Overview
- 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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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.
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Table of contents (5 chapters)
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Front Matter
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Back Matter
Authors and affiliations
About the author
Dr. Akira Miyazaki
Department of Physics, The University of Tokyo
miyazaki@icepp.s.u-tokyo.ac.jp
Department of Physics, The University of Tokyo
miyazaki@icepp.s.u-tokyo.ac.jp
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Bibliographic information
Book title: Direct Measurement of the Hyperfine Structure Interval of Positronium Using High-Power Millimeter Wave Technology
Authors: Akira Miyazaki
Series title: Springer Theses
DOI: https://doi.org/10.1007/978-4-431-55606-0
Publisher: Springer Tokyo
eBook packages: Physics and Astronomy, Physics and Astronomy (R0)
Copyright information: Springer Japan 2015
Hardcover ISBN: 978-4-431-55605-3Published: 11 June 2015
eBook ISBN: 978-4-431-55606-0Published: 01 June 2015
Series ISSN: 2190-5053
Series E-ISSN: 2190-5061
Edition number: 1
Number of pages: XIII, 122
Number of illustrations: 26 b/w illustrations, 53 illustrations in colour
Topics: Nuclear Physics, Heavy Ions, Hadrons, Atomic/Molecular Structure and Spectra, Measurement Science and Instrumentation