Getting the elastic scattering length by observing inelastic collisions in ultracold metastable helium atoms

Details Getting the elastic scattering length by observing inelastic collisions in ultracold metastable helium atoms Getting the elastic scattering length by observing inelastic collisions in ultracold metastable helium atoms

2004-01-13

arxiv.org/abs/cond-mat/0401217v2

Physical Review Letters 93 (2004) 090409

Physics

Condensed Matter

Other Condensed Matter

Scientific paper

10.1103/PhysRevLett.93.090409

We report an experiment measuring simultaneously the temperatureand the flux of ions produced by a cloud of triplet metastablehelium atoms at the Bose-Einstein critical temperature. The onsetof condensation is revealed by a sharp increase of the ion fluxduring evaporative cooling. Combining our measurements withprevious measurements of ionization in a pure BEC,we extract an improved value of the scattering length$a=11.3^{+2}_{-1}$ nm. The analysis includes corrections takinginto accountthe effect of atomic interactions on the criticaltemperature, and thus an independent measurement of the scatteringlength would allow a new test of these calculations.

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