We report experimental results on the acceleration component probability distribution
function at Rλ= 690 to probabilities of less than 10− 7. This is an improvement of more than
an order of magnitude over past measurements and allows us to conclude that the fourth
moment converges and the flatness is approximately 55. We compare our probability
distribution to those predicted by several models inspired by non-extensive statistical
mechanics. We also look at acceleration component probability distributions conditioned on …