Secondary scintillation yield of xenon with sub-percent levels of CO2 additive for rare-event detection

The NEXT collaboration

Research output: Contribution to journalArticle

Abstract

Xe–CO2 mixtures are important alternatives to pure xenon in Time Projection Chambers (TPC) based on secondary scintillation (electroluminescence) signal amplification with applications in the important field of rare event detection such as directional dark matter, double electron capture and double beta decay detection. The addition of CO2 to pure xenon at the level of 0.05–0.1% can reduce significantly the scale of electron diffusion from 10 mm/m to 2.5 mm/m, with high impact on the discrimination efficiency of the events through pattern recognition of the topology of primary ionization trails. We have measured the electroluminescence (EL) yield of Xe–CO2 mixtures, with sub-percent CO2 concentrations. We demonstrate that the EL production is still high in these mixtures, 70% and 35% relative to that produced in pure xenon, for CO2 concentrations around 0.05% and 0.1%, respectively. The contribution of the statistical fluctuations in EL production to the energy resolution increases with increasing CO2 concentration, being smaller than the contribution of the Fano factor for concentrations below 0.1% CO2.

Original languageEnglish (US)
Pages (from-to)663-671
Number of pages9
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume773
DOIs
StatePublished - Oct 10 2017

Keywords

  • Double beta decay
  • Electroluminescence
  • Neutrino
  • Rare event detection
  • Secondary scintillation
  • Xenon

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Fingerprint Dive into the research topics of 'Secondary scintillation yield of xenon with sub-percent levels of CO<sub>2</sub> additive for rare-event detection'. Together they form a unique fingerprint.

Cite this