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

Phys. Rev. Lett.

98
172501
(2007)
J. Cederkäll, A. Ekström, C. Fahlander, A.M. Hurst, M. Hjorth-Jensen, F. Ames, A. Banu, P.A. Butler, T. Davinson, U. Datta Pramanik, J. Eberth, S. Franchoo, G. Georgiev, M. Górska, D. Habs, M. Huyse, O. Ivanov, J. Iwanicki, O. Kester, U. Köster, B.A. Marsh, O. Niedermaier, T. Nilsson, P. Reiter, H. Scheit, D. Schwalm, T. Sieber, G. Sletten, I. Stefanescu, J. Van De Walle, P. Van Duppen, N. Warr, D. Weißhaar, F. Wenander

The first excited 2+ state of the unstable isotope  
110
 Sn 
  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⁡(𝐸⁢2 :0+ →2+) =0.220 ±0.022⁢𝑒2⁢𝑏2, strengthens the observation of the evolution of the 𝐵⁡(𝐸⁢2) values of neutron deficient Sn isotopes that was observed recently in intermediate-energy Coulomb excitation of  
108
 Sn 
 . 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  
100
 Sn 
  is approached.

DOI
10.1103/PhysRevLett.98.172501
Published on
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