| Budget Amount *help |
¥236,990,000 (Direct Cost: ¥182,300,000、Indirect Cost: ¥54,690,000)
Fiscal Year 2023: ¥47,190,000 (Direct Cost: ¥36,300,000、Indirect Cost: ¥10,890,000)
Fiscal Year 2022: ¥55,380,000 (Direct Cost: ¥42,600,000、Indirect Cost: ¥12,780,000)
Fiscal Year 2021: ¥57,980,000 (Direct Cost: ¥44,600,000、Indirect Cost: ¥13,380,000)
Fiscal Year 2020: ¥46,540,000 (Direct Cost: ¥35,800,000、Indirect Cost: ¥10,740,000)
Fiscal Year 2019: ¥29,900,000 (Direct Cost: ¥23,000,000、Indirect Cost: ¥6,900,000)
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| Outline of Final Research Achievements |
We conducted a search for neutrinoless double beta decay in 136Xe with the world's highest sensitivity. The energy resolution was improved through detailed calibration and improved analysis methods, and the problem of the generation of long-lived radioactive nuclei due to cosmic rays was reduced by focusing on the number of associating neutrons. As a result, the excluded region on effective Majorana neutrino mass reached the inverted ordering region for the first time in the world, and started to cover theoretical predictions. Furthermore, in the geoneutrino observations that were being carried out in parallel as a multipurpose project, we succeeded in eliminating the High-Q model, which has a large amount of geothermal heat, and succeeded in providing new knowledge about the convection style and composition of the mantle. Neutrino observation has reached a new milestone in solving major problems in earth science.
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