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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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${\bar {\mathrm {H}}^{+}}$ 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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4.
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GBAR
/ Joubert, J et al.
- GBAR.
Approved: 30 May 2012.-
Status: Preparation
External link: Experiment home page
Experiment: AD-7
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The GBAR antimatter gravity experiment
/ Pérez, P (IRFU, SPhN, Saclay) ; Banerjee, D (Zurich, ETH) ; Biraben, F (Paris, Lab. Kastler Brossel) ; Brook-Roberge, D (IRFU, SPhN, Saclay) ; Charlton, M (Swansea U.) ; Cladé, P (Paris, Lab. Kastler Brossel) ; Comini, P (IRFU, SPhN, Saclay) ; Crivelli, P (Zurich, ETH) ; Dalkarov, O (Lebedev Inst.) ; Debu, P (IRFU, SPhN, Saclay) et al.
The GBAR project (Gravitational Behaviour of Anti hydrogen at Rest) at CERN, aims to measure the free fall acceleration of ultracold neutral anti hydrogen atoms in the terrestrial gravitational field. The experiment consists preparing anti hydrogen ions (one antiproton and two positrons) and sympathetically cooling them with Be$^{+}$ ions to less than 10 μK. [...]
2015 - 7 p.
- Published in : Hyperfine Interact. 233 (2015) 21-27
In : 5th International Conference on Exotic Atoms and Related Topics, Vienna, Austria, 15 - 19 Sep 2014, pp.21-27
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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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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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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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