Low-energy Coulomb excitation of $^{96,98}$Sr beams

The structure of neutron-rich $^{96,98}$Sr nuclei was investigated by low-energy safe Coulomb excitation of radioactive beams at the REX-ISOLDE facility, CERN, with the MINIBALL spectrometer. A rich set of transitional and diagonal E2 matrix elements, including those for non-yrast structures, has be...

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Detalles Bibliográficos
Autores principales: Clément, E, Zielińska, M, Péru, S, Goutte, H, Hilaire, S, Görgen, A, Korten, W, Doherty, D T, Bastin, B, Bauer, C, Blazhev, A, Bree, N, Bruyneel, B, Butler, P A, Butterworth, J, Cederkäll, J, Delahaye, P, Dijon, A, Ekström, A, Fitzpatrick, C, Fransen, C, Georgiev, G, Gernhäuser, R, Hess, H, Iwanicki, J, Jenkins, D G, Larsen, A C, Ljungvall, J, Lutter, R, Marley, P, Moschner, K, Napiorkowski, P J, Pakarinen, J, Petts, A, Reiter, P, Renstrøm, T, Seidlitz, M, Siebeck, B, Siem, S, Sotty, C, Srebrny, J, Stefanescu, I, Tveten, G M, Van de Walle, J, Vermeulen, M, Voulot, D, Warr, N, Wenander, F, Wiens, A, De Witte, H, Wrzosek-Lipska, K
Lenguaje:eng
Publicado: 2016
Materias:
Nuclear Physics - Experiment
Acceso en línea:https://dx.doi.org/10.1103/PhysRevC.94.054326
http://cds.cern.ch/record/2261134
Descripción
Sumario:The structure of neutron-rich $^{96,98}$Sr nuclei was investigated by low-energy safe Coulomb excitation of radioactive beams at the REX-ISOLDE facility, CERN, with the MINIBALL spectrometer. A rich set of transitional and diagonal E2 matrix elements, including those for non-yrast structures, has been extracted from the differential Coulomb-excitation cross sections. The results support the scenario of a shape transition at N=60, giving rise to the coexistence of a highly deformed prolate and a spherical configuration in $^{98}$Sr, and are compared to predictions from several theoretical calculations. The experimental data suggest a significant contribution of the triaxal degree of freedom in the ground state of both isotopes. In addition, experimental information on low-lying states in $^{98}$Rb has been obtained.

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