Berlin 2001 – scientific programme

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A: Atomphysik

A 16: Cooling and Trapping V (joint session A and Q)

A 16.4: Talk

Thursday, April 5, 2001, 18:15–18:30, H104

Elastic scattering of single atoms by Bose-Einstein condensates — •Ivo Häring and Jan-Michael Rost — Max-Planck-Institute for the Physics of Complex Systems Dresden

Bose-Einstein condensates in spherically symmetric magnetic traps are governed by a single parameter Γ which is the ratio of the number of condensed particles times the s-wave scattering length of the atoms over the characteristic length of the trap. Corresponding to attractive and repulsive binary interactions, e.g. ⁷ Li and ²³Na, ⁸⁷Rb respectively, the parameter is negative or positive.

Elastic partial and total cross sections are formulated in the Born approximation and additionaly by keeping only terms of highest order in the number N₀ of particles in the condensate [1]. Convergence properties of the full Born series are investigated using an analytical expression for the field operator in the limit of large Γ [2].

Results for the cross sections will be presented as a function of Γ and the impact energy.

[1] Z. Idziaszek et al., J. Phys. B 32 L205 (1999)

[2] P. Öhberg et al., Phys. Rev. A 56 3346 (1997)