Europhys. Lett.
Volume 76, Number 1, October 2006
Page(s) 8 - 14
Section General
Published online 30 August 2006
Europhys. Lett., 76 (1), pp. 8-14 (2006)
DOI: 10.1209/epl/i2006-10235-1

Efimov states for systems with negative scattering lengths

S. Jonsell

Department of Physics, Umeå University - SE-90187 Umeå, Sweden.

received 11 July 2006; accepted in final form 9 August 2006
published online 30 August 2006

The recent experimental results showing the existence of an Efimov state (KRAEMER T. et al., Nature, 440 (2006) 315) are used to fix the three-body parameter for cesium. With the value of this parameter known, several three-body properties can be calculated quantitatively, without any other information about the boson-boson interaction. Finite-temperature results for the rate of formation of dimers are found to agree very well with the experimental results. Properties of bound Efimov states and predissociative Efimov resonances are calculated. The lifetime of the predissociative resonances are calculated using the complex coordinate rotation method. For Efimov states confined by an external harmonic potential there are significant changes to both energies and lifetimes if the oscillator length is comparable to or smaller than the two-body scattering length.

03.75.Nt - Other Bose-Einstein condensation phenomena.
21.45.+v - Few-body systems.
34.50.-s - Scattering of atoms and molecules.

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