The alpha induced scintillation of the wavelength shifter 1,1,4,4-tetraphenyl-1,3-butadiene (TPB) was studied to improve the understanding of possible surface alpha backgrounds in the DEAP dark matter search experiment. We found that vacuum deposited thin TPB films emit 882±210 photons per MeV under alpha particle excitation. The scintillation pulse shape consists of a double exponential decay with lifetimes of 11±5 and 275±10ns.

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Keywords Alpha scintillation, Dark matter, Deap-1, Tetraphenyl butadiene, TPB
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Journal Nuclear Inst. and Methods in Physics Research, A
Pollmann, T. (Tina), Boulay, M.G, & Kuźniak, M. (Marcin). (2011). Scintillation of thin tetraphenyl butadiene films under alpha particle excitation. Nuclear Inst. and Methods in Physics Research, A, 635(1), 127–130. doi:10.1016/j.nima.2011.01.045