Shape Coexistence in the Neutron- Deficient Even-Even Hg182-188 Isotopes Studied via Coulomb Excitation

N. Bree, K. Wrzosek-Lipska*, A. Petts, A. Andreyev, B. Bastin, M. Bender, A. Blazhev, B. Bruyneel, P. A. Butler, J. Butterworth, M. P. Carpenter, J. Cederkaell, E. Clement, T. E. Cocolios, A. Deacon, J. Diriken, A. Ekstroem, C. Fitzpatrick, L. M. Fraile, Ch. FransenS. J. Freeman, L. P. Gaffney, J. E. Garcia-Ramos, K. Geibel, R. Gernhaeuser, T. Grahn, M. Guttormsen, B. Hadinia, K. Hadynska-Klek, 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, 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, F. Wenander, A. Wiens, J. L. Wood, M. Zielinska

*Corresponding author for this work

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85 Citations (Scopus)


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.
Original languageEnglish
Article number162701
JournalPhysical Review Letters
Issue number16
Publication statusPublished - 23 Apr 2014


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