Gamma-Ray Spectroscopy of 166Er

Relative intensities of gamma rays of 166 Er from the decays of 166m Ho were precisely measured with a calibrated Ge(Li) detector. Errors of relative gamma-ray intensities are about 0.5% for strong gamma rays. Angular correlations for 11 cascades were measured with Ge(Li) and NaI(T1) detectors. The B (E2) ratios were deduced from the relative gamma-ray intensities and the adopted values of the M1 components. These ratios were satisfactorily explained by means of the band mixing treatment between the ground-state band and the gamma-vibrational band.