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

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  • Nick Bree
  • Kasia Wrzosek-Lipska
  • Andrew Petts
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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.


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


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

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