Excitation strengths in 109Sn: Single-neutron and collective excitations near 100Sn

Phys. Rev. C

86
031302(R)
(2012)
D.D. DiJulio, J. Cederkäll, C. Fahlander, A. Ekström, M. Hjorth-Jensen, M. Albers, V. Bildstein, A. Blazhev, I. Darby, T. Davinson, H. De Witte, J. Diriken, Ch. Fransen, K. Geibel, R. Gernhäuser, A. Görgen, H. Hess, J. Iwanicki, R. Lutter, P. Reiter, M. Scheck, M. Seidlitz, S. Siem, J. Taprogge, G.M. Tveten, J. Van de Walle, D. Voulot, N. Warr, F. Wenander, K. Wimmer

A set of 𝐵⁡(𝐸⁢2) values for the low-lying excited states in the radioactive isotope 109Sn were deduced from a Coulomb excitation experiment. The 2.87-MeV/𝑢 radioactive beam was produced at the REX-ISOLDE facility at CERN and was incident on a secondary 58Ni target. The 𝐵⁡(𝐸⁢2) values were determined using the known 2+→0+ reduced transition probability in 58Ni as normalization with the semiclassical Coulomb excitation code gosia2. The transition probabilities are compared to shell-model calculations based on a realistic nucleon-nucleon interaction and the predictions of a simple core-excitation model. This measurement represents the first determination of multiple 𝐵⁡(𝐸⁢2) values in a light Sn nucleus using the Coulomb excitation technique with low-energy radioactive beams. The results provide constraints for the single-neutron states relative to 100Sn and also indicate the importance of both single-neutron and collective excitations in the light Sn isotopes.

DOI
10.1103/PhysRevC.86.031302
Published on
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