engleski

Detector-to-detector backscattering in germanium at 59.5 keV

The differential cross section for Compton scattering d^2 sigma/d Omega dE in germanium (Z=32) was measured using the sensitive volume of a Ge detector as the scatterer and another Ge detector for detection of the scattered radiation, at an incident energy of 59.537 keV and the scattering angle of about 170 degrees. The application of the coincidence technique and the requirement of a constant energy sum yield a clear spectrum in a broad energy range. Detailed analyses of the processes involved in the detector-to-detector scattering were made, including various double-scattering processes. Calculations show that bremsstrahlung of photoelectrons dominates at low energies, while all double-scattering processes weakly contribute to the coincidence rates. The influence of Compton-Rayleigh and Rayleigh-Compton scattering is relatively stronger at high energy, while an approximate proportionality of Compton-Compton and single Compton spectra at scattering angles close to 180 degrees was obtained, assuming the impulse approximation. Single and double Compton scattering on stationary electrons at 180 degrees have been shown to produce photons of exactly equal energy. The measured differential cross sections for Compton scattering and results of calculations based on the impulse approximation are in a fair agreement.

Compton scattering; coincidence measurements

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