| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2015: ¥130,000 (Direct Cost: ¥100,000、Indirect Cost: ¥30,000)
Fiscal Year 2014: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2013: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
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| Outline of Final Research Achievements |
In "KamLAND-Zen" experiment, searching for neutrinoless double beta decay (0νββ) using Xe-136, we performed precise energy calibration with monitoring the position of the radioactive sources. The relation between light yield and energy depends on the position of the vertexes, so the uncertainty of the position of the radioactive sources contributes to the uncertainty of the energy scale. By monitoring the source position precisely then, systematic uncertainty of the energy scale has been reduced. We developed monitoring camera which can work in the oil-based liquid scintillator, to accomplish this precise position monitoring. With using the results of this precise energy calibration, we achieved the improvement in the sensitivity of search for 0νββ.
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