A semiclassical simulation is made for the reaction Ca-40(35 MeV/nucle
on)+Ca-40. The experimental fragment charge dispersion in the reaction
is reproduced reasonably. Time evolutions of the fragment charge disp
ersion and of the average square of the component of particle momentum
seem to indicate that the nuclear system formed in the intermediate e
nergy nucleus-nucleus collisions might approach thermal equilibrium in
the case of nearly central collisions.