Abstract
We present a detailed analysis of the cold collision measurements performed in ahigh-gradient magneto-optical trap with a few trapped Cs atoms first presented inUeberholz et al (J. Phys. B: At. Mol. Opt. Phys. 33 (2000) L135). The ability toobserve individual loss events allows us to identify two-body collisions that lead tothe escape of only one of the colliding atoms (up to 10% of all collisional losses).Possible origins of these events are discussed here. We also observed strongmodifications of the total loss rate with variations in the repumping laserintensity. This is explained by a simple semiclassical model based on opticalsuppression of hyperfine-changing collisions between ground-state atoms.
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