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1.
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Positron Manipulation and Positronium Laser Excitation in AEgIS
/ Mariazzi, Sebastiano (OAW, Vienna) ; Caravita, Ruggero ; Aghion, Stefano ; Amsler, Claude ; Ariga, Akitaka ; Ariga, Tomoko ; Bonomi, Germano ; Bräunig, Philippe ; Bremer, Johan (CERN) ; Brusa, Roberto S et al.
Production of antihydrogen by using the charge exchange reaction, as proposed by AEgIS (Antimatter Experiment: gravity, Interferometry, Spectroscopy), requires the formation of a dense cloud of positronium atoms excited to Rydberg states. In this work, the recent advances in AEgIS towards this result are described. [...]
2017 - 6 p.
- Published in : Defect and Diffusion Forum 373 (2017) 11-16
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2.
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Overview of recent work on laser excitation of positronium for the formation of antihydrogen
/ Yzombard, P (LAC, Orsay) ; Amsler, C (Bern U., LHEP) ; Ariga, T (Bern U., LHEP) ; Bonomi, G (Brescia U. ; INFN, Pavia) ; Bräunig, P (Kirchhoff Inst. Phys.) ; Brusa, R S (Trento U. ; TIFPA-INFN, Trento) ; Cabaret, L (LAC, Orsay) ; Caccia, M (INFN, Milan) ; Caravita, R (Genoa U. ; INFN, Genoa ; CERN) ; Castelli, F (INFN, Milan ; Milan U.) et al.
The AEgIS experiment carried out at CERN aims to form a cold antihydrogen beam to perform precision studies on gravity. A key ingredient is the creation of antihydrogen via a charge-exchange process between trapped antiprotons and Rydberg excited positronium atoms (Ps). [...]
2017 - 11 p.
- Published in : JPS Conf. Proc. 18 (2017) 011026
Fulltext: PDF;
In : 12th International Conference on Low Energy Antiproton Physics, Kanazawa, Japan, 6 - 11 Mar 2016, pp.011026
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3.
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Probing electric and magnetic fields with a Moiré deflectometer
/ Lansonneur, P (Lyon, IPN) ; Bräunig, P (Kirchhoff Inst. Phys.) ; Demetrio, A (Kirchhoff Inst. Phys.) ; Müller, S R (Kirchhoff Inst. Phys.) ; Nedelec, P (Lyon, IPN) ; Oberthaler, M K (Kirchhoff Inst. Phys.)
A new contact-free approach for measuring simultaneously electric and magnetic field is reported, which considers the use of a low energy ion source, a set of three transmission gratings and a position sensitive detector. Recently tested with antiprotons (Aghion et al., 2014) [1] at the CERN Antiproton Decelerator facility, this paper extends the proof of principle of a moiré deflectometer (Oberthaler et al., 1996) [2] for distinguishing electric from magnetic fields and opens the route to precision measurements when one is not limited by the ion source intensity. [...]
2017 - 5 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 862 (2017) 49-53
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4.
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The AEgIS experiment at CERN: measuring antihydrogen free-fall in earth’s gravitational field to test WEP with antimatter
/ Brusa, R S (Trento U. ; TIFPA-INFN, Trento) ; Amsler, C (U. Bern, AEC) ; Ariga, T (Bern U., LHEP) ; Bonomi, G (U. Brescia ; INFN, Pavia) ; Bräunig, P (Kirchhoff Inst. Phys.) ; Cabaret, L ; Caccia, M (INFN, Milan ; Insubria U., Como) ; Caravita, R (Genoa U. ; INFN, Genoa) ; Castelli, F (INFN, Milan ; Milan U.) ; Cerchiari, G (Heidelberg, Max Planck Inst.) et al.
The AEgIS (Antimatter Experiment: Gravity, Interferometry, Spectroscopy) experiment is designed with the objective to test the weak equivalence principle with antimatter by studying the free fall of antihydrogen in the Earth’s gravitational field. A pulsed cold beam of antihydrogen will be produced by charge exchange between cold Ps excited in Rydberg state and cold antiprotons. [...]
2017 - 8 p.
- Published in : J. Phys.: Conf. Ser. 791 (2017) 012014
In : 14th International Workshop on Slow Positron Beam Techniques and Applications, Matsue, Japan, 22 - 27 May 2016, pp.012014
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5.
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Probing antimatter gravity – The AEGIS experiment at CERN
/ Kellerbauer, A (Heidelberg, Max Planck Inst.) ; Aghion, S (Milan Polytechnic ; INFN, Milan) ; Amsler, C (Bern U., LHEP) ; Ariga, A (Bern U., LHEP) ; Ariga, T (Bern U., LHEP) ; Bonomi, G (INFM, Brescia ; INFN, Pavia) ; Bräunig, P (Kirchhoff Inst. Phys.) ; Bremer, J (CERN) ; Brusa, R S (INFN, Padua ; Trento U. ; TIFPA-INFN, Trento) ; Cabaret, L (CSNSM, Orsay) et al.
/AEGIS
The weak equivalence principle states that the motion of a body in a gravitational field is independent of its structure or composition. This postulate of general relativity has been tested to very high precision with ordinary matter, but no relevant experimental verification with antimatter has ever been carried out. [...]
2016 - 10 p.
- Published in : EPJ Web Conf. 126 (2016) 02016
Fulltext: PDF;
In : 4th International Conference on New Frontiers in Physics, Kolymbari, Greece, 23 - 30 Aug 2015, pp.02016
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6.
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Direct detection of antiprotons with the Timepix3 in a new electrostatic selection beamline
/ Pacifico, N (Bergen U.) ; Aghion, S (Milan Polytechnic ; INFN, Milan) ; Alozy, J (CERN) ; Amsler, C (Bern U., LHEP) ; Ariga, A (Bern U., LHEP) ; Ariga, T (Bern U., LHEP) ; Bonomi, G (Brescia U. ; INFN, Pavia) ; Bräunig, P (Kirchhoff Inst. Phys.) ; Bremer, J (CERN) ; Brusa, R S (Trento U. ; TIFPA-INFN, Trento) et al.
We present here the first results obtained employing the Timepix3 for the detection and tagging of annihilations of low energy antiprotons. The Timepix3 is a recently developed hybrid pixel detector with advanced Time-of-Arrival and Time-over-Threshold capabilities and has the potential of allowing precise kinetic energy measurements of low energy charged particles from their time of flight. [...]
2016 - 6 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 831 (2016) 12-17
In : 10th International "Hiroshima" Symposium on the Development and Application of Semiconductor Tracking Detectors, Xi'an, China, 25 - 29 Sep 2015, pp.12-17
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7.
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Towards a gravity measurement on cold antimatter atoms
/ Caravita, R (Oslo U.) ; Aghion, S (Oslo U.) ; Amsler, C (Bern U.) ; Ariga, A (Bern U.) ; Ariga, T (Bern U.) ; Bonomi, G (Oslo U.) ; Bräunig, P (Kirchhoff Inst. Phys.) ; Bremer, J (CERN) ; Brusa, R S (Oslo U.) ; Cabaret, L (U. Paris-Saclay, Orsay) et al.
/AEGIS
The present status of the AEGIS experiment at CERN (AD-06), on the way of forming anti-hydrogen for a first gravity measurement, is reviewed. Recent results in trapping and cooling positrons and antiprotons in the main electromagnetic traps are presented, including the storage time measurement obtained during the 2014 run with antiprotons, the observation of centrifugal separation of a mixed antiproton/electron plasma and positron accumulation and transfer results obtained during 2015..
2016 - 6 p.
- Published in : Nuovo Cimento C 39 (2016) 237
Fulltext: PDF;
In : 24th Incontri di Fisica delle Alte Energie, Rome, Italy, 8 - 10 Apr 2015, pp.237
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The Weak Equivalence Principle With Antimatter: The AEgIS Experiment At CERN
/ Pagano, D (Bern U. ; Brescia U.) ; Amsler, C (Bern U.) ; Ariga, T (Brescia U.) ; Bonomi, G (Bern U.) ; Bräunig, P (Heidelberg U.) ; Brusa, R S (Trento U. ; TIFPA-INFN, Trento) ; Cabaret, L (Orsay) ; Caccia, M (INFN, Milan ; Insubria U., Como) ; Caravita, R (Genoa U. ; INFN, Genoa) ; Castelli, F (Insubria U., Como ; Milan U.) et al.
he AEgIS experiment at CERN’s Antiproton Decelerator (AD) aims at performing a direct measurement of the gravitational force on antimatter to probe the Weak Equivalence Principle of General Relativity with antimatter. The idea is to measure the vertical displacement of a cold antihydrogen beam, due to the gravitational force, by using a moiré deflectometer. [...]
ARISF, 2016 - 4 p.
- Published in : (2016) , pp. 161-164
Published version: PDF;
In : 51st Rencontres de Moriond on Cosmology, La Thuile, Italy, 19 - 26 Mar 2016, pp.161-164
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9.
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Measurement of antiproton annihilation on Cu, Ag and Au with emulsion films
/ Aghion, S. (Milan Polytechnic ; INFN, Milan) ; Amsler, C. (Bern U., LHEP ; Stefan Meyer Inst. Subatomare Phys.) ; Ariga, A. (Bern U., LHEP) ; Ariga, T. (Bern U., LHEP) ; Bonomi, G. (INFM, Brescia ; INFN, Pavia) ; Bräunig, P. (Kirchhoff Inst. Phys.) ; Brusa, R.S. (INFN, Padua ; Trento U. ; INFN, Trento) ; Cabaret, L. (LAC, Orsay) ; Caccia, M. (INFN, Milan ; Insubria U., Como) ; Caravita, R. (Genoa U. ; INFN, Genoa) et al.
The characteristics of low energy antiproton annihilations on nuclei (e.g. hadronization and product multiplicities) are not well known, and Monte Carlo simulation packages that use different models provide different descriptions of the annihilation events. [...]
arXiv:1701.06306.-
2017-04-19 - 12 p.
- Published in : JINST 12 (2017) P04021
Fulltext: arXiv:1701.06306 - PDF; 10.1088_1748-0221_12_04_P04021 - PDF;
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10.
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The AEgIS Experiment
/ Knecht, A (CERN) ; Aghion, S (Milan Polytechnic) ; Ahlen, O (CERN) ; Amsler, C (Bern U., LHEP) ; Ariga, A (Bern U., LHEP) ; Ariga, T (Bern U., LHEP) ; Belov, A S (Moscow, INR) ; Bonomi, G (INFM, Brescia ; INFN, Pavia) ; Bräunig, P (Kirchhoff Inst. Phys.) ; Bremer, J (CERN) et al.
The AEgIS experiment aims at performing the first test of the Weak Equivalence Principle of General Relativity in the antimatter sector by measuring the gravitational acceleration acting on a beam of cold antihydrogen to a precision of 1%. The installation of the apparatus is making good progress and large parts were taken into operation. [...]
2014 - 11 p.
- Published in : Hyperfine Interact. 228 (2014) 121-131
In : 11th International Conference on Low Energy Antiproton Physics, Uppsala, Sweden, 10 - 15 Jun 2013, pp.121-131
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