Bulg. J. Phys. vol.42 no.4 (2015), pp. 583-592



Structure of Low-Lying Positive-Parity States in 99,101,103Ru from In-Beam Fast-Timing Measurements

S. Kisyov1,2, S. Lalkovski1,3, D. Ivanova1, N. Mărginean2, D. Bucurescu2, Gh. Căta-Danil2, I. Căta-Danil2, D. Deleanu2, D.G. Ghiţă2, T. Glodariu2, R. Lica2, R. Mărginean2, C. Mihai2, A. Negret2, C.R. Niţa2, S. Pascu2, P.Petkov4, T. Sava2, E. Stefanova4, R. Şuvăilă2, S. Toma2, O. Yordanov4, N.V. Zamfir2
1Faculty of Physics, St. Kliment Ohridski University of Sofia, 1164 Sofia, Bulgaria
2Horia Hulubei National Institute for R\&D in Physics and Nuclear Engineering (IFIN-HH), P.O.BOX MG-6, Bucharest – Magurele, Romania
3Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom
4Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Science, 1784 Sofia, Bulgaria}
Abstract. 99,101,103Ru were populated in (α,nγ) reactions. Half-lives in the sub-nanosecond range were measured by using the ROSPHERE γ ray array. Results for the first 3/2+99,101Ru and the first 7/2+ states in 99,101,103Ru were obtained and are discussed within the Rigid-Triaxial-Rotor-plus-Particle model. Calculated level energies are in good agreement with the experimental level scheme but the model fails in reproduction of some of the reduced transition probabilities. This is, most probably, due to wave function admixtures which are outside the model space.

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