2010 Fiscal Year Final Research Report
Direct measurement of Ps Hyper Fine Structure using sub THz
| Project/Area Number |
20340049
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | The University of Tokyo |
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Principal Investigator |
ASAI Shoji The University of Tokyo, 大学院・理学系研究科, 准教授 (60282505)
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| Co-Investigator(Renkei-kenkyūsha) |
KOBAYASHI Tomio 東京大学, 素粒子物理国際研究センター, 教授 (50126059)
NAMBA Toshio 東京大学, 素粒子物理国際研究センター, 助教 (40376702)
SAITO Haruo 東京大学, 総合文化研究科, 准教授 (60235059)
IDEHARA Toshitaka 福井大学, 遠赤外領域開発研究センター, 特任教授 (80020197)
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| Project Period (FY) |
2008 – 2010
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| Keywords | ポジトロニウム / 量子電磁気学 / テラヘルツ波 / 超微細構造 / ジャイロトロン |
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| Research 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 measurement Ps-HFS employed static magnetic field and measured Ps-HFS indirectly using Zeeman splitting. We propose new method 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-Perot resonant cavity and observed the positronium hyperfine transition for the first time.
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[Journal Article] Precision measurements of positronium decay rate and energy level2008
Author(s)
S.Asai, Y.Kataoka, T.Kobayashi, T.Namba, T.Suehara, G.Akimoto, A.Ishida, M.M.Hashimoto, H.Saito, T.Idehara, M.Yoshida
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Journal Title
AIP Conference Proceedings 1037
Pages: 43-55
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