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Universal dimer in a collisionally opaque medium - effect on Efimov resonances.
Olga Machtey , David A Kessler , Lev Khaykovich
Bar Ilan University
A universal dimer is subject to secondary collisions with atoms when formed in a cloud of ultracold atoms via three-body recombination. We show that in a collisionally opaque medium, the value of the scattering length that results in the maximum number of secondary collisions may not correspond to the Efimov resonance at atom-dimer threshold and thus can not be automatically associated with it. This result explains a number of controversies in recent experimental results on universal three-body states and supports the emerging evidence for the finite range corrections to the first excited Efimov energy level.