钇同位素中的组态交叉、形状演化及奇质子极化
Configuration crossing, shape evolution, and odd-proton polarization in yttrium isotopes
中文总结 AI 辅助
本研究针对$^\text{91-101}$Y同位素，采用组态混合玻色-费米方法，探究奇质子引发的组态交叉与形状演化，引入差分电荷半径极化可观测量揭示临界区域核芯演化的局域化修改，相关结果得到多类观测数据支持。
中文摘要 AI 辅助
奇质量数的$^\text{91-101}$Y同位素为研究未配对质子如何引发集体结构的突变式演化提供了测试平台。组态混合玻色-费米描述表明，最低负宇称与正宇称态在中子数$N=60$附近会发生正常组态与侵入组态的交叉，伴随从准粒子与近球形核芯的弱耦合向与形变核芯的强耦合的演化。为分离奇质子的作用，引入差分电荷半径极化可观测量，定义为奇质量链的同位素位移与对应偶-偶核芯同位素位移的差值。该量在$N=58$处出现明显峰值，在$N=60$处发生符号反转，揭示了临界区域内核芯演化的局域化修改。能级、波函数成分、电磁矩、双中子分离能及相干态势能面均支持该结论。
英文摘要
The odd-mass $^\text{91-101}$Y isotopes provide a testing ground for how an unpaired proton modifies an abrupt collective structural evolution. A configuration-mixing Bose-Fermi description shows that the lowest negative- and positive-parity states undergo a crossing of normal and intruder configurations near neutron number $N = 60$, intertwined with an evolution from weak coupling of a quasiparticle to a near-spherical core toward strong coupling to a deformed core. To isolate the role of the odd proton, a differential charge-radius polarization observable is introduced as the difference between the isotope shifts of the odd-mass chain with those of the corresponding even-even cores. Its pronounced peak at $N = 58$ and sign reversal at $N = 60$ reveal a localized modification of the core evolution in the critical region. Energy levels, wave-function content, electromagnetic moments, two-neutron separation energies, and coherent-state energy surfaces support this interpretation.
