Exploring the WEP with a pulsed cold beam of antihydrogen

Doser, M.; Amsler, C.; Белов, А. С.; Bonomi, G.; Bräunig, P.; Bremer, J.; Brusa, R. S.; Burkhart, G; Cabaret, L.; Canali, C.; Castelli, F.; Chlouba, K.; Cialdi, S.; Comparat, D.; Consolati, G.; Noto, L. Di; Donzella, A.; Dudarev, A.; Eisel, T.; Ferragut, R.; Ferrari, G.; Fontana, A.; Genova, P.; Giammarchi, M.; Gligorova, A.; Gninenko, S.; Haider, S.; Hansen, J. P.; Hogan, Stephen; Jørgensen, L. V.; Kaltenbacher, T.; Kellerbauer, A.; Krasnický, D.; Lagomarsino, V.; Mariazzi, S.; Matveev, V.; Merkt, Frédéric; Moia, F.; Nebbia, G.; Nédélec, P.; Oberthaler, Markus K.; Perini, D.; Petráček, V.; Prelz, F.; Prevedelli, M.; Regenfus, C.; Riccardi, C.; Røhne, O.; Rotondi, A.; Sacerdoti, M.; Sandaker, H.; Špaček, M.; Storey, J. W.; Testera, G.; Tokareva, Anna; Trezzi, D.; Vaccarone, R.; Villa, F.; Zavatarelli, Z; Zenoni, A.

doi:10.1088/0264-9381/29/18/184009

Cited by 98 publications

(68 citation statements)

References 28 publications

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“…A direct measurement of the gravitational free fall of antimatter atoms, or matter-antimatter neutral systems such as Ps, is foreseen as a test for speculative models aiming to describe the observed asymmetry between matter and antimatter in the universe by a gravitational asymmetry [12]. Specifically, for pursuing this objective, measurements made on Ps atoms are complementary to other experiments currently commissioning or running [13][14][15][16] employing antihydrogen; in the former case one expects that the possible absence of a free fall can be a clear signature of an antigravity component in the gravitational interaction violating the weak equivalence principle. Experimental proposals currently under evaluation are based on detecting the free fall of Ps atoms, either by guiding a Rydberg Ps beam towards a position-sensitive detector with electrostatic potentials [17] or by accurately measuring the vertical displacement of the atoms' trajectory with a matter-wave optical interferometer [18] or with a matter-wave mechanical interferometer in a novel TalbotLau configuration for increased compactness [19].…”

Section: S-2mentioning

confidence: 99%

“…Laser excitation to long-lived Rydberg levels has been the first studied solution to overcoming the lifetime limitation [16,17]. This promising route, however, has some potential limitations.…”

Section: S-2mentioning

confidence: 99%

“…Laser excitation of the 3 3 P Ps levels manifold by UV pulses was recently achieved [25] in the framework of the AEgIS experimental program devoted to antihydrogen synthesis for gravitational studies [16]. In this work we used the same apparatus to demonstrate the feasibility of producing a source of metastable or long-lived Ps atoms.…”

Section: S-2mentioning

confidence: 99%

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Producing long-lived 23S positronium via 33P laser excitation in magnetic and electric

Aghion¹,

Amsler²,

Antonello³

et al. 2018

Phys. Rev. A

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Producing positronium (Ps) in the metastable 2 3 S state is of interest for various applications in fundamental physics. We report here on an experiment in which Ps atoms are produced in this long-lived state by spontaneous radiative decay of Ps excited to the 3 3 P level manifold. The Ps cloud excitation is obtained with a UV laser pulse in an experimental vacuum chamber in presence of guiding magnetic field of 25 mT and an average electric field of 300 V cm −1 . The evidence of the 2 3 S state production is obtained to the 3.6σ level of statistical significance using a novel analysis technique of the single-shot positronium annihilation lifetime spectra. The dynamic of the Ps population on the involved levels has been studied with a rate equation model.

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Section: S-2mentioning

confidence: 99%

Section: S-2mentioning

confidence: 99%

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Producing long-lived 23S positronium via 33P laser excitation in magnetic and electric

Aghion¹,

Amsler²,

Antonello³

et al. 2018

Phys. Rev. A

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“…The only antiatom which will be most likely possible to investigate in the next future is antihydrogen,H. In particular, a measurement of the gravitational acceleration g onH, even with a few percent precision, would be scientifically relevant, as it would represent the first direct measurement of the gravitational interaction between matter and antimatter [6].…”

Section: Introductionmentioning

confidence: 99%

Positronium for Antihydrogen Production in the AEGIS Experiment

et al. 2017

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“…Its main goal is to measure for the first time the force acting on H atoms in the gravitational field of the earth [16]. The experiment is based on the creation of a cold, bunched beam of H and the measurement of its vertical displacement after a substantial horizontal flight, as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Probing antimatter gravity – The AEGIS experiment at CERN

Kellerbauer¹,

Aghion²,

Amsler³

et al. 2016

EPJ Web Conf.

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Abstract. 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. The AEGIS experiment will measure the gravitational acceleration of antihydrogen to ultimately 1% precision. For this purpose, a pulsed horizontal antihydrogen beam with a velocity of several 100 m s −1 will be produced. Its vertical deflection due to gravity will be detected by a setup consisting of material gratings coupled with a position-sensitive detector, operating as a moiré deflectometer or an atom interferometer. The AEGIS experiment is installed at CERN's Antiproton Decelerator, currently the only facility in the world which produces copious amounts of low-energy antiprotons. The construction of the setup has been going on since 2010 and is nearing completion. A proof-of-principle experiment with antiprotons has demonstrated that the deflection of antiparticles by a few μm due to an external force can be detected. Technological and scientific development pertaining to specific challenges of the experiment, such as antihydrogen formation by positronium charge exchange or the position-sensitive detection of antihydrogen annihilations, is ongoing.

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Exploring the WEP with a pulsed cold beam of antihydrogen

Abstract: Exploring the WEP with a pulsed cold beam of antihydrogen View the table of contents for this issue, or go to the journal homepage for more 2012 Class. Quantum Grav. 29 184009

Cited by 98 publications

References 28 publications

Producing long-lived 23S positronium via 33P laser excitation in magnetic and electric

Producing long-lived 23S positronium via 33P laser excitation in magnetic and electric

Positronium for Antihydrogen Production in the AEGIS Experiment

Probing antimatter gravity – The AEGIS experiment at CERN

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