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

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

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.

Original languageEnglish
Pages (from-to)141-147
Number of pages7
JournalHyperfine Interactions
Volume212
Issue number1-3
DOIs
Publication statusPublished - 2012 Dec

Keywords

  • Hyperfine splitting
  • Positronium

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Nuclear and High Energy Physics
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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