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First observation of excited states in 184Pb: spectroscopy beyond the neutron mid-shell

  • 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
Nuclear structure

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.

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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Copyright information

© Springer-Verlag Berlin Heidelberg 1998

Authors and Affiliations

  • J.F.C. Cocks
    • 1
  • M. Muikku
    • 1
  • W. Korten
    • 2
  • R. Wadsworth
    • 3
  • S. Chmel
    • 4
  • J. Domscheit
    • 4
  • P.T. Greenlees
    • 5
  • K. Helariutta
    • 1
  • I. Hibbert
    • 3
  • M. Houry
    • 2
  • D. Jenkins
    • 3
  • P. Jones
    • 1
  • R. Julin
    • 1
  • S. Juutinen
    • 1
  • H. Kankaanpää
    • 1
  • H. Kettunen
    • 1
  • P. Kuusiniemi
    • 1
  • M. Leino
    • 1
  • Y. Le Coz
    • 2
  • R. Lucas
    • 2
  • E. Mergel
    • 4
  • R.D. Page
    • 5
  • A. Savelius
    • 1
  • W. Trzaska
    • 1
  1. 1.Accelerator Laboratory, Department of Physics, University of Jyväskylä, 40351 Jyväskylä, FinlandFI
  2. 2.DAPNIA/SPhN CEA-Saclay, FranceFR
  3. 3.Department of Physics, University of York, Heslington, York YO1 5DD, United KingdomGB
  4. 4.Institut für Strahlen- und Kernphysik, Universität Bonn, D-53115 Bonn, GermanyDE
  5. 5.Oliver Lodge Laboratory, Department of Physics, University of Liverpool, Liverpool L69 7ZE, United KingdomGB

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