Direct measurement of the hyperfine structure of the ground state positronium using high power sub-THz radiation

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

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

Abstract

We plan to directly measure the hyperfine structure of the ground-state positronium. The hyperfine structure between ortho-positronium and para-positronium is about 203 GHz. We develop a new optical system to accumulate about 10 kW power using a gyrotron and a Fabry-Pérot cavity, and have already observed the hyperfine transition at a frequency point of 202.9 GHz. The transition probability is measured to be A = 3.1-1.2 +1.6×10-8 s-1, which is in good agreement with the theoretical value of 3.37×10-8 s-1. In order to measure the hyperfine structure, we have to repeat transition measurements at different frequencies around 203 GHz. We are now refining the optical system to quickly change output frequency and obtain more power.

Original languageEnglish
Title of host publicationIRMMW-THz 2012 - 37th International Conference on Infrared, Millimeter, and Terahertz Waves
DOIs
Publication statusPublished - Dec 1 2012
Externally publishedYes
Event37th International Conference on Infrared, Millimeter and Terahertz Waves, IRMMW-THz 2012 - Wollongong, NSW, Australia
Duration: Sep 23 2012Sep 28 2012

Publication series

NameInternational Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz
ISSN (Print)2162-2027
ISSN (Electronic)2162-2035

Other

Other37th International Conference on Infrared, Millimeter and Terahertz Waves, IRMMW-THz 2012
CountryAustralia
CityWollongong, NSW
Period9/23/129/28/12

All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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  • Cite this

    Yamazaki, T., Miyazaki, A., Suehara, T., Namba, T., Asai, S., Kobayashi, T., Saito, H., Tatematsu, Y., Ogawa, I., & Idehara, T. (2012). Direct measurement of the hyperfine structure of the ground state positronium using high power sub-THz radiation. In IRMMW-THz 2012 - 37th International Conference on Infrared, Millimeter, and Terahertz Waves [6380416] (International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz). https://doi.org/10.1109/IRMMW-THz.2012.6380416