  The $T$=2 excitations in even-even $N$=$Z$ nuclei are calculated within the
isospin cranked mean-field approach. The response of pairing correlations to
rotation in isospace is investigated. It is shown that whereas the isovector
pairing rather modestly modifies the single-particle moment of inertia in
isospace, the isoscalar pairing strongly reduces its value. This reduction of
the moments of inertia in isospace with respect to its rigid body value is a
strong indicator of collective isoscalar pairing correlations. Beautiful
analogies between the role of isovector pairing for the case of spatial
rotations and the role of isoscalar pairing for the case of iso-rotations are
underlined.
