| Budget Amount *help |
¥27,690,000 (Direct Cost: ¥21,300,000、Indirect Cost: ¥6,390,000)
Fiscal Year 2014: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2013: ¥7,670,000 (Direct Cost: ¥5,900,000、Indirect Cost: ¥1,770,000)
Fiscal Year 2012: ¥12,090,000 (Direct Cost: ¥9,300,000、Indirect Cost: ¥2,790,000)
Fiscal Year 2011: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
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| Outline of Final Research Achievements |
The development of devices highly sensitive to neutrino-less double-beta decays using isotopically enriched xenon was performed. The specially-shaped light-concentrating mirrors for the large volume liquid scintillator detector (KamLAND) were produced from aluminum metalizing PET film, and the increase of light collection efficiencies for scintillation light coming from distant points was confirmed. In addition, the purification by distillation and adsorption to enhance the optical performance of linear-alkylbenzene-based liquid scintillator was performed, resulting in better performance than the original liquid scintillator in use. The present study allows us to suggest a specific plan to test the inverted hierarchy neutrino masses by the neutrino-less double-beta decay experiment.
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