Experimental measurement of intensity distribution in two-photon Compton scattering

Cross-sections of two-photon Compton scattering process for 0.662 MeV incident photons have been measured at θ1 = 70o, θ2 = φ2 = 90o and at θ1=θ2 = 90o, φ2 135o. The two scattered photons are detected in coincidence using two NaI(Tl) scintillation spectrometers and 30 ns timing electronics. The cross-section values, although of same magnitude, are consistently higher. Some calculations are also carried out to understand the important features of this weak process. (author)