Photon emission and atomic collision processes in two-phase argon doped with xenon and nitrogen

Abstract

We present a comprehensive analysis of photon emission and atomic collision processes in two-phase argon doped with xenon and nitrogen. The dopants are aimed to convert the VUV emission of pure Ar to the UV emission of the Xe dopant in the liquid phase and to the near UV emission of the N2 dopant in the gas phase. Such a mixture is relevant to two-phase dark matter and low energy neutrino detectors, with enhanced photon collection efficiency for primary and secondary scintillation signals. Based on this analysis, we show that the recently proposed hypothesis of the enhancement of the excitation transfer from Ar to N2 species in the two-phase mode is either incorrect or needs assumption about a new extreme mechanism of excitation transfer coming into force at lower temperatures, in particular that of the resonant excitation transfer via ArN2 compound (van der Waals molecule).

arXiv comment6 pages, 1 figure, 1 table

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• Neutral bremsstrahlung and excimer electroluminescence in noble gases and its relevance to two-phase dark matter detectors
• Electron transport and electric field simulations in two-phase detectors with THGEM electrodes
• Neutral bremsstrahlung in two-phase argon electroluminescence: further studies and possible applications
• Measurement of the ionization yield of nuclear recoils in liquid argon using a two-phase detector with electroluminescence gap
• Xenon doping of Liquid Argon in ProtoDUNE Single Phase
• Study of cryogenic photomultiplier tubes for the future two-phase cryogenic avalanche detector
• Fast component re-emission in Xe-doped liquid argon
• Puzzling time properties of proportional electroluminescence in two-phase argon detectors for dark matter searches
• Further studies of proportional electroluminescence in two-phase argon
• Doping Liquid Argon with Xenon in ProtoDUNE Single-Phase: Effects on Scintillation Light
• Observation of unusual slow components in electroluminescence signal of two-phase argon detector
• Some considerations about cosmogenic production of radioactive isotopes in Ar as target for the next neutrino experiments
• Study of visible-light emission in pure and methane-doped liquid argon
• Observation of primary scintillations in the visible range in liquid argon doped with methane
• First observation of neutral bremsstrahlung electroluminescence in liquid argon
• Using ${}^{22}$Na and ${}^{83\mathrm{m}}$Kr to calibrate and study the properties of scintillation in xenon-doped liquid argon
• About detecting very low mass black holes in LAr detectors
• Unraveling the puzzle of slow components in gaseous argon of two-phase detectors for dark matter searches using Thick Gas Electron Multiplier
• Possible evidence for the production of Ar${}_2^{\ast -}$ metastable negative molecular ions in gaseous argon of two-phase detectors for dark matter searches