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We report on measurements of an elementary surface mode in an ultracold,strongly interacting Fermi gas of 6Li atoms. The radial quadrupole mode allowsus to probe hydrodynamic behavior in the BEC-BCS crossover without beinginfluenced by changes in the equation of state. We examine frequency anddamping of this mode, along with its expansion dynamics. In the unitarity limitand on the BEC side of the resonance, the observed frequencies agree withstandard hydrodynamic theory. However, on the BCS side of the crossover, astriking down shift of the oscillation frequency is observed in thehydrodynamic regime as a precursor to an abrupt transition to collisionlessbehavior; this indicates coupling of the oscillation to fermionic pairs.

Dynamics of a strongly interacting Fermi gas: the radial quadrupole mode