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Direct Measurement of the Hyperfine Structure Interval of Positronium Using High-Power Millimeter Wave Technology (Hardcover, 2015 ed.)
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Direct Measurement of the Hyperfine Structure Interval of Positronium Using High-Power Millimeter Wave Technology (Hardcover, 2015 ed.)
Series: Springer Theses
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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.
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