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1.
Absolute fraction of emitted Ps determined by GEANT4 supported analysis of gamma spectra / Rienäcker, Benjamin (CERN ; Tech. U., Munich (main)) ; Gigl, Thomas (Tech. U., Munich (main)) ; Nebbia, Giancarlo (INFN, Padua) ; Pino, Felix (INFN, Padua) ; Hugenschmidt, Christoph (Tech. U., Munich (main))
The fraction of positronium (Ps) emitted from a surface of a germanium single crystal at high temperature is usually assumed to approach unity at zero positron implantation energy. In the experiment, however, the determination of the absolute Ps fraction is not straight forward since recording a reference spectrum with $100\,\%$ Ps formation remains demanding. [...]
arXiv:2010.01854.- 2020-12-18 - 8 p. - Published in : Phys. Rev. A 102 (2020) 062212 Fulltext: 2010.01854 - PDF; PhysRevA.102.062212 - PDF;
2.
A fiber detector to monitor ortho-Ps formation and decay / Rienäcker, Benjamin (CERN) ; Brusa, Roberto Sennen (U. Trento (main) ; TIFPA-INFN, Trento) ; Caravita, Ruggero (TIFPA-INFN, Trento) ; Mariazzi, Sebastiano (TIFPA-INFN, Trento) ; Penasa, L. (Trento U. ; TIFPA-INFN, Trento) ; Pino, Felix (U. Padua, Dept. Phys. Astron.) ; Ranum, Oline Aas (U. Amsterdam, GRAPPA) ; Nebbia, Giancarlo (INFN, Padua)
We describe a novel method to use a scintillating fiber detector similar to the Fast Annihilation Cryogenic Tracking (FACT) used at the antimatter experiment AE$\bar{g}$IS to monitor the presence of ortho-positronium. A single scintillating fiber was coupled to a photomultiplier tube and irradiated by flashes of about 6 x 10$^{6}$ 511 keV $\gamma$-rays produced by $\approx10\,\text{ns}$ long positron pulses. [...]
arXiv:2111.01503.- 2022-03-11 - 6 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 1027 (2022) 166275 Fulltext: PDF;

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