Searching for Neutrinoless Double-Beta Decay of 136Xe with PandaX-4T
Abstract
We report the search for neutrinoless double-beta decay of 136Xe from the PandaX-4T experiment with a 3.7-tonne natural xenon target. The data reconstruction and the background modeling are optimized in the MeV energy region. A blind analysis is performed with data from the commissioning run and the first science run. No significant excess of signal over the background is observed. A lower limit on the half-life of 136Xe neutrinoless double-beta decay is established to be 2.1 × 1024~yr at the 90\% confidence level, with a 136Xe exposure of 44.6~kg·year. Our result represents the most stringent constraint from a natural xenon detector to date.
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