The first direct observation of positronium hyperfine splitting

Taikan Suehara; Takayuki Yamazaki; Akira Miyazaki; Ginga Akimoto; Akira Ishida; Toshio Namba; Shoji Asai; Tomio Kobayashi; Haruo Saito; Toshitaka Idehara; Isamu Ogawa; Svilen Sabchevski

doi:10.1063/1.3700613

The first direct observation of positronium hyperfine splitting

Taikan Suehara, Takayuki Yamazaki, Akira Miyazaki, Ginga Akimoto, Akira Ishida, Toshio Namba, Shoji Asai, Tomio Kobayashi, Haruo Saito, Toshitaka Idehara, Isamu Ogawa, Svilen Sabchevski

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

The direct transition from ortho-positronium to para-positronium with high-power sub-THz radiation has been observed with 5.1 σ significance. The observed transition rate is consistent with the theoretical calculation. A sub-THz gyrotron is used as the light source, and a quasi-optical Fabry-Perot cavity is utilized to accumulate the radiation. This is the first observation of the positronium hyperfine splitting (Ps-HFS), which leads to the first direct measurement of Ps-HFS with a target accuracy of 100 ppm in several years.

Original language	English
Title of host publication	19th Particles and Nuclei International Conference, PANIC11
Pages	549-551
Number of pages	3
DOIs	https://doi.org/10.1063/1.3700613
Publication status	Published - 2012
Externally published	Yes
Event	19th Particles and Nuclei International Conference, PANIC11 - Cambridge, MA, United States Duration: 2011 Jul 24 → 2011 Jul 29

Publication series

Name	AIP Conference Proceedings
Volume	1441
ISSN (Print)	0094-243X
ISSN (Electronic)	1551-7616

Other

Other	19th Particles and Nuclei International Conference, PANIC11
Country/Territory	United States
City	Cambridge, MA
Period	11/7/24 → 11/7/29

Keywords

QED, positronium
cavity
gyrotron
hyperfine splitting

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1063/1.3700613

Cite this

Suehara, T., Yamazaki, T., Miyazaki, A., Akimoto, G., Ishida, A., Namba, T., Asai, S., Kobayashi, T., Saito, H., Idehara, T., Ogawa, I., & Sabchevski, S. (2012). The first direct observation of positronium hyperfine splitting. In 19th Particles and Nuclei International Conference, PANIC11 (pp. 549-551). (AIP Conference Proceedings; Vol. 1441). https://doi.org/10.1063/1.3700613

Suehara, T, Yamazaki, T, Miyazaki, A, Akimoto, G, Ishida, A, Namba, T, Asai, S, Kobayashi, T, Saito, H, Idehara, T, Ogawa, I & Sabchevski, S 2012, The first direct observation of positronium hyperfine splitting. in 19th Particles and Nuclei International Conference, PANIC11. AIP Conference Proceedings, vol. 1441, pp. 549-551, 19th Particles and Nuclei International Conference, PANIC11, Cambridge, MA, United States, 11/7/24. https://doi.org/10.1063/1.3700613

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abstract = "The direct transition from ortho-positronium to para-positronium with high-power sub-THz radiation has been observed with 5.1 σ significance. The observed transition rate is consistent with the theoretical calculation. A sub-THz gyrotron is used as the light source, and a quasi-optical Fabry-Perot cavity is utilized to accumulate the radiation. This is the first observation of the positronium hyperfine splitting (Ps-HFS), which leads to the first direct measurement of Ps-HFS with a target accuracy of 100 ppm in several years.",

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AU - Suehara, Taikan

AU - Yamazaki, Takayuki

AU - Miyazaki, Akira

AU - Akimoto, Ginga

AU - Ishida, Akira

AU - Namba, Toshio

AU - Asai, Shoji

AU - Kobayashi, Tomio

AU - Saito, Haruo

AU - Idehara, Toshitaka

AU - Ogawa, Isamu

AU - Sabchevski, Svilen

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AB - The direct transition from ortho-positronium to para-positronium with high-power sub-THz radiation has been observed with 5.1 σ significance. The observed transition rate is consistent with the theoretical calculation. A sub-THz gyrotron is used as the light source, and a quasi-optical Fabry-Perot cavity is utilized to accumulate the radiation. This is the first observation of the positronium hyperfine splitting (Ps-HFS), which leads to the first direct measurement of Ps-HFS with a target accuracy of 100 ppm in several years.

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The first direct observation of positronium hyperfine splitting

Abstract

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Keywords

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