The sub-THz direct spectroscopy of positronium hyperfine splitting

A. Miyazaki, T. Yamazaki, T. Suehara, T. Namba, S. Asai, T. Kobayashi, H. Saito, Y. Tatematsu, I. Ogawa, T. Idehara

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)


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.

Original languageEnglish
Article number012002
JournalJournal of Physics: Conference Series
Issue number1
Publication statusPublished - 2013
Event16th International Conference on Positron Annihilation, ICPA 2012 - Bristol, United Kingdom
Duration: Aug 19 2012Aug 24 2012

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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