Effect of temperature on transmission of planar channeled positrons in cubic metals containing point defects

Characterization the point defects in cubic metals can be attained by investigation the transmission of planar channeled positively charged particles thorough the regions containing point defects in the metal. A quantum-mechanical calculation for the transmission coefficient and the probability distribution of the transmitted positrons after passing the region containing point defect was performed in the planar channel (1 0 0). The effect of temperature was taken into consideration in the calculations which was made at metal temperatures up to 600 K by using the Debye approximation of lattice thermal vibrations. The calculations showed that the net planar potential at the channel center is slightly higher at higher temperatures and the transmission probability is decreasing with increasing the temperature. The incident energy of the channeled positron was taken in MeV region. The effect of higher anharmonic terms on the planar channeling potential was considered where new bound states was found.