Low-energy Coulomb excitation of 96,98Sr beams

• Published in: Physical review. C, Nuclear physics Nuclear physics, 2016-11
• Main Authors: Clement, E, Zielinska, Magdalena, Péru, Sophie, Goutte, Héloïse, Hilaire, Stephane, Görgen, Andreas, Korten, Wolfram, Doherty, Daniel T, Bastin, Beyhan, Bauer, C, Blazhev, A, Bree, N, Bruyneel, Bart, Butler, Peter A, Butterworth, J, Cederkall, Joakim, Delahaye, P, Dijon, Aurore, Ekstrom, A, Fitzpatrick, C, Fransen, C, Georgiev, Georgi, Gernhauser, Roman, Hess, H, Iwanicki, J, Jenkins, David G, Larsen, Ann-Cecilie, Ljungvall, Joa, Lutter, R, Marley, P, Moschner, K, Napiorkowski, P. J, Pakarinen, J, Petts, A, Reiter, Peter, Renstrøm, Therese, Seidlitz, M, Siebeck, B, Siem, Sunniva, Sotty, Christophe, Srebrny, Julian, Stefanescu, I, Tveten, Gry Merete, Van de Walle, Jarno, Vermeulen, M, Voulot, Didier, Warr, Nigel, Wenander, Fredrik, Wiens, Andreas, De Witte, H, Wrzosek, K
• Format: Article
• Language: eng ; nor
• ISSN: 0556-2813; 1089-490X
• DOI: 10.1103/PhysRevC.94.054326

The structure of neutron-rich 96,98Sr 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 98Sr, 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 98Rb has been obtained.