THE ABSOLUTE DOUBLE-DIFFERENTIAL COMPTON-SCATTERING CROSS-SECTION OF CU 1S ELECTRONS

The absolute double-differential Compton scattering cross section for high-energy x-rays has been measured for K-shell electrons of copper u sing the coincidence technique. Three different momentum-transfer valu es have been used which are all in the interesting range where the rol e of the electron binding energy is important. The results have been c ompared with the existing calculations emphasizing the role of the imp ulse approximation. The impulse approximation is found to work surpris ingly well and the small deviations are explained via more detailed ca lculations.