Direct measurement of the hyperfine structure interval of positronium using high-power millimeter wave technology
著者
書誌事項
Direct measurement of the hyperfine structure interval of positronium using high-power millimeter wave technology
（Springer theses : recognizing outstanding Ph. D. research）
Springer, c2015
大学図書館所蔵 全1件
注記
"Doctoral thesis accepted by the University of Tokyo, Tokyo, Japan"
Includes bibliographical references
内容説明・目次
内容説明
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.
目次
Introduction.- Experiment.- Analysis.- Discussion.- Conclusion
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