Excitation energies of levels in the 3d94s configuration for W46+ from different theoretical approaches compared to experiment and other calculations

Table 1. Excitation energies of levels in the 3d94s configuration for W46+ from different theoretical approaches compared to experiment and other calculations. Abstract Based on the multi-configuration Dirac–Hartree–Fock method and using the GRASPVU package, a theoretical investigation was performed to study the lifetimes of hyperfine levels of the first excited level 3d94s 3D3 in Ni-like ions (Z = 72–79) for all stable isotopes with nuclear spin. Comparisons between hyperfine-induced electric quadrupole transition rates and the pure magnetic octupole transition rates show that the extra electric quadrupole transition channel caused by the nuclear magnetic dipole and electric quadrupole hyperfine interaction is important for most hyperfine levels in each individual ion. Lifetimes of most hyperfine levels are sensitive to this extra decay channel. Extreme cases are found in 181Ta, 185Re and 187Re, where lifetimes of some hyperfine levels are shortened by more than an order of magnitude.

表 1. W46+ 离子 3d94s 配置中能级激发能的实验值与其他理论计算值的比较。摘要：基于多配置狄拉克-哈特里-福克方法，并利用 GRASPVU 软件包，对镍类离子（Z = 72–79）所有稳定同位素中，一重激发态 3d94s 3D3 超精细能级的寿命进行了理论研究。通过比较超精细诱导的电四极跃迁速率与纯磁三重轴跃迁速率，发现由核磁偶极与电四极超精细相互作用引起的额外电四极跃迁通道对大多数单个离子的超精细能级至关重要。大多数超精细能级的寿命对此额外衰变通道敏感。在 181Ta、185Re 和 187Re 等极端情况下，某些超精细能级的寿命缩短了一个数量级以上。