Experimental Investigations of Angular Dependence of Scattering and Absorption Cross Sections in Double Photon Compton Scattering

The scattering differential cross sections for double photon Compton scattering have been measured for 0.662 MeV incident gamma photons on aluminium scatterer. The two simultaneously emitted gamma photons in this higher order process are detected in coincidence using two NaI(T1) scintillation spectrometers and 30 nsec timing electronics. Many systematic effects contributing to true events have been taken into account. The measured values of scattering differential cross section agree with theory within experimental estimated error.