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

doi:10.1093/ptep/ptu181

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

Experimental Particle Physics

Research output: Contribution to journal › Article › peer-review

33 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 language	English
Article number	011C01
Journal	Progress of Theoretical and Experimental Physics
Volume	2015
Issue number	1
DOIs	https://doi.org/10.1093/ptep/ptu181
Publication status	Published - Oct 10 2014

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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10.1093/ptep/ptu181

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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-P{\'e}rot 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.",

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AU - Miyazaki, A.

AU - Yamazaki, T.

AU - Suehara, T.

AU - Namba, T.

AU - Asai, S.

AU - Kobayashi, T.

AU - Saito, H.

AU - Tatematsu, Y.

AU - Ogawa, I.

AU - Idehara, T.

PY - 2014/10/10

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AB - 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.

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First millimeter-wave spectroscopy of ground-state positronium

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