Electromagnetic properties of low-lying states in neutron-deficient Hg isotopes: Coulomb excitation of 182Hg, 184Hg, 186Hg and 188Hg

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The neutron-deficient mercury isotopes serve as a classical example of shape coexistence, whereby at low energy near-degenerate nuclear states characterized by different shapes appear. The electromagnetic structure of even-mass 182-188 Hg isotopes was studied using safe-energy Coulomb excitation of neutron-deficient mercury beams delivered by the REX-ISOLDE facility at CERN. The population of 01,2+, 21,2+ and 41+ states was observed in all nuclei under study. Reduced E2 matrix elements coupling populated yrast and non-yrast states were extracted, including their relative signs. These are a sensitive probe of shape coexistence and may be used to validate nuclear models. The experimental results are discussed in terms of mixing of two different configurations and are compared with three different model calculations: the Beyond Mean Field model, the Interacting Boson Model with configuration mixing and the General Bohr Hamiltonian. Partial agreement with experiment was observed, hinting to missing ingredients in the theoretical descriptions.


  • K. Wrzosek-Lipska
  • K. Rezynkina
  • N. Bree
  • M. Zielińska
  • L. P. Gaffney
  • A. Petts
  • A. Andreyev
  • B. Bastin
  • M. Bender
  • A. Blazhev
  • B. Bruyneel
  • P. A. Butler
  • M. P. Carpenter
  • E. Clément
  • T. E. Cocolios
  • A. N. Deacon
  • J. Diriken
  • A. Ekström
  • C. Fitzpatrick
  • L. M. Fraile
  • Ch Fransen
  • S. J. Freeman
  • J. E. García-Ramos
  • K. Geibel
  • R. Gernhäuser
  • T. Grahn
  • M. Guttormsen
  • B. Hadinia
  • K. Hadyńska-Klȩk
  • M. Hass
  • P. H. Heenen
  • R. D. Herzberg
  • H. Hess
  • K. Heyde
  • M. Huyse
  • O. Ivanov
  • D. G. Jenkins
  • R. Julin
  • N. Kesteloot
  • Th Kröll
  • R. Krücken
  • A. C. Larsen
  • R. Lutter
  • P. Marley
  • P. J. Napiorkowski
  • R. Orlandi
  • R. D. Page
  • J. Pakarinen
  • N. Patronis
  • P. J. Peura
  • E. Piselli
  • L. Próchniak
  • P. Rahkila
  • E. Rapisarda
  • P. Reiter
  • A. P. Robinson
  • M. Scheck
  • S. Siem
  • K. Singh Chakkal
  • J. F. Smith
  • J. Srebrny
  • I. Stefanescu
  • G. M. Tveten
  • P. Van Duppen
  • J. Van de Walle
  • D. Voulot
  • N. Warr
  • A. Wiens
  • J. L. Wood
External organisations
  • University of Warsaw
  • Catholic University of Leuven
  • University of Strasbourg
  • University of Paris-Saclay
  • University of Liverpool
  • CERN
  • University of the West of Scotland
  • University of York
  • GANIL Grand Accelerateur National d'Ions Lourds
  • Université Claude Bernard
  • University of Cologne
  • Argonne National Laboratory
  • University of Manchester
  • Belgian Nuclear Research Centre
  • Complutense University of Madrid
  • University of Huelva
  • Technical University of Munich
  • University of Jyväskylä
  • University of Helsinki
  • University of Oslo
  • University of Guelph
  • Weizmann Institute of Science Israel
  • Free University of Brussels (ULB)
  • Ghent University
  • Technical University of Darmstadt
  • Ludwig-Maximilian University of Munich
  • University of Ioannina
  • Paul Scherrer Institute
  • National Physical Laboratory
  • Georgia Institute of Technology
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Subatomic Physics
Original languageEnglish
Article number130
JournalEuropean Physical Journal A
Issue number8
Publication statusPublished - 2019 Aug 1
Publication categoryResearch