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

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.

Authors: 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

Doi: 10.1103/PhysRevLett.98.172501

Issue number:

Journal: Phys. Rev. Lett.

Page number: 172501

Published on: 2007-04-27

Year: