Fragmentation paths in dynamical models

摘要

We undertake a quantitative comparison of multi-fragmentation reactions, asmodeled by two different approaches: the Antisymmetrized Molecular Dynamics(AMD) and the momentum-dependent stochastic mean-field (SMF) model. Fragmentobservables and pre-equilibrium (nucleon and light cluster) emission areanalyzed, in connection to the underlying compression-expansion dynamics ineach model. Considering reactions between neutron-rich systems, observablesrelated to the isotopic properties of emitted particles and fragments are alsodiscussed, as a function of the parametrization employed for the isovector partof the nuclear interaction. We find that the reaction path, particularly themechanism of fragmentation, is different in the two models and reflects on someproperties of the reaction products, including their isospin content. Thisshould be taken into account in the study of the density dependence of thesymmetry energy from such collisions.