PoS - Proceedings of Science
Volume 421 - Neutrino Oscillation Workshop (NOW2022) - Session IV. Neutrino masses, states and interactions
Recent results from KamLAND-Zen
K. Ichimura*  on behalf of the KamLAND-Zen Collaboration
Full text: pdf
Pre-published on: December 28, 2022
Published on: March 28, 2023
A search for the neutrinoless double beta decay of $^{136}$Xe was conducted with the xenon-loaded liquid scintillator detector KamLAND-Zen 800 using 970 kg$\cdot$year of $^{136}$Xe exposure. No significant signal excess from the expected background was observed from the energy spectrum fitting, and we set a lower limit on the half-life of
2.0 $\times$ 10$^{26}$ years at a 90% confidence level.
A combined fit of the KamLAND-Zen 400 and 800 data sets gives a lower limit of the half-life of 2.3 $\times$ 10$^{26}$ years at a 90% confidence level. It corresponds to the upper limits on the effective Majorana neutrino mass of 36 - 156 meV with various nuclear matrix element calculations.
It is the first test for inverted mass ordering.
DOI: https://doi.org/10.22323/1.421.0067
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