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Hyperfine Interactions

, Volume 212, Issue 1–3, pp 141–147 | Cite as

First observation of o-Ps to p-Ps transition and first direct measurement of positronium hyperfine splitting with sub-THz light

  • Takayuki Yamazaki
  • Akira Miyazaki
  • Taikan Suehara
  • Toshio Namba
  • Shoji Asai
  • Tomio Kobayashi
  • Haruo Saito
  • Yuichi Urushizaki
  • Isamu Ogawa
  • Toshitaka Idehara
  • Svilen Sabchevski
Article

Abstract

Positronium is an ideal system for the research of the bound state QED. The hyperfine splitting of positronium (Ps-HFS, about 203 GHz) is an important observable but all previous measurements of Ps-HFS had been measured indirectly using Zeeman splitting. There might be the unknown systematic errors on the uniformity of magnetic field. We are trying to measure Ps-HFS directly using sub-THz radiation. We developed an optical system to accumulate high power (about 10 kW) radiation in a Fabry-Pérot resonant cavity and observed the positronium hyperfine transition for the first time.

Keywords

Positronium Hyperfine splitting 

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Takayuki Yamazaki
    • 1
  • Akira Miyazaki
    • 1
  • Taikan Suehara
    • 1
  • Toshio Namba
    • 1
  • Shoji Asai
    • 1
  • Tomio Kobayashi
    • 1
  • Haruo Saito
    • 2
  • Yuichi Urushizaki
    • 3
  • Isamu Ogawa
    • 3
  • Toshitaka Idehara
    • 3
  • Svilen Sabchevski
    • 4
  1. 1.Department of Physics, Graduate School of Science, and International Center for Elementary Particle PhysicsUniversity of TokyoTokyoJapan
  2. 2.Graduate School of Arts and SciencesUniversity of TokyoTokyoJapan
  3. 3.Research Center for Development of Far-Infrared RegionUniversity of FukuiFukuiJapan
  4. 4.Bulgarian Academy of SciencesSofiaBulgaria

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