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Title Shape Coexistence in the Neutron-Deficient Even-Even $^{182-188}$Hg Isotopes Studied via Coulomb Excitation
Author(s) Bree, N (KU Leuven, Dept. Phys. Astron.) ; Wrzosek-Lipska, K (KU Leuven, Dept. Phys. Astron.) ; Petts, A (U. Liverpool (main)) ; Andreyev, A (KU Leuven, Dept. Phys. Astron.) ; Bastin, B (KU Leuven, Dept. Phys. Astron. ; GANIL) ; Bender, M (CENBG, Gradignan) ; Blazhev, A (Cologne U.) ; Bruyneel, B (Cologne U.) ; Butler, P  A (U. Liverpool (main)) ; Butterworth, J ; Carpenter, M  P ; Cederkäll, J (CERN) ; Clément, E (CERN ; GANIL) ; Cocolios, T  E (CERN) ; Deacon, A ; Diriken, J (KU Leuven, Dept. Phys. Astron.) ; Ekström, A ; Fitzpatrick, C ; Fraile, L  M (CERN) ; Fransen, Ch (Cologne U.) ; Freeman, S  J ; Gaffney, L  P (KU Leuven, Dept. Phys. Astron.) ; García-Ramos, J  E ; Geibel, K (Cologne U.) ; Gernhäuser, R ; Grahn, T ; Guttormsen, M ; Hadinia, B ; Hadyńska-Kle¸k, K (Warsaw U., Heavy Ion Lab) ; Hass, M ; Heenen, P -H ; Herzberg, R -D ; Hess, H ; Heyde, K ; Huyse, M (KU Leuven, Dept. Phys. Astron.) ; Ivanov, O (KU Leuven, Dept. Phys. Astron.) ; Jenkins, D  G ; Julin, R ; Kesteloot, N (KU Leuven, Dept. Phys. Astron.) ; Kröll, Th ; Krücken, R ; Larsen, A  C (Oslo U.) ; Lutter, R ; Marley, P ; Napiorkowski, P  J ; Orlandi, R (KU Leuven, Dept. Phys. Astron.) ; Page, R  D ; Pakarinen, J ; Patronis, N (KU Leuven, Dept. Phys. Astron.) ; Peura, P  J ; Piselli, E (CERN) ; Rahkila, P ; Rapisarda, E (CERN) ; Reiter, P ; Robinson, A  P ; Scheck, M ; Siem, S ; Singh Chakkal, K ; Smith, J  F ; Srebrny, J ; Stefanescu, I (KU Leuven, Dept. Phys. Astron.) ; Tveten, G  M ; Van Duppen, P (KU Leuven, Dept. Phys. Astron.) ; Van de Walle, J (CERN) ; Voulot, D (CERN) ; Warr, N ; Wenander, F (CERN) ; Wiens, A ; Wood, J  L ; Zielińska, M (IRFU, SPhN, Saclay)
Publication 2014
Number of pages 5
In: Phys. Rev. Lett. 112 (2014) 162701
DOI 10.1103/PhysRevLett.112.162701
Subject category Nuclear Physics ; Nuclear Physics - Experiment
Accelerator/Facility, Experiment CERN ISOLDE
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 Hg182-188 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 0+ state was noted in Hg182,184. 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.
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