Inelastic collision rates for ultracold Rb-85 atoms in the F = 2, m(f) = -2
state have been measured as a function of magnetic field. At 250 gauss (G)
, the two- and three-body loss rates were measured to be K-2 = (1.87 +/- 0.
95 +/- 0.19) x 10(-14) cm(3)/s and K-3 = (4.24(-0.29)(+0.70) +/- 0.85) x 10
(-25) cm(6)/s, respectively. As the magnetic field is decreased from 250 G
towards a Feshbach resonance at 155 G, the inelastic rates decrease to a mi
nimum and then increase dramatically, peaking at the Feshbach resonance. Bo
th two- and three-body losses are important, and individual contributions h
ave been compared with theory.