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BASE – The Baryon Antibaryon Symmetry Experiment

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  • Published: 23 November 2015
  • volume 224, pages 3055–3108 (2015)
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BASE – The Baryon Antibaryon Symmetry Experiment
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  • C. Smorra1,2,
  • K. Blaum3,
  • L. Bojtar2,
  • M. Borchert4,
  • K.A. Franke3,
  • T. Higuchi1,5,
  • N. Leefer6,
  • H. Nagahama1,5,
  • Y. Matsuda5,
  • A. Mooser1,
  • M. Niemann4,
  • C. Ospelkaus4,8,
  • W. Quint9,10,
  • G. Schneider7,
  • S. Sellner1,
  • T. Tanaka5,
  • S. Van Gorp11,
  • J. Walz5,6,
  • Y. Yamazaki11 &
  • …
  • S. Ulmer1 

  • 1481 Accesses

  • 46 Citations

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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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Authors and Affiliations

  1. Ulmer Initiative Research Unit, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan

    C. Smorra, T. Higuchi, H. Nagahama, A. Mooser, S. Sellner & S. Ulmer

  2. CERN, 1211, Geneva 23, Switzerland

    C. Smorra & L. Bojtar

  3. Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117, Heidelberg, Germany

    K. Blaum & K.A. Franke

  4. Institute of Quantum Optics, Leibniz Universität Hannover, Welfengarten 1, 30167, Hannover, Germany

    M. Borchert, M. Niemann & C. Ospelkaus

  5. Graduate School of Arts and Sciences, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo, 153-8902, Japan

    T. Higuchi, H. Nagahama, Y. Matsuda, T. Tanaka & J. Walz

  6. Helmholtz-Institut Mainz, 55099, Mainz, Germany

    N. Leefer & J. Walz

  7. Institut für Physik, Johannes Gutenberg-Universität Mainz, 55099, Mainz, Germany

    G. Schneider

  8. Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116, Braunschweig, Germany

    C. Ospelkaus

  9. GSI-Helmholtzzentrum für Schwerionenforschung, 64291, Darmstadt, Germany

    W. Quint

  10. Ruprecht-Karls-Universität Heidelberg, 69047, Heidelberg, Germany

    W. Quint

  11. Atomic Physics Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan

    S. Van Gorp & Y. Yamazaki

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  1. C. Smorra
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  2. K. Blaum
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  20. S. Ulmer
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Correspondence to C. Smorra.

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Smorra, C., Blaum, K., Bojtar, L. et al. BASE – The Baryon Antibaryon Symmetry Experiment. Eur. Phys. J. Spec. Top. 224, 3055–3108 (2015). https://doi.org/10.1140/epjst/e2015-02607-4

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  • Received: 21 September 2015

  • Revised: 01 October 2015

  • Published: 23 November 2015

  • Issue Date: November 2015

  • DOI: https://doi.org/10.1140/epjst/e2015-02607-4

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Keywords

  • European Physical Journal Special Topic
  • Cyclotron Frequency
  • Antihydrogen
  • Axial Frequency
  • Trap Electrode

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