  Fragment production in central collisions of Xe+Sn has been systematically
studied with the INDRA multidetector from 25 to 150 AMeV. The predominant role
of collision dynamics is evidenced in multiple intermediate mass fragment
production even at the lowest energies, around the so-called
"multifragmentation threshold". For beam energies 50 AMeV and above, a
promising agreement with suitably modified Antisymmetrised Molecular Dynamics
calculations has been achieved. Intriguingly the same reactions have recently
been interpreted as evidence for a liquid-gas phase transition in
thermodynamically equilibrated systems. The universal fluctuation theory,
thanks to its lack of any equilibrium hypothesis, shows clearly that in all but
a tiny minority of carefully-selected central collisions fragment production is
incompatible with either critical or phase coexistence behaviour. On the other
hand, it does not exclude some similarity with aggregation scenarios such as
the lattice-gas or Fisher droplet models.
