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

研究成果: Conference contribution

抄録

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.

本文言語English
ホスト出版物のタイトルIRMMW-THz 2012 - 37th International Conference on Infrared, Millimeter, and Terahertz Waves
DOI
出版ステータスPublished - 2012
イベント37th International Conference on Infrared, Millimeter and Terahertz Waves, IRMMW-THz 2012 - Wollongong, NSW, Australia
継続期間: 2012 9 232012 9 28

出版物シリーズ

名前International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz
ISSN(印刷版)2162-2027
ISSN(電子版)2162-2035

Other

Other37th International Conference on Infrared, Millimeter and Terahertz Waves, IRMMW-THz 2012
国/地域Australia
CityWollongong, NSW
Period12/9/2312/9/28

ASJC Scopus subject areas

  • エネルギー工学および電力技術
  • 電子工学および電気工学

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