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Jeffrey S. Hangst

Observation of the hyperfine spectrum of antihydrogen

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DOI

  • M. Ahmadi, University of Liverpool
  • ,
  • B. X. R. Alves
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  • C. J. Baker, Swansea University
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  • W. Bertsche, STFC Daresbury Laboratory
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  • E. Butler, Univ Geneva, University of Geneva, Observ Geneva
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  • A. Capra, University of British Columbia
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  • C. Carruth, University of California Berkeley
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  • C. L. Cesar, Univ Fed Rio de Janeiro, Universidade Federal do Rio de Janeiro, Universidade do Estado do Rio de Janeiro, Inst Fis
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  • M. Charlton, Swansea University
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  • S. Cohen, Ben-Gurion University
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  • R. Collister, University of British Columbia
  • ,
  • S. Eriksson, Swansea University
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  • A. Evans, Univ Calgary, University of Calgary, Dept Archaeol
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  • N. Evetts, University of British Columbia
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  • J. Fajans, University of California Berkeley
  • ,
  • T. Friesen
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  • M. C. Fujiwara, University of British Columbia
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  • D. R. Gill, University of British Columbia
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  • A. Gutierrez, University College London, London
  • ,
  • J. S. Hangst
  • W. N. Hardy, University of British Columbia
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  • M. E. Hayden, Simon Fraser Univ, Simon Fraser University
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  • C. A. Isaac, Swansea University
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  • A. Ishida, Tokyo University
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  • M. A. Johnson, Monash Univ, Monash University, Sch Phys & Astron, Univ Manchester, University of Manchester, Sch Environm Educ & Dev, Geog, Manchester University, Manchester, UK., Cockcroft Inst, STFC Daresbury Laboratory, Sci Tech Daresbury, STFC Daresbury Laboratory
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  • S. A. Jones, Coll Food Sci & Nutr Engn, Fisk Univ, Dept Phys, Univ Coll Swansea, Swansea University, Coll Sci, Dept Phys, Swansea University
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  • S. Jonsell, Stockholm University
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  • L. Kurchaninov, University of British Columbia
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  • N. Madsen, Coll Food Sci & Nutr Engn, Fisk Univ, Dept Phys, Univ Coll Swansea, Swansea University, Coll Sci, Dept Phys, Swansea University
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  • M. Mathers, York Univ, York University - Canada, Dept Biol
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  • D. Maxwell, Swansea University
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  • J. T. K. McKenna, University of British Columbia
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  • S. Menary, York Univ, York University - Canada, Dept Biol
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  • J. M. Michan, École Polytechnique Fédérale de Lausanne
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  • T. Momose, University of British Columbia
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  • J. J. Munich, Simon Fraser Univ, Simon Fraser University
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  • P. Nolan, University of Liverpool
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  • K. Olchanski, University of British Columbia
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  • A. Olin, University of Victoria
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  • P. Pusa, University of Liverpool
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  • C. O. Rasmussen
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  • F. Robicheaux, Purdue Univ, Purdue University, Purdue University System, Dept Phys
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  • R. L. Sacramento, Univ Estadual Paulista, Universidade Estadual Paulista, UNESP, Inst Fis Teor, Univ Fed Rio de Janeiro, Universidade Federal do Rio de Janeiro, Universidade do Estado do Rio de Janeiro, Inst Fis, Universidade Federal do Rio de Janeiro
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  • M. Sameed, Swansea University
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  • E. Sarid, Soreq NRC
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  • D. M. Silveira, Univ Fed Rio de Janeiro, Universidade Federal do Rio de Janeiro, Universidade do Estado do Rio de Janeiro, Inst Fis
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  • S. Stracka, Sez INFN Pisa
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  • G. Stutter
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  • C. So
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  • T. D. Tharp, Fisk Univ, Dept Phys, Marquette Univ, Marquette University
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  • J. E. Thompson, York Univ, York University - Canada, Dept Biol
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  • R. I. Thompson, Univ Calgary, University of Calgary, Dept Archaeol
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  • D. P. Van der Werf, Univ Paris 11, Universite Paris Saclay (ComUE), University of Paris Sud - Paris XI, Inst Astrophys Spatiale
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  • J. S. Wurtele, University of California Berkeley

The observation of hyperfine structure in atomic hydrogen by Rabi and co-workers(1-3) and the measurement(4) of the zero-field ground-state splitting at the level of seven parts in 10(13) are important achievements of mid-twentieth-century physics. The work that led to these achievements also provided the first evidence for the anomalous magnetic moment of the electron(5-8), inspired Schwinger's relativistic theory of quantum electrodynamics(9,10) and gave rise to the hydrogen maser(11), which is a critical component of modern navigation, geo-positioning and very-long-baseline interferometry systems. Research at the Antiproton Decelerator at CERN by the ALPHA collaboration extends these enquiries into the antimatter sector. Recently, tools have been developed that enable studies of the hyperfine structure of antihydrogen(12)-the antimatter counterpart of hydrogen. The goal of such studies is to search for any differences that might exist between this archetypal pair of atoms, and thereby to test the fundamental principles on which quantum field theory is constructed. Magnetic trapping of antihydrogen atoms(13,14) provides a means of studying them by combining electromagnetic interaction with detection techniques that are unique to antimatter(12,15). Here we report the results of a microwave spectroscopy experiment in which we probe the response of antihydrogen over a controlled range of frequencies. The data reveal clear and distinct signatures of two allowed transitions, from which we obtain a direct, magnetic-field-independent measurement of the hyperfine splitting. From a set of trials involving 194 detected atoms, we determine a splitting of 1,420.4 +/- 0.5 megahertz, consistent with expectations for atomic hydrogen at the level of four parts in 10(4). This observation of the detailed behaviour of a quantum transition in an atom of antihydrogen exemplifies tests of fundamental symmetries such as charge-parity-time in antimatter, and the techniques developed here will enable more-precise such tests.

OriginalsprogEngelsk
TidsskriftNature
Vol/bind548
Nummer7665
Sider (fra-til)66-69
Antal sider5
ISSN0028-0836
DOI
StatusUdgivet - 3 aug. 2017

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