Demonstration of the event identification capabilities of the NEXT-White detector

The NEXT collaboration

Research output: Contribution to journalArticle

Abstract

In experiments searching for neutrinoless double-beta decay, the possibility of identifying the two emitted electrons is a powerful tool in rejecting background events and therefore improving the overall sensitivity of the experiment. In this paper we present the first measurement of the efficiency of a cut based on the different event signatures of double and single electron tracks, using the data of the NEXT-White detector, the first detector of the NEXT experiment operating underground. Using a 228Th calibration source to produce signal-like and background-like events with energies near 1.6 MeV, a signal efficiency of 71.6 ± 1.5 stat± 0.3 sys% for a background acceptance of 20.6 ± 0.4 stat± 0.3 sys% is found, in good agreement with Monte Carlo simulations. An extrapolation to the energy region of the neutrinoless double beta decay by means of Monte Carlo simulations is also carried out, and the results obtained show an improvement in background rejection over those obtained at lower energies. [Figure not available: see fulltext.]

Original languageEnglish (US)
Article number52
JournalJournal of High Energy Physics
Volume2019
Issue number10
DOIs
StatePublished - Oct 1 2019

Keywords

  • Dark Matter and Double Beta Decay (experiments)

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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