Time dependence of characteristics of electronuclear system

The dynamics of electronuclear process created in a large nature-uranium target by a proton beam with energy 1 GeV simulated by means of Monte Carlo method. The fission of creating plutonium nuclei leads to a sharp rise in neutron density and, respectively, concentration of plutonium increases drastically too. For example, when current of accelerated protons equals 100 mA, the concentration of easy-fissile nuclei increases 4-5 times during first six months and is approximately doubled again during the next half-year. Because of increasing the neutron density in target periphery the leakage of neutrons rises hundreds times. During a year the heat yield on oncreases almost 50 times. At the same time the shape of space distribution of plutonium (the normalized distribution) is not changed. 3 refs.; 5 figs.; 1 tab