2015 Fiscal Year Final Research Report
Research and development of external control of paired-superradiance from hydrogen gas toward the neutrino mass measurement
| Project/Area Number |
26887026
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| Research Category |
Grant-in-Aid for Research Activity 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 | Okayama University |
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Principal Investigator |
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| Project Period (FY) |
2014-08-29 – 2016-03-31
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| Keywords | 二光子放出 / ニュートリノ / パラ水素 |
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| Outline of Final Research Achievements |
The externally-triggered coherent two-photon emission has been observed. This phenomenon is one of essential parts of future neutrino mass measurement using atoms. In the experiment, three-color laser pulses (532, 684, 4587 nm) were simultaneously irradiated into 60-kPa para-hydrogen gas cooled down to 78K, and the pulses of 5048 nm which is two-photon emission signal were detected by photo-detectors. The resulting amplification factor against the spontaneous emission rate has been more than 10E18. Laser power dependence and trigger timing dependence were also studied, and they were able to be explained by a numerical simulation qualitatively.
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| Free Research Field |
素粒子・原子核・宇宙線・宇宙物理
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