0(gs)(+)-> 2(1)(+) transition strengths in (106)Sn and (108)Sn

A. Ekstroem, J. Cederkaell, C. Fahlander, M. Hjorth-Jensen, F. Ames, P. A. Butler, T. Davinson, J. Eberth, F. Fincke, A. Goergen, M. Gorska, D. Habs, A. M. Hurst, M. Huyse, O. Ivanov, J. Iwanicki, O. Kester, U. Koester, B. A. Marsh, J. MierzejewskiP. Reiter, H. Scheit, D. Schwalm, S. Siem, G. Sletten, I. Stefanescu, G. M. Tveten, J. Van de Walle, P. Van Duppen, D. Voulot, N. Warr, D. Weisshaar, F. Wenander, M. Zielinska

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The reduced transition probabilities, B(E2;0(gs)(+)-> 2(1)(+)), have been measured in the radioactive isotopes (108,106)Sn using subbarrier Coulomb excitation at the REX-ISOLDE facility at CERN. Deexcitation gamma rays were detected by the highly segmented MINIBALL Ge-detector array. The results, B(E2;0(gs)(+)-> 2(1)(+))=0.222(19)e(2)b(2) for (108)Sn and B(E2;0(gs)(+)-> 2(1)(+))=0.195(39)e(2)b(2) for (106)Sn were determined relative to a stable (58)Ni target. The resulting B(E2) values are similar to 30% larger than shell-model predictions and deviate from the generalized seniority model. This experimental result may point towards a weakening of the N=Z=50 shell closure.
Original languageUndefined/Unknown
JournalPhysical Review Letters
Issue number1
Publication statusPublished - 4 Jul 2008

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