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

  • Akira Miyazaki

Part of the Springer Theses book series (Springer Theses)

Table of contents

  1. Front Matter
    Pages i-xiii
  2. Akira Miyazaki
    Pages 1-16
  3. Akira Miyazaki
    Pages 17-61
  4. Akira Miyazaki
    Pages 63-85
  5. Akira Miyazaki
    Pages 87-93
  6. Akira Miyazaki
    Pages 95-96
  7. Back Matter
    Pages 97-122

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.


Bound-state Quantum Electrodynamics Cavity Gas Neopentane Fabry-Pérot Cavity Ground States of Ps Gyrotron Hyperfine Structure of Positronium THz Gap The Breit-Wigner Resonant Transition

Authors and affiliations

  • Akira Miyazaki
    • 1
  1. 1.Department of Physics, Graduate School of ScienceThe University of TokyoTokyoJapan

Bibliographic information

  • DOI
  • Copyright Information Springer Japan 2015
  • Publisher Name Springer, Tokyo
  • eBook Packages Physics and Astronomy
  • Print ISBN 978-4-431-55605-3
  • Online ISBN 978-4-431-55606-0
  • Series Print ISSN 2190-5053
  • Series Online ISSN 2190-5061
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