Exotic quantum effects in which statistics and interactions are combined appear in three-particle systems as elucidated by e.g. Efimov in the 1970s. A systematic study of few-body physics is made possible by the use of magnetic Feshbach resonances. One can greatly benefit from the improved experimental precision when comparing the observables to generic few-body models. In this thesis, I begin by describing the efforts we spent on achieving overall robustness and accuracy on our potassium-39 quantum gas machine. Then following a pedagogical review on the realization of Efimov physics in cold atoms, I expand on a series of scattering experiments we performed to understand few-body physics with effectively repulsive inter-particle interactions, as a complement to our previous investigations of the attractive-interaction regime. At the end, I combine our knowledge from both regimes together to discuss the global picture of Efimov physics in homonuclear systems.
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