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

Summary, in English

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.

• Author: Andreas Ekström; Joakim Cederkäll; Claes 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
• Department/s: Nuclear physics
• Publishing year: 2008
• Language: English
• Publication/Series: Physical Review Letters
• Volume: 101
• Issue: 1
• Links: http://dx.doi.org/10.1103/PhysRevLett.101.012502
• Document type: Journal article
• Publisher: American Physical Society
• Topic: Subatomic Physics
• Status: Published
• ISBN/ISSN/Other: ISSN: 1079-7114