  The fluctuations in the particle size distribution for processes of
fragmentation and aggregation are studied for stationary state regimes. The
system is described in terms of a stochastic process over an adequate tree
structure. The RMS fluctuations appear to scale with the square root of the
mean distribution, as in the case of sums of statistically independent events.
Implications for the applicability of a mean field description to fragmentation
and agglomeration processes, and possible relation with intermittency phenomena
in three dimensional turbulence are discussed.
