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Magnetically-tunable Feshbach resonances are an indispensable tool forexperiments with atomic quantum gases. We report on twenty thus far unpublishedFeshbach resonances and twenty one further probable Feshbach resonances in spinmixtures of ultracold fermionic 40 K with temperatures well below 100 nK. Inparticular, we locate a broad resonance at B=389.6 G with a magnetic width of26.4 G. Here 1 G=10^-4 T. Furthermore, by exciting low-energy spin waves, wedemonstrate a novel means to precisely determine the zero crossing of thescattering length for this broad Feshbach resonance. Our findings allow forfurther tunability in experiments with ultracold 40 K quantum gases.

Investigation of Feshbach Resonances in ultra-cold 40 K spin mixtures