A Clusterization Model for BUU Calculations
A clustering model that allows the recognition of mass fragments from dynamical simulations has been developed. Studying the evolution of a microscopic computation based on the nuclear-Boltzmann transport equation, a suitable time is chosen to identify the bound clusters. At this “stopping” time the number of binding surfaces for each test nucleon is found. Based on the number of nucleon bindings the interior nucleons are identified, and the cluster kernels are formed. An iterative routine is then applied to determine the coalescence of surrounding free nucleons. Once the fragment formation has been established, a statistical decay code is used to determine the final fragment distributions. Applications are given for the two systems 139La on 27Al, 139La on nat Cu at 45 MeV/nucleon, with model predictions compared to experimental data. An overall agreement between the calculations and the experiment is found.
KeywordsLime Lori Dala
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