Theory of thermal dechanneling from axial channels

The theory of particle dechanneling from axial channels under the effect of thermal oscillations of the atoms in the crystal lattice is plotted. The theory is based on direct analysis of stochastic properties of the particle motion in the channel under the effect of thermal oscillations, the Fokker-Planck equation for the distribution function of channeled particles over the transverse energy is obtained. The parametric effect of thermal oscillations of the crystal atoms on the transverse motion of the channeled particles is determined. Analytical expressions for the distribution function of channeled particle over the transverse energy, dechanneling function and integral penetration depth distribution function are obtained for particles injected into a crystal under channeling conditions. The theoretical results agree with the results of computer simulation of the channeling phenomenon