PoS - Proceedings of Science
Volume 421 - Neutrino Oscillation Workshop (NOW2022) - Session IV. Neutrino masses, states and interactions
Recent results from KamLAND-Zen
K. Ichimura
Full text: pdf
Pre-published on: December 28, 2022
Published on:
Abstract
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
How to cite

Metadata are provided both in "article" format (very similar to INSPIRE) as this helps creating very compact bibliographies which can be beneficial to authors and readers, and in "proceeding" format which is more detailed and complete.

Open Access
Creative Commons LicenseCopyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.