Quantum degenerate Bose-Fermi mixture of chemically different atomic species with widely tunable interactions

K causes a sharp enhancement of the fermion density in the presence of a Bose condensate.As explained via the asymptotic bound-state model (ABM), this strong background scattering leadsto a series of wide Feshbach resonances observed at low magnetic fields. Our work opens up theprospect to create chemically stable, fermionic ground state molecules of