A microscopic model for estimating n0, the initial exciton number used incalculating pre-equilibrium emission from heavy-ion reactions, is presented. The modelfollows the evolution of the geometrical and phase spaces during the process of fusioningof the target and the projectile. A good agreement is found between the calculated valuesof n0 and the empirical values extracted from fits to nucleon spectra;empirical trends of physical quantities involving n0 are reproduced. Anapproximate expression for calculating n0 as a function of the mass and energyof the colliding system is given.
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