}$ orbit is located close to zero energy. Analyzing the S-matrix poles of the elastic scattering, we discuss properties of the $s$-wave quasiparticle resonance and, in particular, behaviors characteristic to drip-line nuclei. It is found that the S-matrix has two pairs of poles; one pair appears as either a weakly bound state, a virtual state or a resonance while the other pair makes a contribution analogous to a bound single-particle state. The $s$-wave quasiparticle resonance emerges with a large variation depending on the pairing gap and the single-particle energy of the $s$-orbit.