The validity of the Weak Equivalence Principle (WEP) as predicted by General Relativity has been tested up to astounding precision using ordinary matter. The lack hitherto of a stable source of a probe being at the same time electrically neutral, cold and stable enough to be measured has prevented high-accuracy testing of the WEP on anti-matter. The AE g¯ IS (Antimatter Experiment: Gravity, Interferometry, Spectroscopy) experiment located at CERN's AD (Antiproton Decelerator) facility aims at producing such a probe in the form of a pulsed beam of cold anti-hydrogen, and at measuring by means of a moiré deflectometer the gravitational force that Earth's mass exerts on it. Low temperature and abundance of the H¯ are paramount to attain a high precision measurement. A technique employing a charge-exchange reaction between antiprotons coming from the AD and excited positronium atoms is being developed at AE g¯ IS and will be presented hereafter, alongside an overview of the experimental apparatus and the current status of the experiment.

AEgIS ¯ latest results / F. Guatieri, S. Aghion, C. Amsler, G. Angela, G. Bonomi, R.S. Brusa, M. Caccia, R. Caravita, F. Castelli, G. Cerchiari, D. Comparat, G. Consolati, A. Demetrio, L. Di Noto, M. Doser, C. Evans, M. Fani, R. Ferragut, J. Fesel, A. Fontana, S. Gerber, M. Giammarchi, A. Gligorova, S. Haider, A. Hinterberger, H. Holmestad, A. Kellerbauer, D. Krasnicky, V. Lagomarsino, P. Lansonneur, P. Lebrun, C. Malbrunot, S. Mariazzi, V. Matveev, Z. Mazzotta, S.R. Muller, G. Nebbia, P. Nedelec, M. Oberthaler, N. Pacifico, D. Pagano, L. Penasa, V. Petracek, F. Prelz, M. Prevedelli, B. Rienaecker, J. Robert, O.M. Rhne, A. Rotondi, M. Sacerdoti, H. Sandaker, R. Santoro, M. Simon, L. Smestad, F. Sorrentino, G. Testera, I.C. Tietje, E. Widmann, P. Yzombard, C. Zimmer, J. Zmeskal, N. Zurlo. - In: EPJ WEB OF CONFERENCES. - ISSN 2101-6275. - 181(2018), pp. 37.1-37.7. ((Intervento presentato al convegno International Conference on Exotic Atoms and Related Topics (EXA) tenutosi a Wien nel 2017 [10.1051/epjconf/201818101037].

AEgIS ¯ latest results

Castelli F.;Giammarchi M.;Mazzotta Z.;Prelz F.;Sacerdoti M.;
2018

Abstract

The validity of the Weak Equivalence Principle (WEP) as predicted by General Relativity has been tested up to astounding precision using ordinary matter. The lack hitherto of a stable source of a probe being at the same time electrically neutral, cold and stable enough to be measured has prevented high-accuracy testing of the WEP on anti-matter. The AE g¯ IS (Antimatter Experiment: Gravity, Interferometry, Spectroscopy) experiment located at CERN's AD (Antiproton Decelerator) facility aims at producing such a probe in the form of a pulsed beam of cold anti-hydrogen, and at measuring by means of a moiré deflectometer the gravitational force that Earth's mass exerts on it. Low temperature and abundance of the H¯ are paramount to attain a high precision measurement. A technique employing a charge-exchange reaction between antiprotons coming from the AD and excited positronium atoms is being developed at AE g¯ IS and will be presented hereafter, alongside an overview of the experimental apparatus and the current status of the experiment.
Settore FIS/04 - Fisica Nucleare e Subnucleare
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/714760
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