Near-yrast, medium-spin structure of the Tc109 nucleus

W. Urban, J. A. Pinston, T. Rza̧ca-Urban, J. Kurpeta, A. G. Smith, I. Ahmad

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    Excited levels in the Tc109 nucleus, populated in the spontaneous fission of Cm248, have been studied using the EUROGAM2 array. In Tc109 we have found a new band corresponding to the π5/2⊃-[303] configuration and a three-quasiparticle band with Iπ=(15/2⊃-) band-head level at 1749.5 keV. The structure of the 1749.5-keV level probably involves the {π5/2⊃+[422] ν(5/2⊃-[532],5/2⊃+[413])}15⊃/2⊃- prolate configuration. The quasiparticle-rotor model calculations performed in this work show that the odd-proton configurations observed in Tc107 and Tc109 are consistent with the scheme of proton excitations in a prolate triaxial potential. Significant differences between the degree of triaxiality observed for positive- and negative-parity excitations may be due to blocking of the triaxial shape by the odd proton populating negative-parity orbitals. The properties of the new 494.5-, 1440.7-, and 1748.8-keV levels found in Tc109 may indicate a change toward an oblate shape in this nucleus. © 2010 The American Physical Society.
    Original languageEnglish
    Article number064308
    JournalPhysical Review C - Nuclear Physics
    Issue number6
    Publication statusPublished - 13 Dec 2010


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