Low-energy Coulomb excitation of 96,98Sr 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 𝐸⁢2 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.

Authors: E. Clément, M. Zielińska, S. Péru, H. Goutte, S. Hilaire, A. Görgen, W. Korten, D. T. Doherty, B. Bastin, C. Bauer, A. Blazhev, N. Bree, B. Bruyneel, P. A. Butler, J. Butterworth, J. Cederkäll, P. Delahaye, A. Dijon, A. Ekström, C. Fitzpatrick, C. 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 and K. Wrzosek-Lipska

Doi: 10.1103/PhysRevC.94.054326

Issue number:

Journal: Phys. Rev. C

Page number: 054326

Published on: 2016-11-28

Year: