Superdeformation inPd104,105

In the present Rapid Communication, we report the discovery of a rotational band in ${}_{}{}^{105}{}_{}{}^{}\mathrm{Pd}$ and possibly one in ${}_{}{}^{104}{}_{}{}^{}\mathrm{Pd}$ that can be interpreted as arising from superdeformed shapes. The moments of inertia, $J^{\mathrm{}\left(1\right)\mathrm{}}$ and $J^{\mathrm{}\left(2\right)\mathrm{}}$, of these bands are similar to those measured in the Ce-Nd region, once the $A^{\frac{5}{3}}$ mass dependence is removed. This implies a deformation $\epsilon \sim 0.35-0.4$. If so, this is the third mass region where superdeformed bands have been found at high spins.