| Budget Amount *help |
¥273,520,000 (Direct Cost: ¥210,400,000、Indirect Cost: ¥63,120,000)
Fiscal Year 2018: ¥68,120,000 (Direct Cost: ¥52,400,000、Indirect Cost: ¥15,720,000)
Fiscal Year 2017: ¥69,030,000 (Direct Cost: ¥53,100,000、Indirect Cost: ¥15,930,000)
Fiscal Year 2016: ¥44,200,000 (Direct Cost: ¥34,000,000、Indirect Cost: ¥10,200,000)
Fiscal Year 2015: ¥39,260,000 (Direct Cost: ¥30,200,000、Indirect Cost: ¥9,060,000)
Fiscal Year 2014: ¥52,910,000 (Direct Cost: ¥40,700,000、Indirect Cost: ¥12,210,000)
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| Outline of Final Research Achievements |
The purpose of this research is to develop the way to meV reagion of effective neutrino mass by neutrinoless double beta decay of 48Ca. We studied (1)48Ca enrichment technique, (2) Scintillating bolometer technique to achieve high resolution with particle ID, (3) Measurement of 48Ca 0nDBD by CANDLES experiment. (1) We aimed to enrich 48Ca from the natural abundance (0.19%) to more than 2%. We dveloped a method MCCCE (Multi-channel counter current electrophoresis) by which we were able to obtain 16% which is surprizingly a high enrichment and 10 times more than our original goal. It has a potential of furtehr improvement. (2) We developed scinitillating bolometer to improve energy resolution with particle ID. We successfully demonstrated that the technique works for CaF2 crystals. (3) We constructed shielding system for CANDLES by which we successfully reduced backgrounds from outside. We gave the world best limit on the lifetime of 48Ca 0nDBD.
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