  An analytical expression of probability density function (PDF) of
accelerations in turbulence is derived with the help of the multifractal
analysis based on generalized entropy, i.e., the Tsallis or the R\'{e}nyi
entropy. It is shown that the derived PDF explains quite well the one obtained
by Bodenschatz and coworkers in the measurement of fluid particle accelerations
in the Lagrangian frame at $R_\lambda = 970$.
