The superdeformation in Au-198 has been studied with EUROGAM II. The y
rast superdeformed band has been extended to very high rotational freq
uencies and a new excited band has been observed. The dynamical moment
of inertia of the yrast SD band exhibits an interesting saturation fe
ature at the highest rotational frequencies. An interpretation is prop
osed in terms of blocked SD proton orbitals.