We report on the observation of two Feshbach resonances in collisions between
ultracold 6Li and 87Rb atoms in their respective hyperfine ground
states ∣F,mF​>=∣1/2,1/2> and ∣1,1>. The resonances show up as trap losses
for the 6Li cloud induced by inelastic Li-Rb-Rb three-body collisions. The
magnetic field values where they occur represent important benchmarks for an
accurate determination of the interspecies interaction potentials. A broad
Feshbach resonance located at 1066.92 G opens interesting prospects for the
creation of ultracold heteronuclear molecules. We furthermore observe a strong
enhancement of the narrow p-wave Feshbach resonance in collisions of 6Li
atoms at 158.55 G in the presence of a dense 87Rb cloud. The effect of the
87Rb cloud is to introduce Li-Li-Rb three-body collisions occurring at a
higher rate than Li-Li-Li collisions.Comment: 4 pages, 3 figure