1211.2270 (M. R. Hadizadeh et al.)

Effective range from tetramer dissociation data    [PDF]

M. R. Hadizadeh, M. T. Yamashita, Lauro Tomio, A. Delfino, T. Frederico

The shifts in the four-body recombination peaks, due to lowest order range corrections in the zero range results close to the unitary limit, are obtained and used to extract the corresponding effective range of a given atomic system. From the experimental values of the tetramer dissociation positions of an ultracold gas of cesium atoms close to broad Feshbach resonances, the effective ranges are extracted, with a weighted average given by 3.9$\pm 0.8 R_{{vdW}}$, where $R_{{vdW}}$ is the van der Waals length scale. This result is consistent with the van der Waals potential tail for the $Cs_2$ system. The method can be generally applied to other cold atom experimental setups to determine the corresponding effective range.

View original: http://arxiv.org/abs/1211.2270