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Article Dans Une Revue Physical Review Letters Année : 2004

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

Résumé

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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Dates et versions

hal-00001027 , version 1 (13-01-2004)
hal-00001027 , version 2 (30-08-2004)

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Signe Seidelin, Rodolphe Hoppeler, Olivier Sirjean, Denis Boiron, Alain Aspect, et al.. Getting the elastic scattering length by observing inelastic collisions in ultracold metastable helium atoms. Physical Review Letters, 2004, 93, pp.090409. ⟨hal-00001027v2⟩
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