| Co-Investigator(Kenkyū-buntansha) |
高久 雄一 公益財団法人環境科学技術研究所, 環境影響研究部, 研究部長 (40715497)
井上 睦夫 金沢大学, 環日本海域環境研究センター, 准教授 (60283090)
鈴木 英之 東京理科大学, 理工学部物理学科, 教授 (90211987)
池田 一得 東京大学, 宇宙線研究所, 助教 (90583477)
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| Budget Amount *help |
¥167,050,000 (Direct Cost: ¥128,500,000、Indirect Cost: ¥38,550,000)
Fiscal Year 2018: ¥32,760,000 (Direct Cost: ¥25,200,000、Indirect Cost: ¥7,560,000)
Fiscal Year 2017: ¥32,760,000 (Direct Cost: ¥25,200,000、Indirect Cost: ¥7,560,000)
Fiscal Year 2016: ¥23,790,000 (Direct Cost: ¥18,300,000、Indirect Cost: ¥5,490,000)
Fiscal Year 2015: ¥37,830,000 (Direct Cost: ¥29,100,000、Indirect Cost: ¥8,730,000)
Fiscal Year 2014: ¥39,910,000 (Direct Cost: ¥30,700,000、Indirect Cost: ¥9,210,000)
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| Outline of Final Research Achievements |
The SK-Gd project is a new experiment in which 0.2% gadolinium sulfate octahydrate will be loaded into the water Cherenkov detector of SK. The main goal of SK-Gd is to discover supernova relic neutrinos. When the material of gadolinium sulfate octahydrate is manufactured commercially at a company, it contains radioactive impurities (U, Th, Rn). After developing how to measure those impurities in the material and also in a test at a 200-ton Gd-loaded water Cherenkov detector, we have found that the level of radioactive impurities in the material after reducing those impurities at the production stage is less than our goal (0.3mBq/(Gd sulfate)kg and the water transparency is better than 77% (at 15m of water). The results have fulfiled our initial goal and convinced the SK collaborators to start the SK-Gd project. In addition, the theoretical development of supernova relic neutrinos and the development of gamma-ray decay model of the thermal neutron capture were successfully performed.
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