The positronium hyperfine splitting is a good target to study Quantum Electrodynamics in the bound state. There is a discrepancy between precision measurements and a theoretical calculation. We are planning to directly measure the positroinum hyperfine structure for the first time. A gyrotron oscillator is used as a novel radiation source in terahertz region. A Fabry-Pérot resonator is also developed to increase photon density. We have already observed the direct transition at 202.9 GHz. The direct measurement of the order of 100 ppm will be performed within about a year.
|ジャーナル||Journal of Physics: Conference Series|
|出版ステータス||Published - 2013|
|イベント||16th International Conference on Positron Annihilation, ICPA 2012 - Bristol, United Kingdom|
継続期間: 2012 8 19 → 2012 8 24
ASJC Scopus subject areas
- Physics and Astronomy(all)