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.
|Journal||Journal of Physics: Conference Series|
|Publication status||Published - 2013|
|Event||16th International Conference on Positron Annihilation, ICPA 2012 - Bristol, United Kingdom|
Duration: 2012 Aug 19 → 2012 Aug 24
ASJC Scopus subject areas
- Physics and Astronomy(all)