04008nam 22007455 450 991030040200332120200706103354.04-431-55606-010.1007/978-4-431-55606-0(CKB)3710000000422166(EBL)2120628(OCoLC)910622962(SSID)ssj0001525193(PQKBManifestationID)11820638(PQKBTitleCode)TC0001525193(PQKBWorkID)11486622(PQKB)10913445(DE-He213)978-4-431-55606-0(MiAaPQ)EBC2120628(PPN)18640137X(EXLCZ)99371000000042216620150601d2015 u| 0engur|n|---|||||txtccrDirect Measurement of the Hyperfine Structure Interval of Positronium Using High-Power Millimeter Wave Technology /by Akira Miyazaki1st ed. 2015.Tokyo :Springer Japan :Imprint: Springer,2015.1 online resource (130 p.)Springer Theses, Recognizing Outstanding Ph.D. Research,2190-5053Description based upon print version of record.4-431-55605-2 Includes bibliographical references.Introduction -- Experiment -- Analysis -- Discussion -- Conclusion.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.Springer Theses, Recognizing Outstanding Ph.D. Research,2190-5053Nuclear physicsHeavy ionsAtomic structure  Molecular structure Physical measurementsMeasurement   Nuclear Physics, Heavy Ions, Hadronshttps://scigraph.springernature.com/ontologies/product-market-codes/P23010Atomic/Molecular Structure and Spectrahttps://scigraph.springernature.com/ontologies/product-market-codes/P24017Measurement Science and Instrumentationhttps://scigraph.springernature.com/ontologies/product-market-codes/P31040Nuclear physics.Heavy ions.Atomic structure  .Molecular structure .Physical measurements.Measurement   .Nuclear Physics, Heavy Ions, Hadrons.Atomic/Molecular Structure and Spectra.Measurement Science and Instrumentation.539.7212Miyazaki Akiraauthttp://id.loc.gov/vocabulary/relators/aut654105MiAaPQMiAaPQMiAaPQBOOK9910300402003321Direct Measurement of the Hyperfine Structure Interval of Positronium Using High-Power Millimeter Wave Technology1773047UNINA