Observation of heteronuclear Feshbach resonances in a mixture of bosons and fermions

Three magnetic-field induced interspecies Feshbach resonances were observed in collisions between bosonic 87Rb and fermionic 40K atoms in their absolute ground states. At the resonance positions of 492, 512, and 543±2 G, strong inelastic loss from an optically trapped mixture was observed. The two higher-field resonances were found to have s wave character, while the narrow feature at 492 G represented a p-wave resonance. The results show that changing C 6 has a negligible effect on the error bars.