Pascal Naidon, Shimpei Endo, Masahito Ueda
We address the microscopic origin of the universal three-body parameter that fixes the spectrum of few-atom systems in the Efimov regime. We identify it with a nonadiabatic deformation of the three-atom system, which explains its universal relationship with the van der Waals length scale observed in several experiments and numerical calculations with atoms, regardless of the depth of their interaction potential.
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http://arxiv.org/abs/1208.3912
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