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

Nele Kesteloot, 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 FraileCH 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, Lucia Popescu

    Research outputpeer-review


    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
    StatePublished - 25 Apr 2014

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