【摘要】 对于发生在同1个原子核中的从一种高激发模式向着低激发模式演化的物理图像,给出了一种新的理解:被布居到高角动量态的高有序激发核,以E2跃迁的方式先行退耦到转晕带,再退耦到共存区(或临界点)时释放了有序的结构能,诱发价核子对耦合强度改变,重新组合出低有序的激发模式基准态,实现了基准态结构的过渡;从微观上看,这是一种既温和而又平稳的转变。这种共存区(或临界点)在不同核素中位置的改变,就是研究基态量子相变的理论基础。文章阐述了连续发生两次这类相变的可能,并以180,182Hf核为例作了深入探讨。更多还原

【Abstract】 A new standpoint is proposed for understanding the quantum phase transition from a higher-ordered excitation model to other lower-ordered one.It suggests that a nucleus populating at high-spin state is decoupled firstly to the yrast-band with the E2-trasitions mode,and then to the coexist region,wherein the structure-energy is released,the change of the nucleon coupling intensity is caused,finally the ground-states of the lower-ordered excitation model is reconstructed,the evolution of ground-state structure occurs.Microscopically,this is a benignancy and calm transition.In addition,an explanation is given to the possibility that two phase transitions can occur in some isotopes.A detailed discussion is presented with the 180,182Hf nuclei as an example.更多还原