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Autore: | Miyazaki Akira |
Titolo: | Direct Measurement of the Hyperfine Structure Interval of Positronium Using High-Power Millimeter Wave Technology / / by Akira Miyazaki |
Pubblicazione: | Tokyo : , : Springer Japan : , : Imprint : Springer, , 2015 |
Edizione: | 1st ed. 2015. |
Descrizione fisica: | 1 online resource (130 p.) |
Disciplina: | 539.7212 |
Soggetto topico: | Nuclear physics |
Heavy ions | |
Atomic structure | |
Molecular structure | |
Physical measurements | |
Measurement | |
Nuclear Physics, Heavy Ions, Hadrons | |
Atomic/Molecular Structure and Spectra | |
Measurement Science and Instrumentation | |
Note generali: | Description based upon print version of record. |
Nota di bibliografia: | Includes bibliographical references. |
Nota di contenuto: | Introduction -- Experiment -- Analysis -- Discussion -- Conclusion. |
Sommario/riassunto: | 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. |
Titolo autorizzato: | Direct Measurement of the Hyperfine Structure Interval of Positronium Using High-Power Millimeter Wave Technology |
ISBN: | 4-431-55606-0 |
Formato: | Materiale a stampa |
Livello bibliografico | Monografia |
Lingua di pubblicazione: | Inglese |
Record Nr.: | 9910300402003321 |
Lo trovi qui: | Univ. Federico II |
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