  We report the measurement of collisions between two Bose-Einstein condensates
with strong dipolar interactions. The collision velocity is significantly
larger than the internal velocity distribution widths of the individual
condensates, and thus, with the condensates being sufficiently dilute, a halo
corresponding to the two-body differential scattering cross section is
observed. The results demonstrate a novel regime of quantum scattering,
relevant to dipolar interactions, in which a large number of angular momentum
states become coupled during the collision. We perform Monte-Carlo simulations
to provide a detailed comparison between theoretical two-body cross sections
and the experimental observations.
