| 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(Kenkyū-buntansha) |
出原 敏孝 福井大学, 遠赤外領域開発研究センター, 特任教授 (80020197)
齋藤 晴雄 東京大学, 大学院・総合文化研究科, 准教授 (60235059)
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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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| Project Status |
Completed (Fiscal Year 2010)
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| Budget Amount *help |
¥19,500,000 (Direct Cost: ¥15,000,000、Indirect Cost: ¥4,500,000)
Fiscal Year 2010: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2009: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2008: ¥13,130,000 (Direct Cost: ¥10,100,000、Indirect Cost: ¥3,030,000)
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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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