Decay of 189Re

The level scheme of 189 Os has been studied from β decay of 189 Re. Gamma-ray spectra, conversion electron spectra, and β-γ and γ-γ coincidence spectra were obtained by using high resolution detectors. A total of 66 γ transitions observed were assigned to 17 excited states of 189 Os. Most level properties are explained by the Nilsson model. Some low-lying 5/2 - and 7/2 - levels are discussed in terms of the triaxial rotor-plus-particle model.