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First observation of excited states in 184Pb: spectroscopy beyond the neutron mid-shell |
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| Authors: | J.F.C. Cocks M. Muikku W. Korten R. Wadsworth S. Chmel J. Domscheit P.T. Greenlees K. Helariutta I. Hibbert M. Houry D. Jenkins P. Jones R. Julin S. Juutinen H. Kankaanpää H. Kettunen P. Kuusiniemi M. Leino Y. Le Coz R. Lucas E. Mergel R.D. Page A. Savelius W. Trzaska |
| Affiliation: | Accelerator Laboratory, Department of Physics, University of Jyv?skyl?, 40351 Jyv?skyl?, Finland, FI DAPNIA/SPhN CEA-Saclay, France, FR Department of Physics, University of York, Heslington, York YO1 5DD, United Kingdom, GB Institut für Strahlen- und Kernphysik, Universit?t Bonn, D-53115 Bonn, Germany, DE Oliver Lodge Laboratory, Department of Physics, University of Liverpool, Liverpool L69 7ZE, United Kingdom, GB |
| 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. Received: 19 May 1998 / Revised version: 1 July 1998 |
| Keywords: | PACS:21.60.Ev Collective models – 23.20.-g Electromagnetic transitions – 25.70.gh Compound nucleus – 23.60.+e α decay |
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