Excited rotational bands in the high-spin region of deformed nuclei

Rotational bands of deformed nuclei in the rare-earth region in the vicinity of the yrast line are investigated within the framework of the random phase approximation based on a self-consistent solution of the Hartree-Fock-Bogolyubov equations in the rotating system. For low angular momenta one finds the well-known β, δ and γ vibrational bands and non-collective two-quasiparticle bands. In the high-spin region additional aligned bands develop. They are dramatically lowered in energy by the Coriolis interaction. Several band crossings occur. The calculated spectra are in fair agreement with experimental measurements.