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Sub-Barrier Coulomb Excitation of $^{110}$Sn and Its Implications for the $^{100}$Sn Shell Closure

Abstract : The first excited 2+ state of the unstable isotope 110Sn has been studied in safe Coulomb excitation at 2.82 MeV/u using the MINIBALL array at the REX-ISOLDE post accelerator at CERN. This is the first measurement of the reduced transition probability of this state using this method for a neutron deficient Sn isotope. The strength of the approach lies in the excellent peak-to-background ratio that is achieved. The extracted reduced transition probability, B(E2:0+-->2+)=0.220±0.022e2b2, strengthens the observation of the evolution of the B(E2) values of neutron deficient Sn isotopes that was observed recently in intermediate-energy Coulomb excitation of 108Sn. It implies that the trend of these reduced transition probabilities in the even-even Sn isotopes is not symmetric with respect to the midshell mass number A=116 as 100Sn is approached.
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Contributor : Dominique Girod <>
Submitted on : Tuesday, July 3, 2007 - 11:14:42 AM
Last modification on : Wednesday, September 16, 2020 - 4:08:16 PM

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J. Cederkäll, A. Ekström, C. Fahlander, A.M. Hurst, M. Hjorth-Jensen, et al.. Sub-Barrier Coulomb Excitation of $^{110}$Sn and Its Implications for the $^{100}$Sn Shell Closure. Physical Review Letters, American Physical Society, 2007, 98, pp.172501. ⟨10.1103/PhysRevLett.98.172501⟩. ⟨in2p3-00159419⟩



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