On the validity of energy partitioning in the theory of radiation damage cascades

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Abstract
A detailed investigation has been made of the number of defects produced by a primary knock on atom in a medium of similar atoms. Electronic stopping and channelling have been included and it is clearly seen that, for m>1/4, Lindhard's energy partitioning theory is valid to a high degree of accuracy. For m1/4 where the normal energy deposition function diverges, new expressions have been obtained for the number of defects produced in terms of a correction factor to be applied to the Kichin-Pease result (1955). The main assumption underlying the above work is that the angular distribution in the centre of mass system is isotropic but can be partially corrected for by the use of a transport mean free path. The combined effect of channelling, using Oen p-factor (1963), and electronic stopping are studied, and exact solutions enable their relative importance to the cascade to be assessed.

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