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1.
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Production of antihydrogen atoms by 6 keV antiprotons through a positronium cloud
/ Adrich, P. (NCBJ, Swierk) ; Blumer, P. (Zurich, ETH) ; Caratsch, G. (Zurich, ETH) ; Chung, M. (UNIST, Ulsan) ; Cladé, P. (Paris, Lab. Kastler Brossel) ; Comini, P. (IRFU, Saclay) ; Crivelli, P. (Zurich, ETH) ; Dalkarov, O. (Unlisted) ; Debu, P. (IRFU, Saclay) ; Douillet, A. (Paris, Lab. Kastler Brossel ; U. Evry) et al.
We report on the first production of an antihydrogen beam by charge exchange of 6.1 keV antiprotons with a cloud of positronium in the GBAR experiment at CERN. The antiproton beam was delivered by the AD/ELENA facility. [...]
arXiv:2306.15801.-
2023-11-06 - 18 p.
- Published in : Eur. Phys. J. C
Fulltext: 2306.15801 - PDF; Publication - PDF; Erratum - PDF;
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2.
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${\bar {\mathrm {H}}^{+}}$ production from collisions between positronium and keV antiprotons for GBAR
/ Comini, Pauline (IRFU, SPP, Saclay) ; Hervieux, Paul-Antoine (IPCMS, Strasbourg) ; Biraben, Francois (Paris, Lab. Kastler Brossel)
In the framework of the GBAR (Gravitational Behaviour of Antihydrogen at Rest) experiment, cross sections for antihydrogen ion ( $\bar {\mathrm {H}}^{+}$ ) production in collisions between antiprotons ( $\bar {\mathrm {p}}$ ) and excited positronium atoms (Ps), with intermediate production of antihydrogen ( $\bar {\mathrm {H}}$ ), have been computed using a perturbative theory, namely Continuum Distorted Wave - Final State (CDW-FS). The results suggest to use antiprotons at 1, 2 or 6 keV with, respectively, Ps(3p,3d), Ps(2p) or no Ps excitation. [...]
2014 - 7 p.
- Published in : Hyperfine Interact. 228 (2014) 159-165
In : 11th International Conference on Low Energy Antiproton Physics, Uppsala, Sweden, 10 - 15 Jun 2013, pp.159-165
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3.
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$\bar{H}$ and $\bar{H}^{+}$ production cross sections for the GBAR experiment
/ Comini, P (IRFU, SPP, Saclay) ; Hervieux, P -A (IPCMS, Strasbourg)
The production and cooling of the + ion is the key point of the GBAR experiment (Gravitational Behaviour of Antihydrogen at Rest), which aims at performing the free fall of antihydrogen atoms to measure , the acceleration of antimatter on Earth. + ions will be obtained from collisions between a positronium cloud and antiprotons delivered by the AD/ELENA facility at CERN, with intermediate formation of antihydrogen atoms. [...]
2013 - 4 p.
- Published in : J. Phys. : Conf. Ser. 443 (2013) 012007
Fulltext: PDF;
In : 16th International Conference on Positron Annihilation, Bristol, UK, 19 - 24 Aug 2012, pp.012007
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4.
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The Gbar project, or how does antimatter fall?
/ Indelicato, Paul (Paris, Lab. Kastler Brossel) ; Chardin, G (CSNSM, Orsay) ; Grandemange, P (CSNSM, Orsay) ; Lunney, D (CSNSM, Orsay) ; Manea, V (CSNSM, Orsay) ; Badertscher, A (Zurich, ETH) ; Crivelli, P (Zurich, ETH) ; Curioni, A (Zurich, ETH) ; Marchionni, A (Zurich, ETH) ; Rossi, B (Zurich, ETH) et al.
The Einstein classical Weak Equivalence Principle states that the trajectory of a particle is independent of its composition and internal structure when it is only submitted to gravitational forces. This fundamental principle has never been directly tested with antimatter. [...]
2014 - 10 p.
- Published in : Hyperfine Interact. 228 (2014) 141-150
In : 11th International Conference on Low Energy Antiproton Physics, Uppsala, Sweden, 10 - 15 Jun 2013, pp.141-150
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5.
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6.
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Positron accumulation in the GBAR experiment
/ GBAR Collaboration
We present a description of the GBAR positron (e+) trapping apparatus, which consists of a three stage Buffer Gas Trap (BGT) followed by a High Field Penning Trap (HFT), and discuss its performance. The overall goal of the GBAR experiment is to measure the acceleration of the neutral antihydrogen (H) atom in the terrestrial gravitational field by neutralising a positive antihydrogen ion (H+), which has been cooled to a low temperature, and observing the subsequent H annihilation following free fall. [...]
arXiv:2205.04530.-
2022-07-25 - 28 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 1040 (2022) 167263
Fulltext: PDF;
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7.
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A pulsed high-voltage decelerator system to deliver low-energy antiprotons
/ Husson, A (IJCLab, Orsay) ; Kim, B H (Seoul Natl. U., Dept. Phys. Astron.) ; Welker, A (CERN) ; Charlton, M (Swansea U.) ; Choi, J J (Seoul Natl. U., Dept. Phys. Astron.) ; Chung, M (UNIST, Ulsan) ; Cladé, P (Paris, Lab. Kastler Brossel) ; Comini, P (IRFU, Saclay) ; Crépin, P -P (Paris, Lab. Kastler Brossel) ; Crivelli, P (Zurich, ETH-CSCS/SCSC) et al.
The GBAR (Gravitational Behavior of Antihydrogen at Rest) experiment at CERN requires efficient deceleration of 100 keV antiprotons provided by the new ELENA synchrotron ring to synthesize antihydrogen. This is accomplished using electrostatic deceleration optics and a drift tube that is designed to switch from -99 kV to ground when the antiproton bunch is inside – essentially a charged particle “elevator” – producing a 1 keV pulse. [...]
2021 - 7 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 1002 (2021) 165245
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8.
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9.
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10.
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Development of a PbWO$_4$ Detector for Single-Shot Positron Annihilation Lifetime Spectroscopy at the GBAR Experiment
/ Kim, B H (Seoul Natl. U.) ; Choi, J J (Seoul Natl. U.) ; Chung, M (UNIST, Ulsan) ; Cladé, P (Paris, Lab. Kastler Brossel) ; Comini, P (IRFU, Saclay) ; Crivelli, P (Zurich, ETH) ; Crépin, P-P (Paris, Lab. Kastler Brossel) ; Dalkarov, O (Lebedev Inst.) ; Debu, P (IRFU, Saclay) ; Dodd, L (Swansea U.) et al.
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 ($\mathrm{o-Ps}$) 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 $\mathrm{o-Ps}$ to reduce part of the uncertainties of the measurement. [...]
2020 - 4 p.
- Published in : Acta Phys. Pol. A 137 (2020) 122-125
In : 15th International Workshop on Slow Positron Beam Techniques and Applications, Prague, Czechia, 2-6 Sep 2019, pp.122-125
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