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- W2895566317 abstract "The nEXO experiment will operate an ultra-low background time projection chamber filled with 5 t of isotopically enriched liquid xenon (LXe) for the search for the neutrinoless double beta decay in Xe-136. The detector will use 4 m 2 of silicon photomultipliers (SiPMs) operated at about − 104 ∘ C to collect the scintillation light. There are strong requirements on the background levels, light collection efficiency and SiPM performance to set the most stringent limits on the half-life. Detecting the 0 ν β β -decay would have wide-spread implications for neutrino physics. The SiPMs need to be sensitive to the vacuum-ultraviolet scintillation light of LXe at 178 nm which is not given for off-the-shelf SiPMs. The SiPM performance requirements adopted by nEXO are (among others) a photon detection efficiency of at least 15% at 178 nm , a correlated avalanche probability of less than 20% and a low dark-rate. Additionally, the VUV-reflectance of the SiPM surface in LXe is an important parameter for optimal light collection and thus the energy resolution of nEXO. We present measurements with state-of-the-art VUV-sensitive SiPMs focusing on the surface VUV-reflectance in liquid xenon. • SiPM surfaces reflect up to 17% of incident VUV light when immersed in liquid xenon. • Due to the surface micro-structure, reflectance spectra reveal additional artefacts. • Knowing the surface reflectivity is vital for simulating large scale LXe detectors." @default.
- W2895566317 created "2018-10-12" @default.
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- W2895566317 date "2019-08-01" @default.
- W2895566317 modified "2023-10-01" @default.
- W2895566317 title "Reflectance of VUV-sensitive SiPM surfaces in liquid xenon" @default.
- W2895566317 cites W2031894577 @default.
- W2895566317 cites W2474889698 @default.
- W2895566317 doi "https://doi.org/10.1016/j.nima.2018.09.142" @default.
- W2895566317 hasPublicationYear "2019" @default.
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