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Development of a PbWO 4 detector for single-shot positron annihilation lifetime spectroscopy at the GBAR experiment

Abstract : We have developed a PbWO 4 (PWO) detector with a large dynamic range to measure the intensity of a positron beam and the absolute density of the ortho-positronium (o-Ps) cloud it creates. A simulation study shows that a setup based on such detectors may be used to determine the angular distribution of the emission and reflection of o-Ps to reduce part of the uncertainties of the measurement. These will allow to improve the precision in the measurement of the cross section for the (anti) hydrogen formation by (anti) proton-positronium charge exchange and to optimize the yield of antihydrogen ion which is an essential parameter in the GBAR experiment.
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https://hal.archives-ouvertes.fr/hal-03060600
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Submitted on : Monday, December 14, 2020 - 9:34:30 AM
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B Kim, J Choi, M Chung, P Cladé, P Comini, et al.. Development of a PbWO 4 detector for single-shot positron annihilation lifetime spectroscopy at the GBAR experiment. Acta Physica Polonica A, Polish Academy of Sciences. Institute of Physics, 2020, Proc. of the 15th Int. Workshop on Slow Positron Beam Techniques and Applications, Prague, September 2–6, 2019, 137, pp.122-125. ⟨10.12693/APhysPolA.137.122⟩. ⟨hal-03060600⟩

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