Thermal effects in blocking calculations by a diffusion model

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Abstract
In this paper a new method is proposed for calculating, for any transverse energy, the diffusive nuclear contribution to the rate of increase with depth of the mean transverse energy of positively charged ions subjected to the stochastic effects of the thermal vibrations of the string atoms of a crystal. A thermally averaged single-string potential is used to calculate the average force and the initial transverse energy distribution. The corresponding diffusion equation is solved in the case of axial blocking of ∼2 MeV α-particles in aluminium single crystal, already studied in a previous work. The results here reported are still in satisfactory agreement with Monte Carlo simulations.