746 citations · 1.8k across the 18 of their papers we have counts for
18 papers
Laser cooling of positronium
K. Shu, Y. Tajima, R. Uozumi +16
When laser radiation is skilfully applied, atoms and molecules can be cooled allowing precise measurements and control of quantum systems. This is essential in fundamental studies…
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…
Study on Cooling of Positronium for Bose-Einstein Condensation
Kenji Shu, Xing Fan, Takayuki Yamazaki +4
A new method of cooling positronium down is proposed to realize Bose-Einstein condensation of positronium. We perform detail studies about three processes (1) thermalization proces…
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…
Results of a Search for Paraphotons with Intense X-ray Beams at SPring-8
T. Inada, T. Namba, S. Asai +5
A search for paraphotons, or hidden U(1) gauge bosons, is performed using an intense X-ray beamline at SPring--8. "Light Shining through a Wall" technique is used in this search. N…