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

Akira Miyazaki (Autor)

eBook Download: PDF

2015 | 2015
XIII, 122 Seiten
Springer Tokyo (Verlag)
978-4-431-55606-0 (ISBN)

Infos

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
[e-mail]

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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-Perot 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.

Inhalt

Introduction.- Experiment.- Analysis.- Discussion.- Conclusion

Produkt-Details

• Erscheint lt. Verlag: 1.6.2015
• Reihe/Serie: Springer Theses
• Reihe/Serie: Springer Theses
• Zusatzinfo: XIII, 122 p. 79 illus., 53 illus. in color.
• Verlagsort: Tokyo
• Sprache: englisch
• Themenwelt: Naturwissenschaften ► Physik / Astronomie ► Atom- / Kern- / Molekularphysik
• Themenwelt: Naturwissenschaften ► Physik / Astronomie ► Mechanik
• Themenwelt: Technik
• 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: 4-431-55606-0 / 4431556060
• ISBN-13: 978-4-431-55606-0 / 9784431556060