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

E. A. Stefanova1,*, S. Lalkovski2, A. Korichi3, T. Kutsarova1, A. Lopez-Martens3, F. R. Xu4, H. L. Liu4, S. Kisyov2, A. Minkova2 et al.

D. Bazzacco5, M. Bergström6, A. Görgen7,†, F. Hannachi3,‡, B. Herskind6, H. Hübel7, A. Jansen7, T. L. Khoo8, Zs. Podolyák9,§, and G. Schönwasser7

  • 1Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Science, 1784 Sofia, Bulgaria
  • 2Faculty of Physics, University of Sofia “St. Kliment Ohridski,” 1164 Sofia, Bulgaria
  • 3CSNSM Orsay, IN2P3/CNRS, F-91405, France
  • 4School of Physics, Peking University, Beijing 100871, China
  • 5INFN, Sezione di Padova, I-35131 Padova, Italy
  • 6The Niels Bohr Institut, Blegdamsvej 17, DK-2100 Copenhagen, Denmark
  • 7Helmholtz-Institut für Strahlen -und Kernphysik, Universität Bonn, Nussallee 14-16, D-53115 Bonn, Germany
  • 8Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 9INFN, Laboratori Nazionali di Legnaro, I-35020 Padova, Italy

  • *elenas@inrne.bas.bg
  • †Present address: DAPNIA/SPhN, CEA-Saclay, Gif-sur-Yvette, France.
  • ‡Present address: Centre d'Etudes Nuclaires de Bordeaux-Gradignan, Gradignan, France.
  • §Present address: Department of Physics, University of Surrey, Guildford GU27XH, UK.
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Phys. Rev. C 86, 044302 – Published 1 October, 2012

DOI: https://doi.org/10.1103/PhysRevC.86.044302

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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Phys. Rev. C 86, 044302– Published 1 October, 2012
  • Received 28 March 2012

©2012 American Physical Society

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