摘要:
基于(β2,γ,β4)形变空间下对-形变自洽的原子核能量面计算方法,系统研究分析了50<Z<82区偶偶核的形状及硬度演化特征.计算的平衡形变与其它理论预言及存在的实验值进行了对比.从相应的形变势能曲线提取了与β2及γ相关的硬度参数Cβ,Cγ,这与实验观测到的低位β及γ振动带信息相符.还简要讨论了转动情况下的硬度演化,例如基于蜈蚣型E-GOS曲线,表明存在不可忽略的振动效应.
Abstract:
Nuclear shape and stiffness evolutions in even-even nuclei with 50 < Z < 82 are systematically analyzed in terms of the pairing-deformation self-consistent nuclear-energy-surface calculation in (β2,γ,β4)deformation space.Calculated equilibrium deformations are presented and compared with other theoretical predictions and available experimental data.The stiffness parameters Cβ and Cγ respectively related to quadrupole deformationsβ2 and γ are determined from the deformation energy curves,which are consistent with the observed low-lying β and/or γ bands.The stiffness evolution under rotation along the yrast line is briefly discussed,e.g.,on the basis of the centipidelike E-GOS curves,showing an unnegligible vibration effect.