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Jeffrey S. Hangst

Resonant quantum transitions in trapped antihydrogen atoms

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  • C. Amole, York University
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  • M.D. Ashkezari, Simon Fraser University
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  • M. Baquero-Ruiz, University of California
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  • W. Bertsche, Swansea University
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  • P.D. Bowe, Danmark
  • E. Butler
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  • A. Capra, York University
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  • C.L. Cesar, Universidade Federal do Rio de Janeiro
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  • M. Charlton, Swansea University
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  • A. Deller, Swansea University
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  • P.H. Donnan, Auburn University
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  • S. Eriksson, Swansea University
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  • J. Fajans, University of California
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  • T. Friesen, University of Calgary
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  • M.C. Fujiwara, University of Calgary
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  • D.R. Gill, TRIUMF
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  • A. Gutierrez, University of British Columbia
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  • J.S. Hangst
  • W.N. Hardy, University of British Columbia
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  • M.E. Hayden, Simon Fraser University
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  • A.J. Humphries, Swansea University
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  • C.A. Isaac, Swansea University
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  • S. Jonsell, Stockholm University
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  • L. Kurchaninov, TRIUMF
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  • A. Little, University of California
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  • N. Madsen, Swansea University
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  • J.T.K. McKenna, University of Liverpool
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  • S. Menary, York University
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  • S.C. Napoli, Swansea University
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  • P. Nolan, University of Liverpool
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  • K. Olchanski, TRIUMF
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  • A. Olin, TRIUMF
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  • P. Pusa, University of Liverpool
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  • C.O. Rasmussen, Danmark
  • F. Robicheaux, Auburn University
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  • E. Sarid, NRCN-Nuclear Research Center Negev
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  • C.R. Shields, Swansea University
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  • D.M. Silveira, Universidade Federal do Rio de Janeiro
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  • S. Stracka, TRIUMF
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  • C. So, University of California
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  • R.I. Thompson, University of Calgary
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  • D.P. Van Der Werf, Swansea University
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  • J.S. Wurtele, University of California
The hydrogen atom is one of the most important and influential model systems in modern physics. Attempts to understand its spectrum are inextricably linked to the early history and development of quantum mechanics. The hydrogen atom's stature lies in its simplicity and in the accuracy with which its spectrum can be measured and compared to theory. Today its spectrum remains a valuable tool for determining the values of fundamental constants and for challenging the limits of modern physics, including the validity of quantum electrodynamics and-by comparison with measurements on its antimatter counterpart, antihydrogen-the validity of CPT (charge conjugation, parity and time reversal) symmetry. Here we report spectroscopy of a pure antimatter atom, demonstrating resonant quantum transitions in antihydrogen. We have manipulated the internal spin state of antihydrogen atoms so as to induce magnetic resonance transitions between hyperfine levels of the positronic ground state. We used resonant microwave radiation to flip the spin of the positron in antihydrogen atoms that were magnetically trapped in the ALPHA apparatus. The spin flip causes trapped anti-atoms to be ejected from the trap. We look for evidence of resonant interaction by comparing the survival rate of trapped atoms irradiated with microwaves on-resonance to that of atoms subjected to microwaves that are off-resonance. In one variant of the experiment, we detect 23 atoms that survive in 110 trapping attempts with microwaves off-resonance (0.21 per attempt), and only two atoms that survive in 103 attempts with microwaves on-resonance (0.02 per attempt). We also describe the direct detection of the annihilation of antihydrogen atoms ejected by the microwaves.
OriginalsprogEngelsk
TidsskriftNature
Vol/bind483
Nummer7390
Sider (fra-til)439-443
Antal sider5
ISSN0028-0836
DOI
StatusUdgivet - 22 mar. 2012

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