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

Figure 4

Determination of positron polarization axis using its momentum direction (black arrow) estimated using the source position and reconstructed origin of the annihilation of orthopositronium in the chamber wall (dark gray band). The shaded region represents the angular uncertainty of positron flight direction resulting from achievable resolution of the annihilation point.