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arxiv 1001.4214 v1 pith:XOAWDNC2 submitted 2010-01-24 physics.ins-det

A Study of the Fluorescence Response of Tetraphenyl-butadiene

classification physics.ins-det
keywords lightexposurepureresponsescintillationtetraphenyl-butadieneallowapplication
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Tetraphenyl-butadiene (TPB) is a widely used fluorescent wavelength-shifter. A common application is in liquid-argon-based particle detectors, where scintillation light is produced in the UV at 128 nm. In liquid argon experiments, TPB is often employed to shift the scintillation light to the visible range in order to allow detection via standard photomultiplier tubes. This paper presents studies on the stability of TPB with time under exposure to light. We also examine batch-to-batch variations. We compare scintillation-grade TPB to 99% pure TPB response. In the 99% pure samples, we report a yellowing effect, and full degradation of the TPB emission-peak, upon extended exposure to light.

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