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

doi:10.1007/s10751-011-0399-0

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 journal › Article › peer-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 language	English
Pages (from-to)	141-147
Number of pages	7
Journal	Hyperfine Interactions
Volume	212
Issue number	1-3
DOIs	https://doi.org/10.1007/s10751-011-0399-0
Publication status	Published - 2012 Dec
Externally published	Yes

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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10.1007/s10751-011-0399-0

Cite this

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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-P{\'e}rot resonant cavity and observed the positronium hyperfine transition for the first time.",

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T1 - First observation of o-Ps to p-Ps transition and first direct measurement of positronium hyperfine splitting with sub-THz light

AU - Yamazaki, Takayuki

AU - Miyazaki, Akira

AU - Suehara, Taikan

AU - Namba, Toshio

AU - Asai, Shoji

AU - Kobayashi, Tomio

AU - Saito, Haruo

AU - Urushizaki, Yuichi

AU - Ogawa, Isamu

AU - Idehara, Toshitaka

AU - Sabchevski, Svilen

PY - 2012/12

Y1 - 2012/12

N2 - 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.

AB - 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.

KW - Hyperfine splitting

KW - Positronium

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

Abstract

Keywords

ASJC Scopus subject areas

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