Abstract
Excited states in 188Tl have been studied experimentally using the 157Gd (35Cl, 4n) reaction at a beam energy of 170MeV. A rotational band built on the πh9/2 ⊗ νi13/2 configuration with oblate deformation has been established for 188Tl. Based on the structure systematics of the oblate πh9/2 ⊗ νi13/2 bands in the heavier odd-odd Tl nuclei, we have tentatively proposed spin values for the new band in 188Tl. The πh9/2 ⊗ νi13/2 oblate band in 188Tl shows low-spin signature inversion, and it can be interpreted qualitatively by the two-quasiparticle plus rotor model including a J-dependent p-n residual interaction.
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