  We investigate the production of s-wave scattering halos from collisions
between the momentum components of a Bose-Einstein condensate released from an
optical lattice. The lattice periodicity translates in a momentum comb
responsible for the quantization of the halos' radii. We report on the
engineering of those halos through the precise control of the atom dynamics in
the lattice: we are able to specifically enhance collision processes with given
center-of-mass and relative momenta. In particular, we observe quantized
collision halos between opposite momenta components of increasing magnitude, up
to 6 times the characteristic momentum scale of the lattice.
