  The formation of the projectile spectator and the fragmentation processes in
107,124Sn + 120Sn collisions at 600 MeV/nucleon are studied with the
isospin-dependent quantum molecular dynamics (IQMD) model. The minimum spanning
tree algorithm and the ratio of parallel to transverse kinetic quantities are
applied to identify the equilibrated projectile spectator during the dynamical
evolution. The influence of secondary decay on fragmentation observables is
investigated by performing calculations with and without the statistical code
GEMINI. The validity of the theoretical approach is examined by comparing the
calculated product yields and correlations with the experimental results of the
ALADIN Collaboration for the studied reactions.
