| Budget Amount *help |
¥26,650,000 (Direct Cost: ¥20,500,000、Indirect Cost: ¥6,150,000)
Fiscal Year 2011: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2010: ¥11,440,000 (Direct Cost: ¥8,800,000、Indirect Cost: ¥2,640,000)
Fiscal Year 2009: ¥10,010,000 (Direct Cost: ¥7,700,000、Indirect Cost: ¥2,310,000)
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| Research Abstract |
We performed research and developments to realize double beta decay search in KamLAND with world highest sensitivity. First half of this research, we developed mini-balloon which is used in KamLAND, method of installation of mini-balloon, method of filling of xenon loaded liquid scintillator. After the establishment of techniques, we made mini-balloon, installed mini-balloon, and filled xenon loaded liquid scintillator. Then, we started KamLAND-Zen experiment.
KamLAND-Zen collaboration reported first results with 78 days of observation data. The two-neutrino double beta decay half-life of <136>^Xe is 2. 38±0. 02(stat.)±0. 14(syst.)× 10^21 year. The lower limit of neutrino-less double beta decay half-life of <136>^Xe is > 5. 7× 10^24 year.
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