746 citations · 1.8k across the 18 of their papers we have counts for
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Probing Physics in Vacuum Using an X-ray Free-Electron Laser, a High-Power Laser, and a High-Field Magnet
T. Inada, T. Yamazaki, T. Yamaji +5
A nonlinear interaction between photons is observed in a process that involves charge sources. To observe this process in a vacuum, there are a growing number of theoretical and ex…
Search for Photon-Photon Elastic Scattering in the X-ray Region
T. Inada, T. Yamaji, S. Adachi +9
We report the first results of a search for real photon-photon scattering using X rays. A novel system is developed to split and collide X-ray pulses by applying interferometric te…
New Precision Measurement of Hyperfine Splitting of Positronium
A. Ishida, T. Namba, S. Asai +5
The ground state hyperfine splitting of positronium is sensitive to high order corrections of quantum electrodynamics (QED) in bound state. The theoretical predi…
Detection of the Direct Hyperfine Transition of Positronium Atoms using sub-THz High-power Radiation
T. Suehara, A. Miyazaki, T. Yamazaki +11
Hyperfine splitting of positronium is an important parameter for particle physics. This paper gives experimental techniques and results of R&D studies of our experiment to observe…
Probing the Energy Structure of Positronium with a 203 GHz Fabry-Perot Cavity
T Suehara, A Miyazaki, A Ishida +10
Positronium is an ideal system for the research of the bound state QED. The hyperfine splitting of positronium (Ps-HFS: about 203 GHz) is sensitive to new physics beyond the Standa…
Precise measurement of HFS of positronium
A. Ishida, G. Akimoto, K. Kato +11
The ground state hyperfine splitting in positronium, , is sensitive to high order corrections of QED. A new calculation up to has revealed a disc…