Nuclear-spin-independent short-range three-body physics in ultracold atoms

We investigate three-body recombination loss across a Feshbach resonance in a gas of ultracold Li7 atoms prepared in the absolute ground state and perform a comparison with previously reported results of a different nuclear-spin state. We extend the previously reported universality in three-body recombination loss across a Feshbach resonance to the absolute ground state. We show that the positions and widths of recombination minima and Efimov resonances are identical for both states which indicates that the short-range physics is nuclear-spin independent.