For the first time, a systematic study of identical superdeformed (SD) bands in A ∼ 150, 130 mass region is made, where ΔI = 4 bifurcation is present. Four pairs of identical SD bands viz. {149Gd(1),148Gd(6)} and {149Gd(1),148Eu(1)} of A ∼ 150 mass region and {132Ce(1),133Ce(1)} and {133Ce(2),136Nd(1)} of A ∼ 130 mass region have been systematically studied. The present systematic study provides the universal description of the identical SD bands in various mass regions. We presented the empirical evidence of a similar structure of identical SD bands in various mass regions. For this purpose, we have used various rotational energy formulae. The free parameters are extracted from four identical SD bands. The ΔI = 4 bifurcation in identical SD bands is calculated from shape fluctuation formulae. For the first time, this shape fluctuation model is employed to calculate the ΔI = 4 bifurcation, making it an alternate powerful tool to study SD bands of various mass regions.

中文翻译：

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ΔI = 4 分叉和相同超变形带的现象学分析

首次对相同的超变形（SD）带进行了系统研究一种 ～ 150, 130质量区域被制成，其中Δ一世 = 4存在分叉。四对相同的 SD 波段即。{149钆(1),148钆(6)}和{149钆(1),148欧盟(1)}的一种 ～ 150大众区域和{132铈(1),133铈(1)}和{133铈(2),136钕(1)}的一种 ～ 130质量区域进行了系统研究。本系统研究提供了对不同质量区域中相同 SD 波段的通用描述。我们提供了在不同质量区域中相同 SD 带的类似结构的经验证据。为此，我们使用了各种旋转能量公式。自由参数是从四个相同的 SD 波段中提取的。这Δ一世 = 4根据形状波动公式计算相同 SD 波段中的分岔。首次采用这种形状波动模型计算Δ一世 = 4分岔，使其成为研究各种质量区域的 SD 波段的替代强大工具。