The ($N=88\text{-}108$) light mass Os isotopes exhibit level spectra different from the heavier (N > 108) isotopes. The spectral pattern, for ground, β- and γ- bands is illustrated empirically, and analyzed in terms of the collective rotation vibration model and the algebraic sd Interacting Boson Model IBM-1. The variation of the spectral features with neutron number N has been linked to the odd-A neighbors and to the occupation of the underlying Nilsson orbits. The quadrupole β vibration produces the axially symmetric shape of light mass Os isotopes, in contrast to the main role of the asymmetry parameter γ in the heavier Os isotopes. The energy level spectra, and the inter band $B(E2)$ ratios in IBM-1 reproduce the shape variation from spherical to the X(5) symmetry status, and to the prolate deformed rotor, as in experiment. This reveals the interesting physics of the rotation vibration model by high lighting the special features of the light mass ^164−184Os isotopes. The detailed band structure and their variation with neutron number N of the Os isotopes is presented empirically and in IBM-1.

这 （$氮=88\text{-}108$) 轻质量 Os 同位素表现出与较重 ( N > 108) 同位素不同的能级光谱。根据经验说明了地面、 β​​ 和γ波段的光谱图案，并根据集体旋转振动模型和代数 sd 相互作用玻色子模型 IBM-1 进行了分析。光谱特征随中子数N的变化与奇数A邻居以及对底层尼尔森轨道的占据有关。四极β振动产生轻质量Os同位素的轴对称形状，这与不对称参数γ的主要作用相反在较重的 Os 同位素中。能级谱和带间$乙（乙2）$IBM-1 中的比率再现了从球形到 X(5) 对称状态以及长形变形转子的形状变化，如实验中所示。^{这通过突出显示轻质量164−184} Os 同位素的特殊特征，揭示了旋转振动模型的有趣物理现象。详细的能带结构及其随 Os 同位素中子数N的变化在 IBM-1 中根据经验给出。