| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2020: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2018: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Outline of Final Research Achievements |
In recent years, it has been determined that neutrinos have mass, and it is theoretically predicted that neutrinos with large mass will decay into neutrinos with small mass by emitting ultra-low-energy photons (neutrino-decay photons) in the far infrared region. And the development of detectors to search for such photons is being promoted. In this study, we have developed an ultra-low energy photon pulse irradiation system for calibrating such detectors using a far-infrared molecular laser owned by the University of Fukui. Furthermore, using this irradiation system, we have developed waveguides for transmitting photon pulses to the detector, diffraction gratings for neutrino decay photon spectroscopy, window materials for a vacuum vessel that accommodates the detector, and so on.
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