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Production and detection of cold antihydrogen atoms

M Amoretti, C Amsler, G Bonomi, A Bouchta, P Bowe, C Carraro, C. L Cesar, M Charlton, M. J. T Collier, M Doser, V Filippini, K. S Fine, A Fontana, M. C Fujiwara, R Funakoshi, P Genova, J. S Hangst, R. S Hayano, M. H Holzscheiter, L. V Jørgensen, V Lagomarsino, R Landua, D Lindelöf, E. Lodi Rizzini, M Macrì, N Madsen, G Manuzio, M Marchesotti, P Montagna, H Pruys, C Regenfus, P Riedler, J Rochet, A Rotondi, G Rouleau, G Testera, A Variola, T. L Watson, D. P. van der Werf, Dirk van der Werf Orcid Logo, Niels Madsen Orcid Logo

Nature, Volume: 419, Issue: 6906, Pages: 456 - 459

Swansea University Authors: Dirk van der Werf Orcid Logo, Niels Madsen Orcid Logo

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DOI (Published version): 10.1038/nature01096

Abstract

A theoretical underpinning of the standard model of fundamental particles and interactions is CPT invariance, which requires that the laws of physics be invariant under the combined discrete operations of charge conjugation, parity and time reversal. Antimatter, the existence of which was predicted...

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Published in: Nature
ISSN: 0028-0836
Published: 2002
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa15105
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Abstract: A theoretical underpinning of the standard model of fundamental particles and interactions is CPT invariance, which requires that the laws of physics be invariant under the combined discrete operations of charge conjugation, parity and time reversal. Antimatter, the existence of which was predicted by Dirac, can be used to test the CPT theorem—experimental investigations involving comparisons of particles with antiparticles are numerous1. Cold atoms and anti-atoms, such as hydrogen and antihydrogen, could form the basis of a new precise test, as CPT invariance implies that they must have the same spectrum. Observations of antihydrogen in small quantities and at high energies have been reported at the European Organization for Nuclear Research (CERN)2 and at Fermilab3, but these experiments were not suited to precision comparison measurements. Here we demonstrate the production of antihydrogen atoms at very low energy by mixing trapped antiprotons and positrons in a cryogenic environment. The neutral anti-atoms have been detected directly when they escape the trap and annihilate, producing a characteristic signature in an imaging particle detector.
College: Faculty of Science and Engineering
Issue: 6906
Start Page: 456
End Page: 459

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