Shape Coexistence in the Neutron-Deficient Even-Even $^{182-188}$Hg 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 Hg...

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Detalles Bibliográficos
Autores principales: 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, J  E, Geibel, K, Gernhäuser, R, Grahn, T, Guttormsen, M, Hadinia, B, Hadyńska-Kle¸k, 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
Lenguaje:eng
Publicado: 2014
Materias:
Nuclear Physics
Nuclear Physics - Experiment
Acceso en línea:https://dx.doi.org/10.1103/PhysRevLett.112.162701
http://cds.cern.ch/record/2135836
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 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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