{"product_id":"direct-measurement-of-the-hyperfine-structure-interval-of-positronium-using-high-power-millimeter-wave-technology-von-akira-miyazaki","title":"Direct Measurement of the Hyperfine Structure Interval of Positronium Using High-Power Millimeter Wave Technology","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-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.\u003cdiv class=\"aw-variant-hidden-subtitle-div\" id=\"aw-variant-subtitle-9784431556053\"\u003e\u003ch3\u003e\u003c\/h3\u003e\u003c\/div\u003e","brand":"Autorenwelt Shop","offers":[{"title":"Hardcover - 9784431556053","offer_id":40558208483421,"sku":"9784431556053","price":106.99,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/0622\/files\/9d6eda12-1abb-4519-8acb-30f137f22a2c.jpg?v=1775190779","url":"https:\/\/shop.autorenwelt.de\/products\/direct-measurement-of-the-hyperfine-structure-interval-of-positronium-using-high-power-millimeter-wave-technology-von-akira-miyazaki","provider":"Autorenwelt Shop","version":"1.0","type":"link"}