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

Figure 3

Scheme of the positronium production setup devised for positron polarization determination in J-PET experiment. Positrons are produced in a source mounted in the center of a cylindrical vacuum chamber coaxial with the detector. Positronium atoms are formed by the interaction of positrons in a porous medium covering the chamber walls. Determination of an o-Ps→3 annihilation position in the cylinder provides an estimate of positron momentum direction.