Abstract
Microsecond isomers in the exotic proton-richN=82, 83 nuclei153Yb,153Lu,154Lu and154Hf have been identified byγ-ray spectroscopy following mass analysis of102Pd+245 MeV54Fe reaction products using the Daresbury Recoil Separator. The decays of the isomers, interpreted asπh 2/n11 andπh 2/n11 vf7/2 states, are characterized. The reduced E2 transition rates indicate that half-filling of theπh11/2 subshell occurs just belowZ=71, and results for theN=83 odd-odd isotones are also consistent with this finding.
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We thank R. Broda and C.J. Lister for useful discussions. This work was funded by the U.K. Science and Engineering Research Council. P.J. Daly and M. Piiparinen acknowledge support from the U.S. Department of Energy and the Academy of Finland, respectively.
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McNeill, J.H., Chishti, A.A., Daly, P.J. et al. Isomeric decay studies using a recoil mass separator. Z. Physik A - Hadrons and Nuclei 344, 369–379 (1993). https://doi.org/10.1007/BF01283192
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DOI: https://doi.org/10.1007/BF01283192