The influence of multiple scattering on channeling radiation from gev positrons

Classical calculations of the intensity of channeling radiation from GeV positrons moving in continuum potentials agree reasonably well with experimental data. However, generally, the peaks of the experimental spectrum appear at 5-10% lower frequencies, and they are broader. Since multiple scattering was expected to cause such changes, the classical formula for the intensity has been extended to include this effect. While the calculated broadening is of the right order, it appears that multiple scattering is not the major cause of the shift.