Low-energy Coulomb excitation of 96,98Sr beams

Phys. Rev. C

94
054326
(2016)
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

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.

DOI
10.1103/PhysRevC.94.054326
Published on
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