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We report on the observation of collective atomic recoil lasing andsuperradiant Rayleigh scattering with ultracold and Bose-Einstein condensedatoms in an optical ring cavity. Both phenomena are based on instabilitiesevoked by the collective interaction of light with cold atomic gases. Thispublication clarifies the link between the two effects. The observation ofsuperradiant behavior with thermal clouds as hot as several tens of$\mu\textrm{K}$ proves that the phenomena are driven by the cooperativedynamics of the atoms, which is strongly enhanced by the presence of the ringcavity.Comment: 10 pages, 10 figure

Cavity-enhanced superradiant Rayleigh scattering with ultracold and Bose-Einstein condensed atoms