【摘要】 系统分析了A≈ 170区正常形变带 [5 2 1]1/ 2 - 中的ΔI =1颤动现象 .根据旋称伙伴带的跃迁能量提取Δ2 Eγ(I) =[Eγ(I) +Eγ(I- 2 ) ]/ 2 -Eγ(I - 1)值 ,表现出旋称相关的规则上下颤动 .其颤动幅度在低自旋端约为 5 0keV ,而后随自旋而增大或减小 ,大体呈抛物线形 .利用改进的ab公式 ,提取了相关的脱耦合系数 .运用Nilsson波函数 ,探讨了原子核集体哈密顿量中高阶微扰项的可能形式 .更多还原

【Abstract】 The ΔI=1 staggering phenomenon has been investigated systematically for the normally deformed bands in the odd-A rare-earth nuclei. By extracting the values of Δ 2 E γ(I)=[E γ(I)+E γ(I-2)]/2-E γ(I-1) from the transition energies in a pair of signature partner bands, regular signature- and spin-dependent zigzag patterns are explored in a series of the neutron ↓ bands. The staggering amplitude varies with spin roughly as a parabola-like curve, the same as the behavior observed in the odd mass superdeformed nuclei. However, an appreciably non-vanishing amplitude is expected due to the decoupling effect in the ↓bands, which is different from the cases of the superdeformed bands. The decoupling terms are parametrised by the modified ab-fitting. Attempt is made to calculate the decoupling parameters (beyond the decoupling canstant) by taking into account the possible higher-order perturbation in the collective model hamiltonian.更多还原