Investigation of angular and energy characteristics of channeled protons in thick tungsten by the Monte-Carlo method

Angular and energy characteristics of protons channeled in a thick target are investigated by the Monte-Carlo method. To estimate the role of a plane component under axial channeling the model of binary collisions with atom chain is used. Depth dependences of backscattering yield as well as angular distributions and spectra of 1 MeV proton energy passing to flight through Si and Au crystals are calculated. Beam incidence parallel to direction <111> when at low depths particles hit in a plane is excluded due blocking of plane directions by atomic chains is simulated. Increasing population of a plane component is observed with the increase of target thickness. 5 refs.; 2 figs