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Jeffrey S. Hangst

Discriminating between antihydrogen and mirror-trapped antiprotons in a minimum-B trap

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  • C. Amole, York University, Canada
  • G.B. Andresen
  • M.D. Ashkezari, Simon Fraser University, Canada
  • M. Baquero-Ruiz, University of California at Berkeley, USA
  • W. Bertsche, Swansea University, Storbritannien
  • E. Butler, Swansea University, Storbritannien
  • C.L. Cesar, Universidade Federal do Rio de Janeiro, Brasilien
  • S. Chapman, University of California at Berkeley, USA
  • M. Charlton, Swansea University, Storbritannien
  • A. Deller, Swansea University, Storbritannien
  • S. Eriksson, Swansea University, Storbritannien
  • J. Fajans, University of California at Berkeley, USA
  • T. Friesen, University of Calgary, Canada
  • M.C. Fujiwara, TRUMF, 4004 Wesbrook Mall, Canada
  • D.R. Gill, TRUMF, 4004 Wesbrook Mall, Canada
  • A. Gutierrez, University of British Columbia, Canada
  • J.S. Hangst
  • W.N. Hardy, University of British Columbia, Canada
  • M.E. Hayden, Simon Fraser University, Canada
  • A.J. Humphries, Swansea University, Storbritannien
  • R. Hydomako, University of Calgary, Canada
  • L. Kurchaninov, TRIUMF, 4004 Wesbrook Mall, Canada
  • S. Jonsell, Stockholm University, Sverige
  • N. Madsen, Swansea University, Storbritannien
  • S. Menary, York University, Canada
  • P. Nolan, University of Liverpool, Storbritannien
  • K. Olchanski, TRIUMF, 4004 Wesbrook Mall, Canada
  • A. Olin, TRIUMF, 4004 Wesbrook Mall, Canada
  • A. Povilus, University of California at Berkeley, USA
  • P. Pusa, University of Liverpool, Storbritannien
  • F. Robicheaux, Auburn University, USA
  • E. Sarid, NRCN-Nuclear Research Center Negev, Israel
  • D.M. Silveira, Universidade Federal do Rio de Janeiro, Brasilien
  • C. So, University of California at Berkeley, USA
  • J.W. Storey, TRIUMF, 4004 Wesbrook Mall, Canada
  • R.I. Thompson, University of Calgary, Canada
  • D.P. Van Der Werf, Swansea University, Storbritannien
  • J.S. Wurtele, University of California at Berkeley, USA
Recently, antihydrogen atoms were trapped at CERN in a magnetic minimum (minimum-B) trap formed by superconducting octupole and mirror magnet coils. The trapped antiatoms were detected by rapidly turning off these magnets, thereby eliminating the magnetic minimum and releasing any antiatoms contained in the trap. Once released, these antiatoms quickly hit the trap wall, whereupon the positrons and antiprotons in the antiatoms annihilate. The antiproton annihilations produce easily detected signals; we used these signals to prove that we trapped antihydrogen. However, our technique could be confounded by mirror-trapped antiprotons, which would produce seemingly identical annihilation signals upon hitting the trap wall. In this paper, we discuss possible sources of mirror-trapped antiprotons and show that antihydrogen and antiprotons can be readily distinguished, often with the aid of applied electric fields, by analyzing the annihilation locations and times. We further discuss the general properties of antiproton and antihydrogen trajectories in this magnetic geometry, and reconstruct the antihydrogen energy distribution from the measured annihilation time history.
OriginalsprogEngelsk
TidsskriftNew Journal of Physics
Vol/bind14
Sider (fra-til)015010
Antal sider35
ISSN1367-2630
DOI
StatusUdgivet - 1 jan. 2012

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