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Observation of positive-parity bands in 109Pd and 111Pd: Enhanced γ softness

E. A. Stefanova S. Lalkovski A. Korichi 1 T. Kutsarova A. Lopez-Martens 1 F. R. Xu H. L. Liu S. Kisyov A. Minkova D. Bazzacco M. Bergström A. Görgen F. Hannachi 1 B. Herskind H. Hübel A. Jansen T. L. Khoo Zs. Podolyák G. Schönwasser
CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, CSNSM - Centre de Sciences Nucléaires et de Sciences de la Matière : UMR8609
Abstract : 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.
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Submitted on : Thursday, November 8, 2012 - 3:33:03 PM
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E. A. Stefanova, S. Lalkovski, A. Korichi, T. Kutsarova, A. Lopez-Martens, et al.. Observation of positive-parity bands in 109Pd and 111Pd: Enhanced γ softness. Physical Review C, American Physical Society, 2012, 86, pp.044302. ⟨10.1103/PhysRevC.86.044302⟩. ⟨in2p3-00749894⟩



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