中文摘要：

在相互作用玻色子模型中引入了一种新的高阶项，并对过渡区原子核量子相变进行了研究。首先对能量曲面进行分析，结果发现高阶项可以描述原子核基态的三轴形变。接着应用到192 Pt核和188 Os核中，计算了电四极B（E2）跃迁值。结果表明高阶项效应十分明显。

英文摘要：

We introduce a new higher-order term in the interacting boson model and study the quantum phase transition patterns .Firstly ,the energy of ground state will be analyzed while changing the dif-ferent parameters .The results show that this higher-order can explain triaxial deformation of ground state .Then the application will be made for nuclei of 192 Pt and 188 Os ,the results of the B（E2） transi-tion values show that the effect of higher-order term is very obvious .