Phys. Rev. Lett. 101, 012502 (2008) [4 pages]0gs+→21+ Transition Strengths in 106Sn and 108SnReceived 21 February 2008; published 2 July 2008 The reduced transition probabilities, B(E2;0gs+→21+), have been measured in the radioactive isotopes 108,106Sn using subbarrier Coulomb excitation at the REX-ISOLDE facility at CERN. Deexcitation γ rays were detected by the highly segmented MINIBALL Ge-detector array. The results, B(E2;0gs+→21+)=0.222(19)e2b2 for 108Sn and B(E2;0gs+→21+)=0.195(39)e2b2 for 106Sn were determined relative to a stable 58Ni target. The resulting B(E2) values are ∼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. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.012502
DOI:
10.1103/PhysRevLett.101.012502
PACS:
23.20.Js, 21.60.Cs, 25.70.De, 27.60.+j
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