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Author(s)
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Clément, E (GANIL ; CERN) ; Zielińska, M (IRFU, Saclay ; Warsaw U., Heavy Ion Lab) ; Péru, S (CEA DAM) ; Goutte, H (IRFU, Saclay) ; Hilaire, S (CEA DAM) ; Görgen, A (Oslo U.) ; Korten, W (IRFU, Saclay) ; Doherty, D T (IRFU, Saclay ; York U., England) ; Bastin, B (GANIL) ; Bauer, C (Darmstadt, Tech. U.) ; Blazhev, A (Cologne U.) ; Bree, N (KU Leuven, Dept. Phys. Astron.) ; Bruyneel, B (Cologne U.) ; Butler, P A (Liverpool U.) ; Butterworth, J (York U., England) ; Cederkäll, J (CERN ; Lund U.) ; Delahaye, P (GANIL ; CERN) ; Dijon, A (GANIL) ; Ekström, A (Lund U.) ; Fitzpatrick, C (Manchester U.) ; Fransen, C (Cologne U.) ; Georgiev, G (CSNSM, Orsay) ; Gernhäuser, R (Munich U.) ; Hess, H (Cologne U.) ; Iwanicki, J (Warsaw U., Heavy Ion Lab) ; Jenkins, D G (York U., England) ; Larsen, A C (Oslo U.) ; Ljungvall, J (CSNSM, Orsay) ; Lutter, R (Munich U.) ; Marley, P (York U., England) ; Moschner, K (Cologne U.) ; Napiorkowski, P J (Warsaw U., Heavy Ion Lab) ; Pakarinen, J (CERN) ; Petts, A (Liverpool U.) ; Reiter, P (Cologne U.) ; Renstrøm, T (Oslo U.) ; Seidlitz, M (Cologne U.) ; Siebeck, B (Cologne U.) ; Siem, S (Oslo U.) ; Sotty, C (CSNSM, Orsay) ; Srebrny, J (Warsaw U., Heavy Ion Lab) ; Stefanescu, I (KU Leuven, Dept. Phys. Astron.) ; Tveten, G M (CERN) ; Van de Walle, J (CERN) ; Vermeulen, M (York U., England) ; Voulot, D (CERN) ; Warr, N (Cologne U.) ; Wenander, F (CERN) ; Wiens, A (Cologne U.) ; De Witte, H (KU Leuven, Dept. Phys. Astron.) ; Wrzosek-Lipska, K (Warsaw U., Heavy Ion Lab) |
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Abstract
| 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. |