Abstract
High angular-momentum states in $^{196,197}\mathrm{Bi}$ were populated in the reaction $^{183}\mathrm{W}$ ${(}^{19}$F,xn) at a beam energy of 108 MeV, and \ensuremath{\gamma} rays were detected with the Gammasphere array. Two weakly populated rotational bands, with energy spacings characteristic of superdeformation have been found. Both cascades can be assigned unambiguously to the Bi nuclei; however, their isotopic assignment to $^{197}\mathrm{Bi}$ is tentative. The properties of the bands and their possible structures are discussed. Our results represent the first identification of superdeformed bands in a nucleus of the A\ensuremath{\sim}190 mass region with Z\ensuremath{\gtrsim}82.
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