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Physical Review C 86 (2012) 044302
Observation of positive-parity bands in 109Pd and 111Pd: Enhanced γ softness
E. A. Stefanova, S. Lalkovski, A. Korichi1, T. Kutsarova, A. Lopez-Martens1, F. R. Xu, H. L. Liu, S. Kisyov, A. Minkova, D. Bazzacco, M. Bergström, A. Görgen, F. Hannachi1, B. Herskind, H. Hübel, A. Jansen, T. L. Khoo, Zs. Podolyák, G. Schönwasser

The neutron-rich nuclei 109Pd and 111Pd were produced as fission fragments following the 30Si+168Er reaction at 142 MeV. Using the identification based on the coincidences with the complementary fission fragments, the only positive-parity bands observed so far in 109Pd and 111Pd emerged from this work. A band, built on top of the 5/2+ ground state exhibiting ΔI=1 energy-level staggering, was observed in each of these nuclei. Both nuclei of interest, 109Pd and 111Pd, are suggested to lie in the transitional region of Pd isotopes of maximum γ softness. The ground states of both nuclei are predicted by total Routhian surface calculations to be extremely γ soft with shallow triaxial minima. The first crossing in the new bands is proposed to be attributable to an alignment of h11/22 neutrons.
1:  CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
Physics/Nuclear Experiment
gamma transitions and level energies – Nuclear structure models and methods – Fusion and fusion-fission reactions – 90<=A<=149
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