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Excited states of the odd-odd nucleus 158Tb have been studied via the 154Sm(7Li ,3n) 158Tb reaction at a beam energy of 27 MeV. The new level scheme of 158Tb involving a positive parity rotational band is established up to excitation energy ∼2.3 MeV and spin ∼17ħ. By comparing with the rotational bands in the neighboring nuclei 157Tb and 157Gd, the configuration was tentatively assigned as πd5/2⊗ vi13/2 , and the phenomenon of signature inversion is discussed. [ABSTRACT FROM AUTHOR]

High-spin level structures of 199Tl have been studied by in-beam γ-ray spectroscopic methods using the 196Pt(7Li, 4n)199Tl reaction at 40 MeV of beam energy. A large number of new states have been found, resulting in a significant extension of the previously known level scheme with the observation of 44 new transitions and 33 new levels. By comparing with the level structures in the odd-mass Tl isotopes and the even-even core Hg nuclei, configurations are proposed for the newly observed rotational bands and states in 199Tl. The properties of the strongly coupled positive- and negative-parity bands can be interpreted in terms of the cranked Nilsson-Strutinsky-Bogoliubov model calculations, which show that the observed bands are built on the oblate shapes. [ABSTRACT FROM AUTHOR]