论文标题
PB同位素的核心肿胀效果在$ n> 126 $
Pairing core swelling effect in Pb isotopes at $N>126$
论文作者
论文摘要
我们根据Skyrme Hartree-fock-Bogoliubov理论重新审视Pb同位素电荷半径的同位素转移的突然增加。针对选定的四种Skyrme相互作用优化的配对相互作用的新参数化大大改善了对此现象的描述。还研究了密度依赖性的自旋轨道相互作用，并进一步增加了电荷半径。配对相关性显着改变了Fermi水平附近中子轨道的性质，并在将PB同位素中的良好质子降低到$ n> 126 $中起着至关重要的作用。关于$^{208} $ pb作为“核心”核，提出了一种新颖的配对核心溶胀效果：配对相互作用通过收缩差异$ 1G_ {9/2} $ ORBIT的收缩来减少“价”中子轨道的半径，并将尖锐的$ 0I__ {11/2} $ ORBIT混合。同时，核心核膨胀，导致电荷半径突然增强，$ n> 126 $。这种特征行为出现在核表面附近的密度曲线中，其测量非常可取。
We revisit a sudden increase of the isotope shift of the charge radius of Pb isotope at $N>126$ based on a Skyrme Hartree-Fock-Bogoliubov theory. New parametrizations of the pairing interaction optimized for selected four Skyrme interactions greatly improve a description of this phenomenon. The density-dependent spin-orbit interaction is also investigated and further increases the charge radius. The pairing correlations significantly change the properties of the neutron orbits near the Fermi level and play a vital role in pulling out the well-bound protons in the Pb isotopes at $N>126$. Regarding $^{208}$Pb as a "core" nucleus, a novel pairing core swelling effect is proposed: The pairing interaction reduces the radius of "valence" neutron orbits by the shrinkage of diffused $1g_{9/2}$ orbit and the mixing of sharp $0i_{11/2}$ orbit. Simultaneously, the core nucleus swells, leading to the sudden enhancement of the charge radius at $N > 126$. This characteristic behavior appears in the density profile near the nuclear surface and its measurement is highly desirable.
