Study of Coriolis-decoupled bands in 155, 157, 159Dy and 155, 157, 159Er using (α, xnγ) reactions |
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Authors: | H. Beuscher W.F. Davidson R.M. Lieder A. Neskakis C. Mayer-Böricke |
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Affiliation: | 1. Institut für Kernphysik, Kernforschungsanlage Jülich, D-5170 Jülich, West Germany;2. Department of Physics, University of Bonn, D-53 Bonn, West Germany |
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Abstract: | Levels in 155, 157, 159Dy and in 155, 157, 159Er have been populated using (α, xnγ) reactions where x = 5, 7 or 9. The resulting γ-rays have been investigated using in-beam y-spectroscopic techniques. Mixed positive-parity bands were predominantly populated and are identified with the Coriolis-deeoupled bands described in the framework of the rotation-alignment model of Stephens and coworkers. In the case of 157Dy the band was observed up to the + state. The absence of the backbending effect in these nuclei can be explained by the blocking of certain neutron orbitals near the Fermi surface which are essential for the development of the baekbending mechanism. |
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Keywords: | Nuclear reactions |
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