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Volume 332 - XIV International Conference on Heavy Quarks and Leptons (HQL2018) - Neutrino Physics
KamLAND-Zen experiment
J. Shirai* on behalf of the KamLAND-Zen Collaboration
*corresponding author
Full text: pdf
Pre-published on: 2018 December 05
Published on: 2018 December 11
Study of Majorana nature of neutrinos is very important in fundamental physics, because it would clarify the extremely smallness of the neutrino mass and open the physics of very high-energy scale which might provide a key to solve the matter dominance of the current Universe. Neutrinoless double beta decay ($0¥nu¥beta¥beta$) of nucleus is a unique process to test the Majorana nature of neutrinos. KamLAND-Zen (KamLAND Zero-Neutrino Double-Beta Decay) is an experiment searching for $0¥nu¥beta¥beta$ of $^{136}$Xe nucleus using KamLAND detector in Kamioka mine in Japan. The experiment has provided the most stringent limit on the $^{136}$Xe $0¥nu¥beta¥beta$ lifetime of $1.07¥times10^{26}$ yr (90¥% C.L.) corresponding to the upper limit (90¥% C.L.) of the effective Majorana neutrino mass $¥langle m_{¥beta¥beta} ¥rangle$$<(61-165)$meV. In this talk current status and future plan of the KamLAND-Zen experiment are reported.
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