Direct measurement of the hyperfine structure interval of positronium using high-power millimeter wave technology
Author(s)
Bibliographic Information
Direct measurement of the hyperfine structure interval of positronium using high-power millimeter wave technology
（Springer theses : recognizing outstanding Ph. D. research）
Springer, c2015
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"Doctoral thesis accepted by the University of Tokyo, Tokyo, Japan"
Includes bibliographical references
Description and Table of Contents
Description
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.
Table of Contents
Introduction.- Experiment.- Analysis.- Discussion.- Conclusion
by "Nielsen BookData"
