title: 0(gs)+ -->2(1)+ transition strengths in 106Sn and 108Sn.
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.
authors.affiliation: Physics Department, University of Lund, Box 118, SE-221 00 Lund, Sweden.
authors.forename: A
authors.initials: A
authors.lastname: Ekström
authors.forename: J
authors.initials: J
authors.lastname: Cederkäll
authors.forename: C
authors.initials: C
authors.lastname: Fahlander
authors.forename: M
authors.initials: M
authors.lastname: Hjorth-Jensen
authors.forename: F
authors.initials: F
authors.lastname: Ames
authors.forename: P A
authors.initials: PA
authors.lastname: Butler
authors.forename: T
authors.initials: T
authors.lastname: Davinson
authors.forename: J
authors.initials: J
authors.lastname: Eberth
authors.forename: F
authors.initials: F
authors.lastname: Fincke
authors.forename: A
authors.initials: A
authors.lastname: Görgen
authors.forename: M
authors.initials: M
authors.lastname: Górska
authors.forename: D
authors.initials: D
authors.lastname: Habs
authors.forename: A M
authors.initials: AM
authors.lastname: Hurst
authors.forename: M
authors.initials: M
authors.lastname: Huyse
authors.forename: O
authors.initials: O
authors.lastname: Ivanov
authors.forename: J
authors.initials: J
authors.lastname: Iwanicki
authors.forename: O
authors.initials: O
authors.lastname: Kester
authors.forename: U
authors.initials: U
authors.lastname: Köster
authors.forename: B A
authors.initials: BA
authors.lastname: Marsh
authors.forename: J
authors.initials: J
authors.lastname: Mierzejewski
authors.forename: P
authors.initials: P
authors.lastname: Reiter
authors.forename: H
authors.initials: H
authors.lastname: Scheit
authors.forename: D
authors.initials: D
authors.lastname: Schwalm
authors.forename: S
authors.initials: S
authors.lastname: Siem
authors.forename: G
authors.initials: G
authors.lastname: Sletten
authors.forename: I
authors.initials: I
authors.lastname: Stefanescu
authors.forename: G M
authors.initials: GM
authors.lastname: Tveten
authors.forename: J
authors.initials: J
authors.lastname: Van de Walle
authors.forename: P
authors.initials: P
authors.lastname: Van Duppen
authors.forename: D
authors.initials: D
authors.lastname: Voulot
authors.forename: N
authors.initials: N
authors.lastname: Warr
authors.forename: D
authors.initials: D
authors.lastname: Weisshaar
authors.forename: F
authors.initials: F
authors.lastname: Wenander
authors.forename: M
authors.initials: M
authors.lastname: Zielińska