摘要: 为了探讨原子核系统中存在激发态量子相变的可能性，在相互作用玻色子模型框架下对有限玻色子系统中的激发态量子相变现象进行唯象分析，特别是针对角动量和有限N效应如何影响U（5）-SU（3）和SU（3）-O（6）过渡区中的激发态量子相变行为进行了系统研究。结果表明，低角动量振动谱中的激发态量子相变特征在现实玻色子数情况下可以很好地保持，但随着角动量增加相变特征逐渐消失。


In this work, a phenomenological analysis of the excited-state quantum phase transitions (ESQPTs) in the finite-N boson system has been carried out within the interacting boson model in order to reveal the possibility of finding ESQPTs in nuclear systems. Particularly, the angular momentum and finite-N effects on the ESQPTs in the U(5)-SU(3) and SU(3)-O(6) transitional regions have been systematically investigated. The results indicate that the main features of ESQPTs can be well preserved even at a realistic boson number for small angular momentum but will gradually disappear as the angular momentum increases.