  Two research groups have measured turbulent velocity statistics in superfluid
helium using different techniques. The results were in conflict: one experiment
revealed Gaussian distributions(as observed in ordinary turbulence), the other
experiment determined power-laws. To solve the apparent puzzle, we numerically
model quantum turbulence as a tangle of vortex filaments, and conclude that
there is no contradiction between the two experiments. The transition from
Gaussian to power-law arises from the different length scales which are probed
using the two techniques. We find that the average distance between the quantum
vortices marks the separation between quantum and quasi-classical length
scales.
