Determination of the 3\gamma fraction from positron annihilation in mesoporous materials for symmetry violation experiment with J-PET scanner
B. Jasi\'nska, M. Gorgol, M. Wiertel, R. Zaleski, D. Alfs, T., Bednarski, P. Bia{\l}as, E. Czerwi\'nski, K. Dulski, A. Gajos, B. G{\l}owacz,, D. Kami\'nska, {\L}. Kap{\l}on, G. Korcyl, P. Kowalski, T. Kozik, W., Krzemie\'n, E. Kubicz, M. Mohammed, Sz. Nied\'zwiecki, M. Pa{\l}ka
TL;DR
This study evaluates various mesoporous materials to identify the optimal one for symmetry violation experiments with the J-PET scanner by analyzing the 3γ annihilation fraction and positronium formation.
Contribution
It provides the first comparative analysis of 3γ annihilation fractions in different mesoporous materials for positronium studies.
Findings
3γ fraction varies from 20% to 25% among materials.
Polymer XAD-4 shows the highest 3γ fraction and o-Ps formation.
Materials analyzed have high purity based on SEM/EDS analysis.
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 3\gamma annihilation determined using \gamma-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.
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