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As part of the R&D of the liquid argon instrumentation of LEGEND-200 and LEGEND-1000, our group has been characterizing wavelength-shifting materials such as tetraphenyl butadiene (TPB) and polyethylene naphthalate (PEN).
In this scope, we have recently published the paper "R&D of wavelength-shifting reflectors and characterization of the quantum efficiency of TPB and PEN in liquid argon". In this work, the absolute quantum efficiency of TPB and PEN in LAr (at 87K) were estimated for the first time. A summary of the R&D of the wavelength shifting reflectors for LEGEND-200 and the results from the paper were recently presented by Gabriela R. Araujo at the neutrino and dark matter (NDM 2022) conference this month.
