  The observed shears bands in 198Pb and 199Pb are investigated within the
framework of tilted axis cranking covariant density functional theory, and the
separable pairing force is adopted to consider the pairing correlations. The
energy spectra, total angular momenta, and transition probabilities agree well
with the experimental data. The bandhead energy differences are reproduced
satisfactorily without any ad hoc renormalizations when the pairing
correlations are taken into account. The angular momentum vectors are discussed
in detail to analyze the pairing effects on magnetic rotations.
