Fragmentation of the yrast band in186Os at I π =18+ and disappearance of the collective minimum
Abstract
High-spin states in186Os have been populated by the186W(4He,4n)-reaction at 55MeV. The emitted γ-radiation was detected with the OSIRIS spectrometer. The yrast band, for which the nucleus has a prolate shape, was found to terminate at I π =18+. The γ-ray intensity is then distributed between several irregular sequences. Different to other cases of band termination, the minimum in the total routhian surface corresponding to a collective shape is calculated to disappear in this spin region, although the available spin of the valence nucleons is far from being exhausted. A different structure, which is dominated by non-collective states becomes yrast.
- Publication:
-
Zeitschrift fur Physik A Hadrons and Nuclei
- Pub Date:
- December 1996
- DOI:
- 10.1007/BF02769244
- Bibcode:
- 1996ZPhyA.356..393B
- Keywords:
-
- 23.20.En;
- 23.20.Lv;
- 27.70.+q;
- 21.60.Ev