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

Clement, E; Zielinska, M; Peru, S; Goutte, H; Hilaire, S; Gorgen, A; Korten, W; Doherty, DT; Bastin, B; Bauer, C; Blazhev, A; Bree, Nick; Bruyneel, B; Butler, PA; Butterworth, J; Cederkall, J; Delahaye, P; Dijon, A; Ekstrom, A; Fitzpatrick, C; Fransen, C; Georgiev, G; Gernhauser, R; Hess, H; Iwanicki, J; Jenkins, DG; Larsen, AC; Ljungvall, J; Lutter, R; Marley, P; Moschner, K; Napiorkowski, PJ; Pakarinen, J; Petts, A; Reiter, P; Renstrom, T; Seidlitz, M; Siebeck, B; Siem, S; Sotty, C; Srebrny, J; Stefanescu, Irina; Tveten, GM; Van de Walle, J; Vermeulen, M; Voulot, D; Warr, N; Wenander, F; Wiens, A; De Witte, Hilde; Wrzosek-Lipska, Kasia

doi:10.1103/PhysRevC.94.054326

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

Author:

Clement, E

Zielinska, M ; Peru, S ; Goutte, H ; Hilaire, S ; Gorgen, A ; Korten, W ; Doherty, DT ; Bastin, B ; Bauer, C ; Blazhev, A ; Bree, Nick ; Bruyneel, B ; Butler, PA ; Butterworth, J ; Cederkall, J ; Delahaye, P ; Dijon, A ; Ekstrom, A ; Fitzpatrick, C ; Fransen, C ; Georgiev, G ; Gernhauser, R ; Hess, H ; Iwanicki, J ; Jenkins, DG ; Larsen, AC ; Ljungvall, J ; Lutter, R ; Marley, P ; Moschner, K ; Napiorkowski, PJ ; Pakarinen, J ; Petts, A ; Reiter, P ; Renstrom, T ; Seidlitz, M ; Siebeck, B ; Siem, S ; Sotty, C ; Srebrny, J ; Stefanescu, Irina ; Tveten, GM ; Van de Walle, J ; Vermeulen, M ; Voulot, D ; Warr, N ; Wenander, F ; Wiens, A ; De Witte, Hilde ; Wrzosek-Lipska, Kasia

Keywords:

Science & Technology, Physical Sciences, Physics, Nuclear, Physics, GROUND-STATE PROPERTIES, NEUTRON-RICH NUCLEI, MEAN-FIELD THEORY, SHAPE COEXISTENCE, MO ISOTOPES, LIFETIME MEASUREMENTS, FISSION FRAGMENTS, ATOMIC-NUCLEI, SHELL-MODEL, DEFORMATION, 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, 5106 Nuclear and plasma physics

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.