反射不对称相对论平均场理论对Ce同位素链形状演化的研究  

Analysis of shape evolution for Ce isotopes with the reflection asymmetric relativistic mean field theory

作　　者：黄海[1,2] 郭建友[2] 

机构地区：[1]安徽医科大学物理教研室,合肥230032 [2]安徽大学物理与材料科学学院,合肥230039

出　　处：《中国科学：物理学、力学、天文学》2013年第1期69-75,共7页Scientia Sinica Physica,Mechanica & Astronomica

摘　　要：用反射不对称相对论平均场理论(Reflection Asymmetric Relativistic Mean Field,i.e.:RAS-RMF)对Ce同位素链的基态性质及形状演化进行了研究.结果表明:引入反射不对称自由度自由度,RMF理论能很好地描述Ce同位素的基态性质,计算的结合能与实验数据符合得相当好,获得的形变参数、单粒子能级、物质密度分布及位能曲线清晰地展现出偶偶核Ce同位素的形状演化.The ground state properties and the shape evolution of Ce isotopes are investigated by the Reflection Asymmetric Relativistic Mean Field （RAS-RMF） theory. Calculations show that the RAS-RMF theory presents a better description on the properties of ground states for the consideration of reflecting asymmetric degree of freedom. The calculated binding energy agrees the experimental data well. The shape evolution of even-even Ce isotopes is shown clearly from the spherical 140 Ce to the quadrupole deformation 144Ce, and well-developed octupole deformation 146–152Ce, and finally back to quadrupole deformation 156Ce from the calculated deformations, single particle neutron energies, matter density distributions and potential energy surfaces.

关 键 词：反射不对称相对论平均场 形状演化和相变 八极形变 

分 类 号：O412.1[理学—理论物理] O562.6[理学—物理]