张量力对原子核性质的影响(英文)

Effects of Tensor Force on Properties of Finite Nuclei

最近一段时期,对张量力性质研究成为原子核结构研究的热点之一。基于自洽的Skyrme平均场理论讨论了张量力研究的最新进展。同时,讨论了张量力和Skyrme能量密度中的中心交换项对原子核单粒子态的演化以及多极巨共振的贡献。发现考虑张量力贡献后,利用Skyrme平均场计算可以基本描述Z=50和N=82原子核单粒子态演化的实验结果。而张量力对于原子核电多极巨共振基本没有影响,只对其低能集体态有一定的影响。张量力的引入使得原子核磁单极巨共振的能量和强度发生显著的改变。通过对数值结果的分析,发现张量力会产生吸引的粒子-空穴剩余相互作用。

The impact of the tensor force on the properties of finite nuclei is discussed by analyzing the spin-orbit splittings and the multipole giant resonances in nuclei.It is found that the tensor force do plays an important role in nuclear structure.The experimental isospin dependence of the spin-orbit splitting is very well depicted when the tensor force is included.The tensor force has a larger effect on the spin flip magnetic dipole states than on the natural parity isoscalar quadrupole（2＋） states.By analyzing the modifications to the Hartree-Fock mean field induced by the tensor terms,and the specific features of the residual particle-hole tensor interaction,we find that the tensor force gives an attractive contribution to the particle-hole matrix elements.