Study of the formation of fragments with different clusterization methods

We present a comparison of different clusterization methods based on simple spatial correlation. spatial-momentum correlation and energy minimization (simulated annealing) by simulating the reactions of O + Ag/Br within the q uantum molecular dynamics model. We find that the response of different clu sterization algorithms depends on the asymmetry of the reaction. The moment um correlation methods recognize the fragments between 60-100 fm c(-1),wher eas the simple spatial-correlation method needs a much longer time. The res ponse of a larger nucleon-nucleon cross section as well as of momentum-depe ndent interaction depends on the clusterization algorithm one is using. It is maximal with the spatial correlation method, whereas it is minimal with the energy minimization method. Interestingly, in the presence of a larger nucleon-nucleon cross section. the momentum cut and energy minimization met hods yield a similar evolution. This is true at higher incident energies wh ere the frequency of nucleon-nucleon collisions is very large.