NDLI: Measuring the gravitational free-fall of antihydrogen

Content Provider	Springer Nature Link
Author	Storey, J. Aghion, S. Ahlén, O. Amsler, C. Ariga, A. Ariga, T. Belov, A. S. Bomi, G. Bräunig, P. Bremer, J. S. Brusa, R. Cabaret, L. Canali, C. Caravita, R. Castelli, F. Cerchiari, G. Cialdi, S. Comparat, D. Consolati, G. Derking, J. H. Domizio, S. Di to, L. Di Doser, M. Dudarev, A. Ereditato, A. Ferragut, R. Fontana, A. Geva, P. Giammarchi, M. Gligorova, A. Gninenko, S. N. Haider, S. Hogan, S. D. Huse, T. Jordan, E. Jørgensen, L. V. Kaltenbacher, T. Kawada, J. Kellerbauer, A. Kimura, M. Knecht, A. Krasnický, D. Lagomarsi, V. Lehner, S. Malbrut, C. Mariazzi, S. Matveev, V. A. Merkt, F. Moia, F. Nebbia, G. Nédélec, P. Oberthaler, M. K. Pacifico, N. Petráček, V. Pistillo, C. Prelz, F. Prevedelli, M. Regenfus, C. Riccardi, C. Røhne, O. Rotondi, A. Sandaker, H. Scampoli, P. Subieta Vasquez, M. A. Špaček, M. Testera, G. Trezzi, D. Vaccarone, R. Widmann, E. Zavatarelli, S. Zmeskal, J.
Copyright Year	2014
Abstract	Antihydrogen holds the promise to test, for the first time, the universality of free-fall with a system composed entirely of antiparticles. The AEgIS experiment at CERN’s antiproton decelerator aims to measure the gravitational interaction between matter and antimatter by measuring the deflection of a beam of antihydrogen in the Earths gravitational field ( $\overline {\mathrm {g}}$ ). The principle of the experiment is as follows: cold antihydrogen atoms are synthesized in a Penning-Malberg trap and are Stark accelerated towards a moiré deflectometer, the classical counterpart of an atom interferometer, and annihilate on a position sensitive detector. Crucial to the success of the experiment is the spatial precision of the position sensitive detector. We propose a novel free-fall detector based on a hybrid of two technologies: emulsion detectors, which have an intrinsic spatial resolution of 50 nm but no temporal information, and a silicon strip / scintillating fiber tracker to provide timing and positional information. In 2012 we tested emulsion films in vacuum with antiprotons from CERN’s antiproton decelerator. The annihilation vertices could be observed directly on the emulsion surface using the microscope facility available at the University of Bern. The annihilation vertices were successfully reconstructed with a resolution of 1–2 μmon the impact parameter. If such a precision can be realized in the final detector, Monte Carlo simulations suggest of order 500 antihydrogen annihilations will be sufficient to determine $\overline {\mathrm {g}}$ with a 1 % accuracy. This paper presents current research towards the development of this technology for use in the AEgIS apparatus and prospects for the realization of the final detector.
Starting Page	151
Ending Page	157
Page Count	7
File Format	PDF
ISSN	03043843
Journal	Hyperfine Interactions
Volume Number	228
Issue Number	1-3
e-ISSN	15729540
Language	English
Publisher	Springer International Publishing
Publisher Date	2014-05-07
Publisher Place	Cham
Access Restriction	Subscribed
Subject Keyword	Antihydrogen Gravity AegIS Emulsions Nuclear Physics, Heavy Ions, Hadrons Atomic, Molecular, Optical and Plasma Physics Condensed Matter Physics Surfaces and Interfaces, Thin Films
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Atomic and Molecular Physics, and Optics Physical and Theoretical Chemistry Condensed Matter Physics

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