Temperature-dependent fluorescence emission spectra of acrylic (PMMA) and tetraphenyl butadiene (TPB) excited with UV light
JOURNAL OF INSTRUMENTATION(2020)
摘要
Acrylic (poly(methyl methacrylate) or PMMA) is commonly used as a material for vessels to hold scintillating liquids in rare-event searches. Certain types of PMMA can fluoresce with a low efficiency at room temperature. We have investigated the fluorescence spectra under 280 nm ultraviolet (UV) excitation of the PMMA used in the DEAP-3600 dark matter search at various low temperatures. Fluorescence of this PMMA is observed, with an increasing intensity as the sample is cooled from a temperature of 300K down to 4 K. The common wavelength-shifter tetraphenyl butadiene (TPB) is also measured for use as a reference.
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关键词
Scintillators, scintillation and light emission processes (solid, gas and liquid scintillators),Noble liquid detectors (scintillation, ionization, double-phase),Dark Matter detectors (WIMPs, axions, etc.),Large detector systems for particle and astroparticle physics
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