

FIZIKA B 1 (1992) 1, 5160 A MICROSCOPIC MODEL FOR CALCULATING THE INITIAL NUMBER OF EXCITONS IN NUCLEUSNUCLEUS COLLISIONSNIKOLA CINDRO^{1}, EMIL BETAK^{2}, MILORAD KOROLIJA^{1}
and JAMES J.GRIFFIN^{3} Received 2 July 1991A microscopic model for estimating n_{0}, the initial exciton number used in calculating preequilibrium emission from heavyion reactions, is presented. The model follows the evolution of the geometrical and phase spaces during the process of fusioning of the target and the projectile. A good agreement is found between the calculated values of n_{0} and the empirical values extracted from fits to nucleon spectra; empirical trends of physical quantities involving n_{0} are reproduced. An approximate expression for calculating n_{0} as a function of the mass and energy of the colliding system is given. UDC 539.17 
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