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The collective flow of nucleons and that of fragments in the 12C + 12Creaction below 150 MeV/nucleon are calculated with the antisymmetrized versionof molecular dynamics combined with the statistical decay calculation. Densitydependent Gogny force is used as the effective interaction. The calculatedbalance energy is about 100 MeV/nucleon, which is close to the observed value.Below the balance energy, the absolute value of the fragment flow is largerthan that of nucleon flow, which is also in accordance with data. Thedependence of the flow on the stochastic collision cross section and its originare discussed. All the results are naturally understood by introducing theconcept of two components of flow: the flow of dynamically emitted nucleons andthe flow of the nuclear matter which contributes to both the flow of fragmentsand the flow of nucleons due to the statistical decay.Comment: 20 pages, PostScript figures, LaTeX with REVTeX and EPSF, KUNS 121

Nucleon flow and fragment flow in heavy ion reactions