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

Direct Measurement of the Hyperfine Structure Interval of Positronium Using High-Power Millimeter Wave Technology 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. Autor: Akira Miyazaki Wydawnictwo: Springer Verlag, Japan Rok wydania: 2015 Okładka: twarda Liczba stron: 122 Wymiary: 15.5 x 23.5 x 1 cm Ilustracje: 30 Tables, black and white; 53 Illustrations, color; 26 Illustrations, black and white; XIII, 122 p. 79 illus., 53 illus. in color. Język: angielski ISBN: 9784431556053