The new dynamic model of light charged particle (LCP) formation in ternary fission is presented. The model is based on the assumption that light particles are formed as a result of two random neck ruptures during the time interval about one single-particle period. The connection of the final stage of ternary fission and of the saddle point descent stage was obtained in the framework of the density moments method. The analysis of LCP formation has shown that LCP mass and charge distributions are strongly governed by statistical nucleon exchange in the LCP-light fragment double system. New semiclassical expressions for the calculations of LCP yields and relative ternary fission probability are given. The results of calculations are in satisfactory agreement with the experimental data.
Abstract. Nuclear data for high projectile energies are needed to design an Accelerator Driven System (target, material activation, heating, shielding, etc.). The files of evaluated neutron and proton nuclear data were created in ENDF-6 format for the projectile particle energies from 20 MeV to 1000 MeV. The evaluated data of the files are based mainly on the modern theoretical model calculations with MCFx code. Three mechanism of nuclear reaction were modeled in computing: i) intranuclear cascade; ii) preequilibrium exciton multiparticle emission and iii) statistical decay of excited nuclei. The experimental data available were used to benchmark of the model calculation results. The data on neutron total and reaction cross sections were used to create and to check the set of the optical model parameters in wide energy region. The experimental spectra of 208 Pb(p,xn) reaction for projectile energies up to 160 MeV were described with one set of the model parameter. The measured fission cross sections of 208 Pb by protons and neutrons were described without fitting practically. The files contain total cross sections, fission cross sections, elastic scattering cross sections and angular distributions, proton-and neutron energy-angular distributions.
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