Abstract
The level scheme of 177 Lu following the β-decay of 177 Yb ( T 1/2 =1.9 h) has been constructed from results of γ singles and γ-γ coincidence measurements. Angular correlations of γ-rays were measured with a 4-Ge detector system. Mixing ratios (E2/M1) of seven γ-rays were obtained. The spins and parities of the 1049.4, 1150.0 and 1241.7 keV levels have been assigned to be 9/2 - , 7/2 + and 7/2 + , respectively. These assignments for the 1049.4 and 1241.7 keV levels are consistent with the interpretation that these levels are members of three-quasiparticle multiplets. Energy splittings of three-quasiparticle states were calculated. The calculated 1160 keV 7/2 + level may correspond to the observed 1150.0 keV 7/2 + level. A calculation with a rotation-vibration coupling model was performed. The K -2 γ-vibrational state of the 7/2 + [404] state and the K ±2 γ-vibrational states of the 9/2 - [514] state are expected to exist near 1300 keV.
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