Direct Measurement of the Hyperfine Structure Interval of Positronium Using High-Power Millimeter Wave Technology
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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.
Dr. Akira Miyazaki Department of Physics, The University of Tokyo miyazaki@icepp.s.u-tokyo.ac.jp
Introduction.- Experiment.- Analysis.- Discussion.- Conclusion.
| Reihe/Serie | Springer Theses |
|---|---|
| Zusatzinfo | 53 Illustrations, color; 26 Illustrations, black and white; XIII, 122 p. 79 illus., 53 illus. in color. |
| Verlagsort | Tokyo |
| Sprache | englisch |
| Maße | 155 x 235 mm |
| Themenwelt | Naturwissenschaften ► Physik / Astronomie ► Atom- / Kern- / Molekularphysik |
| Naturwissenschaften ► Physik / Astronomie ► Mechanik | |
| Schlagworte | Bound-state Quantum Electrodynamics • Cavity Gas Neopentane • Fabry-Pérot Cavity • Ground States of Ps • Gyrotron • Hyperfine Structure of Positronium • The Breit-Wigner Resonant Transition • THz Gap |
| ISBN-10 | 4-431-55605-2 / 4431556052 |
| ISBN-13 | 978-4-431-55605-3 / 9784431556053 |
| Zustand | Neuware |
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Buch | Softcover (2024)
Wiley-VCH (Verlag)
CHF 83,85
