Determination of the 3γfraction from positron annihilation in mesoporous materials for symmetry violation experiment with J-PET scanner
arXiv:1602.05376 · doi:10.5506/APhysPolB.47.453
Abstract
Various mesoporous materials were investigated to choose the best material for experiments requiring high yield of long-lived positronium. We found that the fraction of 3γannihilation determined using γ-ray energy spectra and positron annihilation lifetime spectra (PAL) changed from 20% to 25%. The 3gamma fraction and o-Ps formation probability in the polymer XAD-4 is found to be the largest. Elemental analysis performed using scanning electron microscop (SEM) equipped with energy-dispersive X-ray spectroscop EDS show high purity of the investigated materials.
12 pages, 2 figures