2011 Fiscal Year Final Research Report
Basic research for search for neutrino-less double beta decay of 136Xe in KamLAND
| Project/Area Number |
21684008
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| Research Category |
Grant-in-Aid for Young Scientists (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | Tohoku University |
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Principal Investigator |
GANDO Yoshihito 東北大学, ニュートリノ科学研究センター, 助教 (60396421)
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| Project Period (FY) |
2009 – 2011
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| Keywords | 素粒子(実験) |
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| Research Abstract |
We performed research and developments to realize double beta decay search in KamLAND with world highest sensitivity. First half of this research, we developed mini-balloon which is used in KamLAND, method of installation of mini-balloon, method of filling of xenon loaded liquid scintillator. After the establishment of techniques, we made mini-balloon, installed mini-balloon, and filled xenon loaded liquid scintillator. Then, we started KamLAND-Zen experiment.
KamLAND-Zen collaboration reported first results with 78 days of observation data. The two-neutrino double beta decay half-life of <136>^Xe is 2. 38±0. 02(stat.)±0. 14(syst.)× 10^21 year. The lower limit of neutrino-less double beta decay half-life of <136>^Xe is > 5. 7× 10^24 year.
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