Determination of the 3fraction from positron annihilation in mesoporous materials for symmetry violation experiment with J-PET scanner. B. Jasińska 1* , M. Gorgol 1 , M. Wiertel 1 , R. Zaleski 1 , D. Alfs 2 , T. Bednarski 2 , P. Białas 2 , E. Czerwiński 2 , K. Dulski 2 , A. Gajos 2 , B. Głowacz 2 , D. Kamińska 2 , Ł. Kapłon 2,3 , G. Korcyl 2 , P. Kowalski 4 , T. Kozik 2 , W. Krzemień 5 , E. Kubicz 2 , M. Mohammed 2 , Sz. Niedźwiecki 2 , M. Pałka 2 , L. Raczyński 4 , Z. Rudy 2 , O. Rundel 2 , N.G. Sharma 2 , M. Silarski 2 , A. Słomski 2 , A. Strzelecki 2 , A.Wieczorek 2,3 , W. Wiślicki 4 , B. Zgardzińska 1 , M. Zieliński 2 , P. Moskal 2 1 Department of Nuclear Methods, Institute of Physics, Maria Curie-Sklodowska University, Pl. M. Curie-Skłodowskiej 1, 20-031 Lublin, Poland 2 Faculty of Physics, Astronomy and Applied Computer Science, Jagiellonian University, S.Łojasiewicza 11, 30-348 Kraków, Poland 3 Institute of Metallurgy and Materials Science of Polish Academy of Sciences, W. Reymonta 25, 30-059 Kraków, Poland 4 Świerk Computing Centre, National Centre for Nuclear Research, A. Soltana 7, 05-400 Otwock-Świerk, Poland 5 High Energy Physics Division, National Centre for Nuclear Research, A. Soltana 7, 05-400 Otwock-Świerk, Poland 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 3annihilation determined using –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. *Corresponding author: [email protected]
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Determination of the 3 fraction from positron annihilation
in mesoporous materials for symmetry violation experiment with J-PET scanner.
B. Jasińska1*, M. Gorgol1, M. Wiertel1, R. Zaleski1, D. Alfs2, T. Bednarski2, P. Białas2, E. Czerwiński2,
K. Dulski2, A. Gajos2, B. Głowacz2, D. Kamińska2, Ł. Kapłon2,3, G. Korcyl2, P. Kowalski4, T. Kozik2,
W. Krzemień5, E. Kubicz2, M. Mohammed2, Sz. Niedźwiecki2, M. Pałka2, L. Raczyński4, Z. Rudy2,
O. Rundel2, N.G. Sharma2, M. Silarski2, A. Słomski2, A. Strzelecki2, A.Wieczorek2,3, W. Wiślicki4,
B. Zgardzińska1, M. Zieliński2, P. Moskal2
1 Department of Nuclear Methods, Institute of Physics, Maria Curie-Sklodowska University, Pl. M.
Curie-Skłodowskiej 1, 20-031 Lublin, Poland
2Faculty of Physics, Astronomy and Applied Computer Science, Jagiellonian University,
S.Łojasiewicza 11, 30-348 Kraków, Poland
3Institute of Metallurgy and Materials Science of Polish Academy of Sciences,
W. Reymonta 25, 30-059 Kraków, Poland
4Świerk Computing Centre, National Centre for Nuclear Research,
A. Soltana 7, 05-400 Otwock-Świerk, Poland
5High Energy Physics Division, National Centre for Nuclear Research,
A. Soltana 7, 05-400 Otwock-Świerk, Poland
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 annihilation
determined using –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
Table 2. The 3 fraction determined from PALS and –ray spectra.
Sample f3[%]PALS f3[%]–ray
IC3100 16.9(66) 13.34(13)
IC3110 23.7(118) 19.49(19)
IC3120 24.2(109) 18.96(18)
LA1000 25.8(158) 21.59(21)
SBA-15 25.5(173) 19.80(19)
XAD-4 28.9(54) 24.44(24)
Fig. 1. Gammaray spectra measured using a HPGe detector. Kapton is reference material
where no positronium is formed (0% Ps). Spectra were normalized to an equal height of the
511 keV peak. Small peaks come from natural radiation.
Fig.2 SEM images and EDS spectra acquired for aerogel LA-1000 (top row) and polymer XAD-4 (bottom).
Acknowledgments We acknowledge technical and administrative support of A. Heczko, M. Kajetanowicz, G. Konopka-Cupiał, W. Migdał, and the financial support by the Polish National Centre for Research and Development through grant INNOTECH-K1/IN1/64/159174/NCBR/12, and grant LIDER/274/L-6/14/NCBR/2015, the Foundation for Polish Science through MPD programme, the EU and MSHE Grant No. POIG.02.03.00-161 00- 013/09, and The Marian Smoluchowski Krakow Research Consortium Matter-Energy-Future.
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