2009 Fiscal Year Final Research Report
Precise measurement of the hyperfine splitting constant of positronium using sub-THz radiation
| Project/Area Number |
20840010
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| Research Category |
Grant-in-Aid for Young Scientists (Start-up)
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| Allocation Type | Single-year Grants |
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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 |
SUEHARA Taikan The University of Tokyo, 素粒子物理国際研究センター, 特任研究員 (20508387)
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| Project Period (FY) |
2008 – 2009
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| Keywords | 素粒子実験 / 放射線 / X線 / 粒子線 / ファブリー・ペロー共振器 / ジャイロトロン / ミリ波 / ポジトロニウム / 超微細構造 |
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| Research Abstract |
Hyperfine splitting of positronium, which is the energy difference between ortho-positronium (o-Ps) and para-positronium (p-Ps), has 3.9σdeviation between theoretical expectations and experimental results. Observing direct stimulated transition from o-Ps to p-Ps under sub-THz radiation is effective to investigate the discrepancy. A sub-THz high power light source gyrotron, a high-Finesse Fabry-Perot cavity, a quasi-optical Gaussian converter and a detector simulation has been developed and optimized, which has enabled the transition observation.
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