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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. Smorra
  • 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
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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.

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Copyright information

© EDP Sciences and Springer 2015

Authors and Affiliations

  • C. Smorra
    • 1
    • 2
  • 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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