Xe、Ba和Ce同位素偶偶核形变演化研究

Research on the shape evolution of even-even Xe,Ba and Ce isotopes

利用反射不对称相对论平均场理论(reflection asymmetric relativistic mean field,简称RAS-RMF)对Xe、Ba和Ce同位素偶偶核形状演化进行研究.结果表明:RAS-RMF理论能很好地描述Xe、Ba和Ce同位素偶偶核的基态性质,计算出的结合能和四极形变与已有的实验数据一致,八极形变对基态性质有重要影响.获得的物质密度分布清晰地展现出Xe、Ba和Ce同位素偶偶核的形状演化规律,反射不对称自由度在其中起重要作用.

The ground state properties and the shape evolution of even-even Xe, Ba and Ce isotopes were investigated by the Reflection Asymmetric Relativistic Mean Field （RAS- RMF ） theory. Calculations showed that the RAS-RMF theory presented a good description on the properties of ground states for the consideration of reflecting asymmetric degree of freedom. The calculated binding energy agreed with the experimental data well. The shape evolution of even-even Xe, Ba and Ce isotopes were clearly demonstrated by the deformation parameters and matter density distributions. The results showed that octupole deformation had a significant influence on the ground state properties of nuclei, in which reflection asymmetric degree of freedom played an important role.