The W 187decay scheme and possible vibrational levels in an odd-mass nucleus

Abstract

The transitions and levels of Re 187populated by W 187β − decay have been investigated with a bent crystal spectrometer, an iron-free homogeneous-field spectrometer, an iron-free 180°-focusing spectrometer and a fast-slow coincidence angular-correlation unit. There have been observed 17 transitions, which are interpreted to establish 8 excited levels in Re 187. An analysis of the levels in terms of the Nilsson description shows that certain definite discrepancies exist between the theoretically expected level order and that observed. It is therefore suggested that 2 of the levels observed may correspond to the coupling of single particle states to gamma vibrations.