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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On leave from Argonne National Laboratory, Argonne, IL 60439, USA
We wish to thank the staff of the UNILAC and H. Folger for delivering excellent beams and targets for the experiment. Stimulating discussions with M. Diebel, J. Dudek, T. Dóssing, S. Frauendorf and S. Åberg are gratefully acknowledged. This work has been supported by the Danish National Science Research Council and by the Office of Nuclear Science, U.S. Department of Energy.
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Pedersen, J., Back, B.B., Bjørnholm, S. et al. High-spin isomers in W and Os nuclei; Competition betweenK-quantization and triaxiality. Z Physik A 321, 567–575 (1985). https://doi.org/10.1007/BF01432431
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DOI: https://doi.org/10.1007/BF01432431