Sub-barrier coulomb excitation of Sn110 and Its implications for the Sn100 shell closure

J. Cederkäll, A. Ekström, C. Fahlander, A.M. Hurst, M. Hjorth-Jensen, F. Ames, A. Banu, P.A. Butler, T. Davinson, U.D. Pramanik, J. Eberth, S. Franchoo, G. Georgiev, M. Górska, D. Habs, M. Huyse, O. Ivanov, J. Iwanicki, O. Kester, U. KösterB.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

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Abstract

The first excited 2+ state of the unstable isotope Sn110 has been studied in safe Coulomb excitation at 2.82MeV/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 Sn108. 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 Sn100 is approached. © 2007 The American Physical Society.
Original languageEnglish
Article number172501
JournalPhysical Review Letters
Volume98
Issue number17
DOIs
Publication statusPublished - 27 Apr 2007

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