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The European Physical Journal Special Topics

, Volume 224, Issue 16, pp 3055–3108 | Cite as

BASE – The Baryon Antibaryon Symmetry Experiment

  • C. SmorraEmail author
  • K. Blaum
  • L. Bojtar
  • M. Borchert
  • K.A. Franke
  • T. Higuchi
  • N. Leefer
  • H. Nagahama
  • Y. Matsuda
  • A. Mooser
  • M. Niemann
  • C. Ospelkaus
  • W. Quint
  • G. Schneider
  • S. Sellner
  • T. Tanaka
  • S. Van Gorp
  • J. Walz
  • Y. Yamazaki
  • S. Ulmer
Open Access
Review
First Online:
Part of the following topical collections:
  1. BASE - The Baryon Antibaryon Symmetry Experiment

Abstract

The Baryon Antibaryon Symmetry Experiment (BASE) aims at performing a stringent test of the combined charge parity and time reversal (CPT) symmetry by comparing the magnetic moments of the proton and the antiproton with high precision. Using single particles in a Penning trap, the proton/antiproton g-factors, i.e. the magnetic moment in units of the nuclear magneton, are determined by measuring the respective ratio of the spin-precession frequency to the cyclotron frequency. The spin precession frequency is measured by non-destructive detection of spin quantum transitions using the continuous Stern-Gerlach effect, and the cyclotron frequency is determined from the particle*s motional eigenfrequencies in the Penning trap using the invariance theorem. By application of the double Penning-trap method we expect that in our measurements a fractional precision of δg/g 10−9 can be achieved. The successful application of this method to the antiproton will consist a factor 1000 improvement in the fractional precision of its magnetic moment. The BASE collaboration has constructed and commissioned a new experiment at the Antiproton Decelerator (AD) of CERN. This article describes and summarizes the physical and technical aspects of this new experiment.

Keywords

European Physical Journal Special Topic Cyclotron Frequency Antihydrogen Axial Frequency Trap Electrode 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© EDP Sciences and Springer 2015

Authors and Affiliations

  • C. Smorra
    • 1
    • 2
    Email author
  • K. Blaum
    • 3
  • L. Bojtar
    • 2
  • M. Borchert
    • 4
  • K.A. Franke
    • 3
  • T. Higuchi
    • 1
    • 5
  • N. Leefer
    • 6
  • H. Nagahama
    • 1
    • 5
  • Y. Matsuda
    • 5
  • A. Mooser
    • 1
  • M. Niemann
    • 4
  • C. Ospelkaus
    • 4
    • 8
  • W. Quint
    • 9
    • 10
  • G. Schneider
    • 7
  • S. Sellner
    • 1
  • T. Tanaka
    • 5
  • S. Van Gorp
    • 11
  • J. Walz
    • 5
    • 6
  • Y. Yamazaki
    • 11
  • S. Ulmer
    • 1
  1. 1.Ulmer Initiative Research Unit, RIKENWakoJapan
  2. 2.CERNGeneva 23Switzerland
  3. 3.Max-Planck-Institut für KernphysikHeidelbergGermany
  4. 4.Institute of Quantum Optics, Leibniz Universität HannoverHannoverGermany
  5. 5.Graduate School of Arts and Sciences, University of TokyoMeguro-ku, TokyoJapan
  6. 6.Helmholtz-Institut MainzMainzGermany
  7. 7.Institut für Physik, Johannes Gutenberg-Universität MainzMainzGermany
  8. 8.Physikalisch-Technische BundesanstaltBraunschweigGermany
  9. 9.GSI-Helmholtzzentrum für SchwerionenforschungDarmstadtGermany
  10. 10.Ruprecht-Karls-Universität HeidelbergHeidelbergGermany
  11. 11.Atomic Physics Laboratory, RIKENWakoJapan

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