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Jeffrey S. Hangst

Observation of the 1S-2S transition in trapped antihydrogen

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DOI

  • Michael Ahmadi, Univ Liverpool
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  • Bruno Ximenez Rodrigues Alves
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  • J.C. Baker, Univ Coll Swansea, Swansea University, Coll Sci, Dept Phys
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  • W. Bertsche, Sci Tech Daresbury
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  • E. Butler, CERN
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  • A. Capra, TRIUMF
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  • C. Carruth, Univ Calif Berkeley, University of California Berkeley, University of California System, Dept Phys
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  • C. L. Cesar, Univ Fed Rio de Janeiro, Universidade Federal do Rio de Janeiro, Universidade Federal do Rio de Janeiro, Museu Nacl
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  • M. Charlton, Univ Coll Swansea, Swansea University, Coll Sci, Dept Phys
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  • S Cohen, Ben Gurion Univ Negev, Ben Gurion University, Blaustein Inst Desert Res, Mitrani Dept Desert Ecol
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  • R. Collister, TRIUMF
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  • S. Eriksson, Univ Coll Swansea, Swansea University, Coll Sci, Dept Phys
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  • A. Evans, Univ Calgary, University of Calgary, Dept Radiol
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  • N. Evetts, Univ British Columbia, University of British Columbia, Dept Anthropol
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  • J. Fajans, Univ Calif Berkeley, University of California Berkeley, University of California System, Dept Phys
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  • T. Friesen
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  • M. C. Fujiwara, TRIUMF
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  • R. D. Gill, TRIUMF
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  • A. Gutierrez, UCL
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  • J. S. Hangst
  • W. N. Hardy, Univ British Columbia, University of British Columbia, Dept Anthropol
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  • M. E. Hayden, Simon Fraser Univ, Simon Fraser University
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  • C.A. Isaac, Univ Coll Swansea, Swansea University, Coll Sci, Dept Phys
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  • A. Ishida, Univ Tokyo
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  • M. A. J. Ohnson, Sci Tech Daresbury
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  • S. A. J. Ones, Univ Coll Swansea, Swansea University, Coll Sci, Dept Phys
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  • S. J. Onsell, Stockholm Univ, SE-10691 Stockholm
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  • L. Kurchaninov, TRIUMF
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  • N. Madsen, Fisk Univ, Dept Phys, Coll Food Sci & Nutr Engn, Univ Coll Swansea, Swansea University, Coll Sci, Dept Phys
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  • M. Mathers, York Univ, York University - Canada, Dept Biol
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  • Dustin Maxwell, Univ Coll Swansea, Swansea University, Coll Sci, Dept Phys
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  • J.T.K. McKenna, TRIUMF
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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, Univ British Columbia, University of British Columbia, Dept Anthropol
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  • J. J. . Munich, Simon Fraser Univ, Simon Fraser University
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  • P. Nolan, Univ Liverpool
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  • K. Olchanski, TRIUMF
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  • A. Olin, Univ. of Victoria
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  • P. Pusa, Univ Liverpool
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  • C. O. Rasmussen, Texas Christian Univ, Texas Christian University, Dept Phys & Astron
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  • F. Robicheaux, Purdue Univ, Purdue University, Purdue University System, Dept Agron
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  • R.L. Sacramento, Univ Fed Rio de Janeiro, Universidade Federal do Rio de Janeiro, Universidade Federal do Rio de Janeiro, Museu Nacl
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  • M. Sameed, Univ Coll Swansea, Swansea University, Coll Sci, Dept Phys
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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 Federal do Rio de Janeiro, Museu Nacl
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  • S. Stracka, Sez INFN Pisa
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  • G. Stutter
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  • C So, Univ Calgary, University of Calgary, Dept Radiol
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  • T. D. Tharp, Fisk Univ, Dept Phys, Marquette Univ
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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 Radiol
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  • D. P. van der Werf, CEA Saclay
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  • J. S. Wurtele, Univ Calif Berkeley, University of California Berkeley, University of California System, Dept Phys

The spectrum of the hydrogen atom has played a central part in fundamental physics over the past 200 years. Historical examples of its importance include the wavelength measurements of absorption lines in the solar spectrum by Fraunhofer, the identification of transition lines by Balmer, Lyman and others, the empirical description of allowed wavelengths by Rydberg, the quantum model of Bohr, the capability of quantum electrodynamics to precisely predict transition frequencies, and modern measurements of the 1S-2S transition by Hansch1 to a precision of a few parts in 10(15). Recent technological advances have allowed us to focus on antihydrogen-the antimatter equivalent of hydrogen(2-4). The Standard Model predicts that there should have been equal amounts of matter and antimatter in the primordial Universe after the Big Bang, but today's Universe is observed to consist almost entirely of ordinary matter. This motivates the study of antimatter, to see if there is a small asymmetry in the laws of physics that govern the two types of matter. In particular, the CPT (charge conjugation, parity reversal and time reversal) theorem, a cornerstone of the Standard Model, requires that hydrogen and antihydrogen have the same spectrum. Here we report the observation of the 1S-2S transition in magnetically trapped atoms of antihydrogen. We determine that the frequency of the transition, which is driven by two photons from a laser at 243 nanometres, is consistent with that expected for hydrogen in the same environment. This laser excitation of a quantum state of an atom of antimatter represents the most precise measurement performed on an anti-atom. Our result is consistent with CPT invariance at a relative precision of about 2 x 10(-10).

OriginalsprogEngelsk
TidsskriftNature
Vol/bind541
Nummer7638
Sider (fra-til)506-510
Antal sider7
ISSN0028-0836
DOI
StatusUdgivet - 26 jan. 2017

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