Shape Coexistence in the Neutron-Deficient Even-Even 182−188Hg Isotopes Studied via Coulomb Excitation

Research output: Contribution to journalArticle

Authors

  • Nick Bree
  • Kasia Wrzosek-Lipska
  • Andrew Petts
  • Andrei Andreyev
  • Beyhan Bastin
  • Michael Bender
  • A Blazhev
  • Bart Bruyneel
  • Peter A Butler
  • J Butterworth
  • MP Carpenter
  • Joachim Cederkäll
  • Emanuel Clément
  • Thomas Elias Cocolios
  • A Deacon
  • Jan Diriken
  • A Ekström
  • C Fitzpatrick
  • LM Fraile
  • CH Fransen
  • SJ Freeman
  • Liam Paul Gaffney
  • JE Garcia-Ramos
  • K Geibel
  • R Gernhäuser
  • Tuomas Grahn
  • M Guttormsen
  • B Hadinia
  • K Hadynska-Klek
  • M Hass
  • Paul-Henri Heenen
  • R-D Herzberg
  • H Hess
  • Kris Heyde
  • Mark Huyse
  • Oleg Ivanov
  • DG Jenkins
  • R Julin
  • Thorsten Kröll
  • R Krücken
  • AC Larsen
  • R Lutter
  • P Marley
  • PJ Napiorkowski
  • Riccardo Orlandi
  • RD Page
  • Janne Pakarinen
  • Nikolas Patronis
  • PJ Peura
  • E Piselli
  • P Rahkila
  • Elisa Rapisarda
  • Peter Reiter
  • AP Robinson
  • Marcus Scheck
  • S Siem
  • K Singh Chakkal
  • JF Smith
  • J Srebrny
  • Irina Stefanescu
  • GM Tveten
  • Piet Van Duppen
  • Jarno Van de Walle
  • Didier Voulot
  • Nigel Warr
  • F Wenander
  • A Wiens
  • John L Wood
  • Magda Zielinska

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Abstract

Coulomb-excitation experiments to study electromagnetic properties of radioactive even-even Hg isotopes were performed with 2.85 MeV=nucleon mercury beams from REX-ISOLDE. Magnitudes and relative signs of the reduced E2 matrix elements that couple the ground state and low-lying excited states in 182−188Hg were extracted. Information on the deformation of the ground and the first excited 0+ states was deduced using the quadrupole sum rules approach. Results show that the ground state is slightly deformed and of oblate nature, while a larger deformation for the excited 0þ state was noted in 182;184Hg. The results are compared to beyond mean field and interacting-boson based models and interpreted within a two-state mixing model. Partial agreement with the model calculations was obtained. The presence of two different structures in the light even-mass mercury isotopes that coexist at low excitation energy is firmly established.

Details

Original languageEnglish
Pages (from-to)1-5
JournalPhysical review Letters
Volume112
Issue number162701
DOIs
Publication statusPublished - 25 Apr 2014

Keywords

  • Coulomb excitation, Hg, REX-ISOLDE, CERN, Miniball, shape coexistence

ID: 330677