| Budget Amount *help |
¥31,720,000 (Direct Cost: ¥24,400,000、Indirect Cost: ¥7,320,000)
Fiscal Year 2020: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2019: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2018: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2017: ¥23,270,000 (Direct Cost: ¥17,900,000、Indirect Cost: ¥5,370,000)
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| Outline of Final Research Achievements |
The purpose of KamLAND-Zen experiment is to search for undiscovered neutrinoless double beta decay (0νββ decay) using 136Xe nuclei, which is the unique test of Majorana nature of neutrinos : neutrinos and antineutrinos are identical particles. In this study construction of a new mini-balloon for the KamLAND-Zen which holds liquid scintillator dissolved with 750 kg xenon gas enriched with 136Xe nuclei was made, and the 0νββ decay search by taking high-quality data was started for the experiment. The new balloon was confirmed to be clean enough and the data taking has been stably continued. In addition, new analysis methods have been introduced to remove background events and various efforts have been made to improve the detector performance, which significantly made better the sensitivity.
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