| Literature DB >> 18764107 |
A Ekström1, J Cederkäll, C Fahlander, M Hjorth-Jensen, F Ames, P A Butler, T Davinson, J Eberth, F Fincke, A Görgen, M Górska, D Habs, A M Hurst, M Huyse, O Ivanov, J Iwanicki, O Kester, U Köster, B A Marsh, J Mierzejewski, P 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 Zielińska.
Abstract
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)e2b2 for 108Sn and B(E2; 0(gs)+-->2(1)+)=0.195(39)e2b2 for 106Sn were determined relative to a stable 58Ni target. The resulting B(E2) values are approximately 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.Entities:
Year: 2008 PMID： 18764107 DOI： 10.1103/PhysRevLett.101.012502
Source DB: PubMed Journal: Phys Rev Lett ISSN： 0031-9007 Impact factor: 9.161