Tuesday, April 3, 2012

1111.5503 (Olga Machtey et al.)

Universal Dimer in a Collisionally Opaque Medium: Experimental
Observables and Efimov Resonances
   [PDF]

Olga Machtey, David A. Kessler, Lev Khaykovich
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 the 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 significant finite range corrections to the first excited Efimov energy level.
View original: http://arxiv.org/abs/1111.5503

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