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

Figure 6

Distributions of time over threshold (TOT) values, for interactions observed in groups of 1, 2 and more within a coincidence time window of 2.5 ns. In the samples with increasing number of coincident photons, the contribution of quanta from annihilations increases with respect to other processes. Gray lines and arrow denote the region used to identify annihilation photon candidates.