Abstract
High-spin states in186Os have been populated by the186W(4He,4n)-reaction at 55MeV. The emittedγ-radiation was detected with the OSIRIS spectrometer. The yrast band, for which the nucleus has a prolate shape, was found to terminate atI π=18+. Theγ-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.
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Communicated by B. Herskind
This work is supported financially in part by the Bulgarian Scientific Foundation under contract No.Φ106/2054.
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Balabanski, D.L., Hristov, D.H., Lieder, R.M. et al. Fragmentation of the yrast band in186Os atI π=18+ and disappearance of the collective minimum. Z. Physik A - Hadrons and Nuclei 356, 393–397 (1996). https://doi.org/10.1007/BF02769244
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DOI: https://doi.org/10.1007/BF02769244