FIZIKA B 1 (1992) 1, 51-60

A MICROSCOPIC MODEL FOR CALCULATING THE INITIAL NUMBER OF EXCITONS IN NUCLEUS-NUCLEUS COLLISIONS

NIKOLA CINDRO¹, EMIL BETAK², MILORAD KOROLIJA¹ and JAMES J.GRIFFIN^3
1Ruđer Bošković Institute, 41001 Zagreb, POB 1016, Croatia
²Institute of Physics, Slovak Academy of Science, 84228 Bratislava, Czecho-Slovakia
³Department of Physics, University of Maryland, College Park, MD 20742, U.S.A.

Received 2 July 1991

A microscopic model for estimating n₀, the initial exciton number used in calculating pre-equilibrium emission from heavy-ion 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 n₀ and the empirical values extracted from fits to nucleon spectra; empirical trends of physical quantities involving n₀ are reproduced. An approximate expression for calculating n₀ as a function of the mass and energy of the colliding system is given.

UDC 539.17

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