Abstract:
Excited states have been identified for the first time in 184Pb, the first even-even Pb isotope beyond the 82 < N < 126 mid-shell, using the recoil-decay tagging (RDT) technique. A collective band built on the first-excited 2+ state has been observed. This resembles those seen in 186,188Pb and the Hg isotones, and can thus be associated with a prolate-deformed shape. Variable moment of inertia (VMI) fits of the prolate 0+ level energies in 184,186,188Pb indicate that the minimum appears at N= 103, the same neutron number at which the corresponding minimum in Hg isotopes is observed.
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Received: 19 May 1998 / Revised version: 1 July 1998
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Cocks, J., Muikku, M., Korten, W. et al. First observation of excited states in 184Pb: spectroscopy beyond the neutron mid-shell . EPJ A 3, 17–20 (1998). https://doi.org/10.1007/s100500050144
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DOI: https://doi.org/10.1007/s100500050144