Prospects of charge signal analyses in liquid xenon TPCs with proportional scintillation in the liquid phase

Abstract

As liquid xenon TPCs increase in target mass while pursuing the direct detection of WIMP dark matter, the technical challenges arising due to their size call for new solutions and open the discussion on alternative detector concepts. Proportional scintillation in liquid xenon allows for a single-phase design evading all problems related to the liquid-gas interface and the precise gas gap required in a dual-phase TPC. Aside from a different scintillation mechanism, the successful detection- and analysis scheme of state-of-the-art experiments is maintained in this approach. We study the impact on charge signal analysis in a single-phase detector of DARWIN dimensions, where the fast timing of the proportional scintillation signal allows for the precise identification of the single electrons in the ionisation signal. Such a discrete electron-counting approach leads to a better signal resolution for low energies when compared to the classical dual-phase continuous method. The absence of the liquid-gas interface further benefits the S2-only energy resolution significantly. This reduces the uncertainties from the scintillation and signal-detection process to a level significantly below the irreducible fluctuation in the primary ionisation. Exploiting the precise electron time information further allows for a powerful single vs.~multiple site interaction discrimination with 93% rejection efficiency and 98% signal acceptance. This outperforms the design goal of the DARWIN observatory by a reduction factor of 4.2 in non-rejected multiple site neutron events.

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Cited by in corpus (8)

• The XLZD Design Book: Towards the Next-Generation Liquid Xenon Observatory for Dark Matter and Neutrino Physics
• Low Energy Electronic Recoils and Single Electron Detection with a Liquid Xenon Proportional Scintillation Counter
• Novel electron and photon recording concepts in noble-liquid detectors
• The XeBRA platform for liquid xenon time projection chamber development
• GPU-based optical simulation of the DARWIN detector
• First observation of liquid xenon electroluminescence with a Microstrip Plate
• Electron transfer efficiency in liquid xenon across THGEM holes
• Snowmass Instrumentation Frontier IF08 Topical Group Report: Noble Element Detectors