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Various mesoporous materials were investigated to choose the best materialfor experiments requiring high yield of long-lived positronium. We found thatthe fraction of 3\gamma annihilation determined using \gamma-ray energy spectraand positron annihilation lifetime spectra (PAL) changed from 20% to 25%. The3gamma fraction and o-Ps formation probability in the polymer XAD-4 is found tobe the largest. Elemental analysis performed using scanning electron microscop(SEM) equipped with energy-dispersive X-ray spectroscop EDS show high purity ofthe investigated materials.

Determination of the 3\gamma fraction from positron annihilation in mesoporous materials for symmetry violation experiment with J-PET scanner