This paper discusses the two types of loss experiments conducted at MIT on sodium Bose-Einstein condensate, using a time-varying magnetic field in the proximity of a Feshbach resonance. The various processes discussed here involve a temporary formation of a molecular condensate. In the slow-sleep experiment the dominant loss mechanism is three-body deactivation by atom-molecule inelastic collisions. A best fit of an analytical expression for the atomic density obtained here to the MIT data yields a rate coefficient for deactivating atom-molecule collisions of 1.6 × 10-10 cm3/s. For the fast-sweep experiment an analytical expression, generalizing the Landau-Zener formula to a case of coupled nonlinear equations, is obtained. The combined effect of the two mechanisms is studied here, including molecule-molecule deactivating collisions.
|Number of pages||5|
|Journal||Physical Review A - Atomic, Molecular, and Optical Physics|
|State||Published - Oct 2000|