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Isomeric decay studies using a recoil mass separator

Authors:	J. H. McNeill A. A. Chishti P. J. Daly W. Gelletly M. A. C. Hotchkis M. Piiparinen B. J. Varley P. J. Woods J. Blomqvist

Affiliation:	1. Department of Physics, University of Manchester, M13 9PL, Manchester, UK 2. Oak Ridge National Laboratory and Joint Institute of Heavy-Ion Research, 37831, Oak Ridge, TN, USA 3. Department of Chemistry, Purdue University, 47907, West Lafayette, IN, USA 4. SERC-Daresbury Laboratory, WA44AD, Warrington, Cheshire, UK 5. Department of Physics, Jyv?skyl? University, SF-40100, Jyv?skyl?, Finland 6. Department of Physics, University of Edinburgh, EH9 3JZ, Edinburgh, UK 7. Manne Siegbahn Institute of Physics, S-10405, Stockholm, Sweden

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 ₁₁ ^2/n andπh ₁₁ ^2/n vf_7/2 states, are characterized. The reduced E2 transition rates indicate that half-filling of theπh_11/2 subshell occurs just belowZ=71, and results for theN=83 odd-odd isotones are also consistent with this finding.

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