Title Direct Measurement of the Hyperfine Structure Interval of Positronium Using High-Power Millimeter Wave Technology Author(s) Miyazaki, Akira Publication Tokyo, Springer Japan, 2015. Description XIII, 122 p. 79 illus., 53 illus. in color : online resource Abstract Note 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-P??rot 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 ISBN,Price 9784431556060 Keyword(s) 1. Atomic structure???? 2. Atomic/Molecular Structure and Spectra 3. EBOOK 4. EBOOK - SPRINGER 5. Heavy ions 6. Measurement Science and Instrumentation 7. Measurement?????? 8. Molecular structure?? 9. NUCLEAR PHYSICS 10. Nuclear Physics, Heavy Ions, Hadrons 11. PHYSICAL MEASUREMENTS Item Type eBook Multi-Media Links Please Click here for eBook Circulation Data Accession#   Call# Status Issued To Return Due On Physical Location I06009     On Shelf