Low-energy Coulomb excitation of $^{96,98}$Sr beams

Abstract : 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.
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E. Clément, M. Zielinska, S. Péru, H. Goutte, S. Hilaire, et al.. Low-energy Coulomb excitation of $^{96,98}$Sr beams. Physical Review C, American Physical Society, 2016, 94 (5), pp.054326. ⟨10.1103/PhysRevC.94.054326⟩. ⟨in2p3-01404614⟩

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