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

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arxiv 1602.05376 v1 pith:ZVW5ETCS submitted 2016-02-17 nucl-ex physics.ins-det

Determination of the 3γ 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
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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 L. Raczy\'nski Z. Rudy O. Rundel N.G. Sharma M. Silarski A. S{\l}omski A. Strzelecki A.Wieczorek W. Wi\'slicki B. Zgardzi\'nska M. Zieli\'nski P. Moskal
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classification nucl-ex physics.ins-det
keywords annihilationfractiongammamaterialsfoundhighinvestigatedmesoporous
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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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