摘要: 利用严格求解的Nilsson轴形变平均场加扩展对力模型，对Er和Yb同位素链基态形状（量子相）酷越进行了研究。通过该模型下能级比R_02⁺/21⁺、奇偶能差、信息熵的计算，成功地再现了^155-163Er和^157-165Yb同位素相关物理量的形状（量子相）酷越行为。通过分析这些量随着四极形变参数和总体对力强度的变化过程，显示了这种酷越行为主要是由于对力强度与四极形变之间的竞争导致的，该结果揭示了本模型下的基态形状（量子相）酷越行为的来源。


Ground-state shape (phase) crossover in Er and Yb isotopes is manifested in the axially deformed Nilsson mean-field plus extended pairing model. The energy ratio R_02⁺/21⁺, the odd-even mass differences and the information entropy are calculated under the present model, reproduce the shape (phase) crossover behaviors of these quantities in ^155-163Er and ^157-165Yb isotopes. From the analysis of these quantities as functions of the quadrupole deformation parameter and the overall pairing interaction strength, it is shown that the crossover is mainly driven by the competition between the pairing interaction and the quadrupole deformation, which thus provides the origin of the shape (phase) crossover in the present model.