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Search for Neutrinoless Double-β Decay with the Complete EXO-200 Dataset.

08:00 EDT 18th October 2019 | BioPortfolio

Summary of "Search for Neutrinoless Double-β Decay with the Complete EXO-200 Dataset."

A search for neutrinoless double-β decay (0νββ) in ^{136}Xe is performed with the full EXO-200 dataset using a deep neural network to discriminate between 0νββ and background events. Relative to previous analyses, the signal detection efficiency has been raised from 80.8% to 96.4±3.0%, and the energy resolution of the detector at the Q value of ^{136}Xe 0νββ has been improved from σ/E=1.23% to 1.15±0.02% with the upgraded detector. Accounting for the new data, the median 90% confidence level 0νββ half-life sensitivity for this analysis is 5.0×10^{25}  yr with a total ^{136}Xe exposure of 234.1 kg yr. No statistically significant evidence for 0νββ is observed, leading to a lower limit on the 0νββ half-life of 3.5×10^{25}  yr at the 90% confidence level.

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This article was published in the following journal.

Name: Physical review letters
ISSN: 1079-7114
Pages: 161802

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