Low-energy Coulomb excitation of Sr-96,Sr-98 beams

Low-energy Coulomb excitation of Sr-96,Sr-98 beams

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 ex...

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Veröffentlicht in:Physical Review C 2016-11, Vol.94 (5)
Hauptverfasser: Clement, E, Zielinska, M, Peru, S, Goutte, H, Hilaire, S, Gorgen, A, Korten, W, Doherty, D.T, Bastin, B, Bauer, C, Blazhev, A, Bree, Nick, Bruyneel, B, Butler, P.A, Butterworth, J, Cederkall, J, Delahaye, P, Dijon, A, Ekstrom, A, Fitzpatrick, C, Fransen, C, Georgiev, G, Gernhauser, 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, Renstrom, T, Seidlitz, M, Siebeck, B, Siem, S, Sotty, C, Srebrny, J, Stefanescu, Irina, Tveten, G.M, Van de Walle, J, Vermeulen, M, Voulot, D, Warr, N, Wenander, F, Wiens, A, De Witte, Hilde, Wrzosek-Lipska, Kasia
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Sprache:eng
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Zusammenfassung: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.
ISSN:2469-9985