| Budget Amount *help |
¥25,350,000 (Direct Cost: ¥19,500,000、Indirect Cost: ¥5,850,000)
Fiscal Year 2015: ¥6,630,000 (Direct Cost: ¥5,100,000、Indirect Cost: ¥1,530,000)
Fiscal Year 2014: ¥6,630,000 (Direct Cost: ¥5,100,000、Indirect Cost: ¥1,530,000)
Fiscal Year 2013: ¥12,090,000 (Direct Cost: ¥9,300,000、Indirect Cost: ¥2,790,000)
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| Outline of Final Research Achievements |
Radon is one of the major background sources for dark matter search using xenon. To selectively remove radon atoms by resonance ionization, a ns-pulsed vacuum ultraviolet laser with high-power, narrow linewidth and high wavelength stability was developed using the four-wave mixing technique. Besides, the resonance ionization technique was applied to the analysis of krypton impurity. Krypton concentration in the xenon gas sample taken from the XMASS detector was obtained to be about 100 ppt with a measurement error of 7%.
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