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Title: Measurement of the Xe136 two-neutrino double-β-decay half-life via direct background subtraction in NEXT

Journal Article · · Phys.Rev.C

We report a measurement of the half-life of the Xe 136 two-neutrino double- β decay performed with a novel direct-background-subtraction technique. The analysis relies on the data collected with the NEXT-White detector operated with Xe 136 -enriched and Xe 136 -depleted xenon, as well as on the topology of double-electron tracks. With a fiducial mass of only 3.5 kg of Xe, a half-life of 2 . 34 - 0.46 + 0.80 (stat) - 0.17 + 0.30 (sys) × 10 21 yr is derived from the background-subtracted energy spectrum. The presented technique demonstrates the feasibility of unique background-model-independent neutrinoless double- β -decay searches.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Argonne National Laboratory (ANL), Argonne, IL (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Contributing Organization:
DOE Contract Number:
Report Number(s):
FERMILAB-PUB-22-395-ND-SCD; arXiv:2111.11091;
Journal Information:
Phys.Rev.C, Vol. 105, Issue 5
Country of Publication:
United States

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