Superdeformed Bands In Tl-191

High spin states in the Tl-191 nucleus have been populated via the Tb-159(S-36,4n) reaction at 165 MeV. Two weakly populated rotational bands have been observed with properties (energy spacings and dynamic moments of inertia) very similar to those of other superdeformed bands in the A approximately 190 region. The two bands can be interpreted as signature partners which exhibit some signature splitting for rotational frequencies HomegaBAR greater-than-or 0.2 MeV. They are interpreted within the framework of cranked Woods-Saxon calculations as being based on the proton i13/2(OMEGA=5/2) intruder orbital, in agreement with pairs of superdeformed bands seen in neighboring odd TI nuclei.