Sensitivity of a tonne-scale NEXT detector for neutrinoless double beta decay searches

Abstract

The Neutrino Experiment with a Xenon TPC (NEXT) searches for the neutrinoless double-beta decay of Xe-136 using high-pressure xenon gas TPCs with electroluminescent amplification. A scaled-up version of this technology with about 1 tonne of enriched xenon could reach in less than 5 years of operation a sensitivity to the half-life of neutrinoless double-beta decay decay better than 1E27 years, improving the current limits by at least one order of magnitude. This prediction is based on a well-understood background model dominated by radiogenic sources. The detector concept presented here represents a first step on a compelling path towards sensitivity to the parameter space defined by the inverted ordering of neutrino masses, and beyond.

arXiv comment22 pages, 11 figures

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• Ba${}^{2+}$ ion trapping by organic submonolayer: towards an ultra-low background neutrinoless double beta decay detector
• Boosting background suppression in the NEXT experiment through Richardson-Lucy deconvolution
• Large Low Background kTon-Scale Liquid Argon Time Projection Chambers
• Partial muon capture rates in $A=3$ and $A=6$ nuclei with chiral effective field theory
• Graph neural network for 3D classification of ambiguities and optical crosstalk in scintillator-based neutrino detectors
• Theoretical and Experimental Challenges in the Measurement of Neutrino Mass