Shape coexistence in the neutron-deficient even-even 182−188Hg isotopes studied via Coulomb excitation
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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 0+
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.
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Bibliographic citation
Bree, N., Wrzosek-Lipska, K., Petts, A., Andreyev, A., Bastin, B., Bender, M., Blazhev, A., Bruyneel, B., Butler, P. A., Butterworth, J., Carpenter, M. P., Cederk¨all, J., Clément, E., Cocolios, T. E., Deacon, A., Diriken, J., Ekström, A., Fitzpatrick, C., Fraile, L. M., Fransen, Ch., Freeman, S. J., Gaffney, L. P., García Ramos, J. E., Geibel, K., Gernhäuser, R., Grahn, T., Guttormsen, M., Hadinia, B., Hadyńska-Klęk, K., Hass, M., Heenen, P.-H., Herzberg, R.-D., Hess, H., Heyde, K., Huyse, M., Ivanov, O., Jenkins, D. G., Julin, R., Kesteloot, N., Kröll, Th., Krücken, R., Larsen, A. C., Lutter, R., Marley, P., Napiorkowski, P. J., Orlandi, R., Page, R. D.,,Pakarinen, J., Patronis, N., Peura, P. J., Piselli, E., Rahkila, P., Rapisarda, E., Reiter, P., Robinson, A. P., Scheck, M., Siem, S., Singh Chakkal, K., Smith, J. F., Srebrny, J., Stefanescu, I., Tveten, G. M., Van Duppen, P., Van de Walle, J., Voulot, D., Warr, N., Wenander, F., Wiens, A., Wood, J. L., Zielińska, M.: "Shape coexistence in the neutron-deficient even-even 182−188Hg isotopes studied via Coulomb excitation". Physical Review Letters. Vol. 112, 162701, (2014). DOI: /10.1103/PhysRevLett.112.162701
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