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Direct Measurement of the Hyperfine Structure Interval of Positronium Using High-Power Millimeter Wave Technology

  • Book
  • © 2015

Overview

Authors:
  1. Akira Miyazaki

    1. Department of Physics, Graduate School of Science, The University of Tokyo, Tokyo, Japan

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  • Nominated as an outstanding contribution by the University of Tokyo's Physics Department in 2013
  • Describes first direct determination of the hyperfine interval of ground-state positronium and the lifetime of para-positronium
  • Introduces development of new millimeter wave devices, such as a long-time stable gyrotron with frequency tunability and a Fabry-Pérot cavity of high finesse
  • Explains precise measurement by a new millimeter wave device for measuring Ps-HFS
  • Includes supplementary material: sn.pub/extras

Part of the book series: Springer Theses (Springer Theses)

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Table of contents (5 chapters)

  1. Front Matter

    Pages i-xiii
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  2. Introduction

    • Akira Miyazaki
    Pages 1-16

  3. Experimental

    • Akira Miyazaki
    Pages 17-61

  4. Analysis

    • Akira Miyazaki
    Pages 63-85

  5. Discussion

    • Akira Miyazaki
    Pages 87-93

  6. Conclusion

    • Akira Miyazaki
    Pages 95-96

  7. Back Matter

    Pages 97-122
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Keywords

About this book

In this thesis, the author develops new high-power millimeter wave techniques for measuring the hyperfine structure of positronium (Ps-HFS) directly for the first time in the world. Indirect measurement of Ps-HFS in the literature might have systematic uncertainties related to the use of a static magnetic field. Development of the millimeter wave devices supports the precise determination of Ps-HFS by directly measuring the Breit-Wigner resonant transition from o-Ps to p-Ps without the magnetic field. At the same time, the width of the measured Breit-Wigner resonance directly provides the lifetime of p-Ps. This measurement is the first precise spectroscopic experiment involving the magnetic dipole transition and high-power millimeter waves. The development of a gyrotron and a Fabry-Pérot cavity is described as providing an effective power of over 20 kW, which is required to cause the direct transition from o-Ps to p-Ps. Those values measured by the newly developed millimeter wave device pave the way for examining the discrepancy observed between conventional indirect experiments on Ps-HFS and the theoretical predictions of Quantum Electrodynamics.

Authors and Affiliations

  • Department of Physics, Graduate School of Science, The University of Tokyo, Tokyo, Japan

    Akira Miyazaki

About the author

Dr. Akira Miyazaki
Department of Physics, The University of Tokyo
miyazaki@icepp.s.u-tokyo.ac.jp

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