SUPERDEFORMED BANDS IN TL-191

High spin states in the Tl-198 nucleus have been populated via the Tb- 159(S-36,4n) reaction at 165 MeV. Two weakly populated rotational band s have been observed with properties (energy spacings and dynamic mome nts of inertia) very similar to those of other superdeformed bands in the A approximately 190 region. The two bands can be interpreted as si gnature partners which exhibit some signature splitting for rotational frequencies HomegaBAR greater-than-or 0.2 MeV. They are interpreted w ithin the framework of cranked Woods-Saxon calculations as being based on the proton i13/2(OMEGA=5/2) intruder orbital, in agreement with pa irs of superdeformed bands seen in neighboring odd TI nuclei.