The first direct observation of positronium hyperfine splitting

Taikan Suehara, Takayuki Yamazaki, Akira Miyazaki, Ginga Akimoto, Akira Ishida, Toshio Namba, Shoji Asai, Tomio Kobayashi, Haruo Saito, Toshitaka Idehara, Isamu Ogawa, Svilen Sabchevski

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The direct transition from ortho-positronium to para-positronium with high-power sub-THz radiation has been observed with 5.1 σ significance. The observed transition rate is consistent with the theoretical calculation. A sub-THz gyrotron is used as the light source, and a quasi-optical Fabry-Perot cavity is utilized to accumulate the radiation. This is the first observation of the positronium hyperfine splitting (Ps-HFS), which leads to the first direct measurement of Ps-HFS with a target accuracy of 100 ppm in several years.

Original languageEnglish
Title of host publication19th Particles and Nuclei International Conference, PANIC11
Pages549-551
Number of pages3
DOIs
Publication statusPublished - 2012
Externally publishedYes
Event19th Particles and Nuclei International Conference, PANIC11 - Cambridge, MA, United States
Duration: Jul 24 2011Jul 29 2011

Publication series

NameAIP Conference Proceedings
Volume1441
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other19th Particles and Nuclei International Conference, PANIC11
Country/TerritoryUnited States
CityCambridge, MA
Period7/24/117/29/11

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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