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Liquid noble based particle detectors often use the organic wavelengthshifter 1,1,4,4- tetraphenyl-1,3-butadiene (TPB) which shifts UV scintillationlight to the visible regime, facilitating its detection, but which also canscintillate on its own. Dark matter searches based on this type of detectorcommonly rely on pulse-shape discrimination (PSD) for background mitigation.Alpha-induced scintillation therefore represents a possible background sourcein dark matter searches. The timing characteristics of this scintillationdetermine whether this background can be mitigated through PSD. We havetherefore characterized the pulse shape and light yield of alpha induced TPBscintillation at temperatures ranging from 300 K down to 4 K, with specialattention given to liquid noble gas temperatures. We find that the pulse shapesand light yield depend strongly on temperature. In addition, the significantcontribution of long time constants above ~50 K provides an avenue fordiscrimination between alpha decay events in TPB and nuclear-recoil events innoble liquid detectors.

Temperature dependence of alpha-induced scintillation in the 1,1,4,4-tetraphenyl-1,3-butadiene wavelength shifter