  We study the occurence of delay mechanisms other than periodic orbits in
systems with time dependent potentials that exhibit chaotic scattering. By
using as model system two harmonically oscillating disks on a plane, we have
found the existence of a mechanism not related to the periodic orbits of the
system, that delays trajectories in the scattering region. This mechanism
creates a fractal-like structure in the scattering functions and can possibly
occur in several time-dependent scattering systems.
