The study of state-to-state spin-exchange collisions near $p$-wave Feshbach resonances offers great opportunities to explore many-body interactions and novel quantum phases. Here, we report the observation of a spin-exchange collision near a $p$-wave Feshbach resonance within a mixture of the lowest and third-lowest hyperfine states of ${}^6\mathrm{Li}$ atoms. The spin-exchange interaction is observed over a range of 10 G and produces a pair of atoms in the second-lowest hyperfine states that are captured by a deep optical dipole trap. We apply a coupled-channel method to calculate the scattering properties of this system. We find that the $p$-wave resonance exhibits a low inelastic collision rate and a broad resonance profile, which is due to the modification by the accompanying spin-exchange collisions. These findings open up new possibilities for the creation of long-lived, strongly interacting $p$-wave Fermi gases.

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• Fermi gases
• Scattering of atoms, molecules, clusters & ions
• Ultracold collisions