Measurement of the double-βdecay half-life of ^{136}Xe with the KamLAND-Zen experiment

Details Measurement of the double-βdecay half-life of ^{136}Xe with the KamLAND-Zen experiment Measurement of the double-βdecay half-life of ^{136}Xe with the KamLAND-Zen experiment

2012-01-23

arxiv.org/abs/1201.4664v2

Phys.Rev.C85:045504,2012

Physics

High Energy Physics

High Energy Physics - Experiment

6 pages, 4 figures. Version as published in PRC

Scientific paper

10.1103/PhysRevC.85.045504

We present results from the KamLAND-Zen double-beta decay experiment based on an exposure of 77.6 days with 129 kg of $^{136}$Xe. The measured two-neutrino double-beta decay half-life of $^{136}$Xe is $T_{1/2}^{2\nu} = 2.38 \pm 0.02(stat) \pm 0.14(syst) \times 10^{21}$ yr, consistent with a recent measurement by EXO-200. We also obtain a lower limit for the neutrinoless double-beta decay half-life, $T_{1/2}^{0\nu} > 5.7 \times 10^{24}$ yr at 90% confidence level (C.L.), which corresponds to almost a five-fold improvement over previous limits.

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