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High-spin isomers in W and Os nuclei; Competition betweenK-quantization and triaxiality |
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| Authors: | J Pedersen B B Back S Bjørnholm J Borggreen G Sletten F Azgui H Emling H Grein G Seiler-Clark W Spreng H J Wollersheim P Walker |
| Institution: | 1. The Niels Bohr Institute, Roskilde, Denmark 2. Gesellschaft für Schwerionenforschung, Darmstadt, Germany 3. Nuclear Structure Facility, Daresbury, UK |
| Abstract: | Results of a search for high-spin isomers in W and Os nuclei withN=104–107 are presented. Targets of48Ca and48, 50Ti are bombarded with a pulsed136Xe beam, and delayed gamma-radiation is detected by an array of NaI- and Ge-detectors. Several new isomers, with spin values up to ～22h, are found in178,180W and180, 182, 183Os. Markedly different decay patterns and hindrance factors are found in the Os isotopes as compared to the expectations based on theK-selection rule valid for axially symmetric nuclei. The findings are ascribed to the onset of triaxial distortions. |
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