Feasibility Study of the Time Reversal Symmetry Tests in Decay of Metastable Positronium Atoms with the J-PET Detector

Figure 8

Explanation of the broadening of the 2 annihilation band present in Figures 7(a) and 7(b) at . Left: when annihilations originate in a small region in the detector center, the calculated relative azimuthal angles of detection modules which registered the photons correspond closely to actual relative angles between photons’ momenta. Right: with annihilations taking place in the walls of an extensive-size annihilation chamber (gray band), the broadening of the band at is caused by a discrepancy between the calculated and actual relative angles. The detector scheme and proportions are not preserved for clarity.