Quartz fluorescence backgrounds in xenon particle detectors

P. Sorensen; R. Gibbons

Quartz fluorescence backgrounds in xenon particle detectors

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arxiv 2505.08067 v2 pith:X2QIU4WO submitted 2025-05-12 hep-ex physics.ins-det

P. Sorensen , R. Gibbons This is my paper

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It has been known for almost a decade that delayed photon noise with a power law time profile follows scintillation pulses in liquid xenon particle detectors. The origin of the noise has remained unknown, and in the past two years, has become an overwhelming background for low-threshold dark matter searches aimed at O(10) GeV dark matter particle masses, as well as measurements of coherent neutrino-nucleus scattering of 8B solar neutrinos. We have performed a comprehensive series of tests in a small liquid xenon cell at LBL, from which we conclude that the dominant component of this delayed photon noise is due to UV-induced fluorescence of quartz photosensor windows.

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Electroluminescence Yield Measurements in Xenon Gas with the NEXT-DEMO++ Detector
physics.ins-det 2026-04 unverdicted novelty 5.0 of 10

Electroluminescence yield measurements in xenon reveal a modest 5% change in the slope of the reduced yield Y/p above 5 bar pressure.

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