Model of multiparticle preequilibrium decay

The possibility of calculating the spectra of several sequentially emitted nucleons was implemented on the basis of the exciton model of the preequilibriumdecay of a nucleus bymeans of a Monte Carlo simulation. A method for determining the instant of statistical equilibration in a composite system formed by intermediate- and high-energy nucleons was proposed. Calculations on the basis of the proposed model were combined with the results of calculations based on the statistical model of nuclear reactions and the intranuclear-cascade model. A systematic comparison of the results of these calculations with experimental data on the spectra of nucleons from (p, xn), (p, xp), (n, xn), and (n, xp) reactions in the projectile-energy range between 20 and 160 MeV was performed. The cross sections for the fission of heavy nuclei that was induced by protons and neutrons of energy in the range extending up to 3 GeV were calculated, and the results of those calculations were contrasted against available experimental data.