Speaker
Description
The NEXT collaboration seeks to discover the neutrinoless double beta decay (ββ0ν) of Xe-136 using a high-pressure gas time projection chamber with electroluminesence gain and optical read-out. An initial medium-scale prototype, NEXT-White, with 5-kg of xenon was operational at the Laboratorio Subterraneo de Canfranc (LSC) from 2016 to 2021. This prototype has proven the outstanding performance of the NEXT technology in terms of energy resolution (<1% FWHM at 2.6 MeV) and precise event topology reconstruction, crucial for distinguishing signal from background events. In this talk, I will review the performance of the NEXT-White detector and present the measurement of the half-life of the double beta decay (ββ2ν) and the derived limits on the half-life of the ββ0ν decay. The results were obtained with both a background-model-dependent approach and a novel direct background-subtraction technique using a combination of 271.6 days of Xe-enriched data and 208.9 days of Xe-depleted data.
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