What Is Known And Unexpected At Lhc
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Future Of Our Physics Including New Frontiers, The: Proceedings Of The 53rd Course Of The International School Of Subnuclear Physics
Author: Antonino Zichichi
language: en
Publisher: World Scientific
Release Date: 2017-02-13
The main focus of this year's Proceedings of the 53rd Course of the International School of Subnuclear Physics is the future of physics, including the new frontiers in other fields.
Direct Measurement of the Hyperfine Structure Interval of Positronium Using High-Power Millimeter Wave Technology
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.
Understanding the Large Hadron Collider
Author: Fred Bortz
language: en
Publisher: Cavendish Square Publishing, LLC
Release Date: 2015-07-15
Discover the engineering and science behind particle accelerators, the massive machines that smash the smallest atoms together to observe how they work.