First millimeter-wave spectroscopy of ground-state positronium

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

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

We report on the first measurement of the Breit-Wigner resonance of the transition from ortho-positronium to para-positronium. We have developed an optical system to accumulate a power of over 20 kW using a frequency-tunable gyrotron and a Fabry-Pérot cavity. This system opens a new era of millimeter-wave spectroscopy, and enables us to directly determine both the hyperfine interval and the decay width of para-Ps.

Original languageEnglish
Article number011C01
JournalProgress of Theoretical and Experimental Physics
Volume2015
Issue number1
DOIs
Publication statusPublished - 2014 Oct 10

Keywords

  • C40
  • C50

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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  • Cite this

    Miyazaki, A., Yamazaki, T., Suehara, T., Namba, T., Asai, S., Kobayashi, T., Saito, H., Tatematsu, Y., Ogawa, I., & Idehara, T. (2014). First millimeter-wave spectroscopy of ground-state positronium. Progress of Theoretical and Experimental Physics, 2015(1), [011C01]. https://doi.org/10.1093/ptep/ptu181