关键词: 
相对论平均场 /
四级形变 /
相变

摘要: 利用形变约束的相对论平均场理论系统研究了N=60同中子核素的形状演化， 给出了这些核的基态结合能、 形变、 单粒子能级以及形变激发的位能曲线。 通过比较和分析发现， 随着质子数的增加， N=60同中子核的基态形变向轴对称形变方向演化， 114Xe和116Ba位于球形U（5）和轴对称SU（3）的过渡区， 存在形状相变的临界点结构， 这些结果与实验观测一致。 The shape phase transition between spherical U（5）and axially SU（3）deformed nuclei is investigated systemically for N=60 isotonic chain by the constrained relativistic mean|field theory with the interactions NL3 and PK1. The values of bind energy and quadruple deformation β2 are calculated and a good agreement is obtained as compared with the experiments. By examining the potential energy curve and single particle spectra obtained with this microscopic approach, the possible critical point nuclei with the structure of shape phase transition are suggested to be 114Xe and 116Ba, which is favored by the experiments.