  We describe a new implementation of magnetic collider for investigating cold
collisions between ultracold atomic clouds in different spin states, and we use
this to investigate scattering involving both even and odd order partial waves.
Our method relies on the axial assymetry of a double-well magnetic trap to
selectively prepare the spin state in each cloud. We measure the energy
dependence of s, p and d partial wave phase shifts in collisions up to 300
microKelvin between ^{87}Rb atoms in the 5S_{1/2}, F=1, m_F=-1 and 5S_{1/2},
F=2, m_F=1 states.
