Shape coexistence in the neutron-deficient even-even 182−188Hg isotopes studied via Coulomb excitation

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...

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Autores: 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., Cederkäll, 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, José Enrique, 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.
Tipo de recurso: artículo
Fecha de publicación:2014
País:España
Institución:Universidad de Huelva (UHU)
Repositorio:Arias Montano. Repositorio Institucional de la Universidad de Huelva
Idioma:inglés
OAI Identifier:oai:ariasmontano.uhu.es:10272/7930
Acceso en línea:http://hdl.handle.net/10272/7930
Access Level:acceso abierto
Palabra clave:Hg isotopes
Shape coexistence
Isótopos
Descripción
Sumario: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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