Spectroscopic Quadrupole Moments in Sr 96,98: Evidence for Shape Coexistence in Neutron-Rich Strontium Isotopes at N=60

E. Clément, M. Zielińska, A. Görgen, W. Korten, S. Péru, J. Libert, H. Goutte, S. Hilaire, B. Bastin, C. Bauer, A. Blazhev, N. Bree, B. Bruyneel, P. A. Butler, J. Butterworth, P. Delahaye, A. Dijon, D. T. Doherty, A. Ekström, C. FitzpatrickC. Fransen, G. Georgiev, R. Gernhäuser, H. Hess, J. Iwanicki, D. G. Jenkins, A. C. Larsen, J. Ljungvall, R. Lutter, P. Marley, K. Moschner, P. J. Napiorkowski, J. Pakarinen, A. Petts, P. Reiter, T. Renstrøm, M. Seidlitz, B. Siebeck, S. Siem, C. Sotty, J. Srebrny, I. Stefanescu, G. M. Tveten, J. Van De Walle, M. Vermeulen, D. Voulot, N. Warr, F. Wenander, A. Wiens, H. De Witte, K. Wrzosek-Lipska

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Abstract

Neutron-rich Sr96,98 isotopes have been investigated by safe Coulomb excitation of radioactive beams at the REX-ISOLDE facility. Reduced transition probabilities and spectroscopic quadrupole moments have been extracted from the differential Coulomb excitation cross sections. These results allow, for the first time, the drawing of definite conclusions about the shape coexistence of highly deformed prolate and spherical configurations. In particular, a very small mixing between the coexisting states is observed, contrary to other mass regions where strong mixing is present. Experimental results have been compared to beyond-mean-field calculations using the Gogny D1S interaction in a five-dimensional collective Hamiltonian formalism, which reproduce the shape change at N=60.

Original languageEnglish
Article number022701
Number of pages6
JournalPhysical Review Letters
Volume116
Issue number2
DOIs
Publication statusPublished - 15 Jan 2016

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