Direct measurement of positronium hyperfine structure: ̃ A new horizon of precision spectroscopy using gyrotrons

Shoji Asai, Takayuki Yamazaki, Akira Miyazaki, Taikan Suehara, Toshio Namba, Tomio Kobayashi, Haruhiko Saito, Takatoshi Idehara, Isamu Ogawa, S. Sabchevski

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Positronium is an ideal system for research on QED, especially in a bound state. A discrepancy (3.9s) is found recently between measured HFS values and the QED prediction (including up-to O(α 3 log α -1), where a is the fine-structure constant.). It might be due to a contribution of unknown new physics or common systematic problems in all the previous measurements. A new method to measure HFS directly is performed using a high power gyrotron. The transition from ortho-positronium to para-positronium has been observed with 5 σ CL, which is the first observation of M1 transition in (sub)Terahertz region. New technologies of high power gyrotrons are developed for precision spectroscopy.

Original languageEnglish
Pages (from-to)766-776
Number of pages11
JournalJournal of Infrared, Millimeter, and Terahertz Waves
Volume33
Issue number7
DOIs
Publication statusPublished - Jul 2012

All Science Journal Classification (ASJC) codes

  • Radiation
  • Instrumentation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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