Dechanneling of positrons due to lattice disorder has been investigated for two stable configurations of the disordered face-centered cubic(fcc) lattices, Dumb-bell configuration (DBC) and Body-centered interstitial (BCI) for channeled positrons with incident energy (10–200) MeV in Cu single crystal in the planar direction (100). The effects of anharmonic terms in the channeling potential have been considered in the calculations. The calculations covered the transition-channeling probability, dechanneling probability, transmission and dechanneling coefficients. It has been found that the transition-channeling probability from the normal into the disordered region occurs only for the transitions n (normal) → n (disordered). Also the dependence of the transmission and dechanneling coefficients on the incident beam position has been studied by using a planar potential function based on shell structure model and compared with the results of a planar potential based on Lindhard's model.

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:The synthesized graphene oxide (GO)

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The axial and planar potential for α-particles in copper single crystal disordered by dumb-bell configuration (DBC) or body-centered interstitial (BCI) is calculated according to the continuum potential approximation by using Moliere potential and Biersack's universal potential and compared with the channeling potential of the normal lattice. The calculations showed that the axial potential for DBC or BCI are the same, but the planar potential has different estimations for each kind of lattice disorder. The point of minimum potential in the disordered lattice has been determined for both axial and planar channel.