Semiclassical description of the pairing force matrix elements at finite rotational frequencies

The matrix elements of the pair field between orbitals of a deformed rotating potential as a function of the rotational frequency are studied within a semiclassical model. The oscillations, which were previously found by solving the motion of nucleons in an $i_{13/2}$ orbital, arise from the interference between the single-particle motion at the crossing points of an orbit with the time reversed of its partner.