COMPTON-SCATTERING OF 20-KEV TO 40-KEV PHOTONS

The scattered-energy spectra of monochronized synchrotron-radiation photons toward 90°by C, Al, Fe, Cu, Au, and Pb samples were measured using high-purity Ge detectors to obtain incoherent scattering function (S) in the 1.14<x<2.28-A-1 region. The multiple-scattering intensity was evaluated by a Monte Carlo calculation while considering the Doppler broadening of the Compton-scattered photons and the photon linear polarization. The measured S of C, Al, Fe, and Cu agreed with that based on the Waller-Hartree theory (SWH), as well as that based on a relativistic impulse approximation (SIA) within the experiment error (2.5%). The measured S of high-Z atoms (Au and Pb) agrees with SIA and is smaller than SWH by 3-6 %. © 1995 The American Physical Society.