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Coherence, Correlations, and Collisions: What One Learns about Bose-Einstein Condensates from Their Decay

, , , , , and . Physical Review Letters, 79 (3): 337--340 (Jul 21, 1997)
DOI: 10.1103/physrevlett.79.337

Abstract

We have used three-body recombination rates as a sensitive probe of the statistical correlations between atoms in Bose-Einstein condensates (BEC) and in ultracold noncondensed dilute atomic gases. We infer that density fluctuations are suppressed in the BEC samples. We measured the three-body recombination rate constants for condensates and cold noncondensates from number loss in the F = 1,mf = -1 hyperfine state of 87Rb. The ratio of these is 7.4(2.6) which agrees with the theoretical factor of 3! and demonstrates that condensate atoms are less bunched than noncondensate atoms.

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