E. A. Stefanova, S. Lalkovski, A. Korichi, T. Kutsarova, A. Lopez-Martens, F. R. Xu, H. L. Liu, S. Kisyov, A. Minkova, D. Bazzacco, M. Bergström, A. Görgen, F. Hannachi, B. Herskind, H. Hübel, A. Jansen, T. L. Khoo, Zs. Podolyák, G. Schönwasser
The neutron-rich nuclei $^{109}$Pd and $^{111}$Pd were produced as fission fragments following the $^{30}$Si + $^{168}$Er 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 $^{109}$Pd and $^{111}$Pd emerged from this work. A band, built on top of the 5/2$^+$ ground state exhibiting $\Delta I$ = 1 energy-level staggering, was observed in each of these nuclei. Both nuclei of interest, $^{109}$Pd and $^{111}$Pd, are suggested to lie in the transitional region of Pd isotopes of maximum $\gamma$-softness. The ground states of both nuclei are predicted by TRS calculations to be extremely $\gamma$-soft with shallow triaxial minima. The first crossing in the new bands is proposed to be due to an alignment of $h^2_{11/2}$ neutrons.
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http://arxiv.org/abs/1206.1173
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