Spatiotemporal Distribution of the Energy Absorbed by the Electronic Subsystem During the Retardation of a Fast Heavy Charged Particle in Matter

Abstract

The characteristics of the spatiotemporal distribution of the energy absorbed by the electronic subsystem during the propagation of fast heavy charged particle in matter – the time dependence of the relative fraction of the energy absorbed by electrons per unit path length of a heavy charged particle and as a function of the average squared distance characterizing the size of the region of absorption – are found on the basis of the solution of the linear kinetic equation. These results are obtained in a dimensionless form and depend on the energy of the heavy charged particle per nucleon and on the average ionization potential of the atoms of the material. The characteristics for concrete particles and materials can be determined using the appropriate dimensional variables.