Xenon-doped liquid argon has been proposed as a good alternative to pure
liquid argon in scintillation detectors. In this study, we report on the
measurement of the time profile of scintillation light emitted from xenon-doped
liquid argon with molar concentrations up to 1600 ppm. A compact setup has been
developed for this study, with silicon photomultiplier (SiPM) as the
photosensor and 210Po and 90Sr as scintillation
sources. An effective model based on the de-excitation processes has been
developed to describe the data. The results show that xenon-doped liquid argon
is a good fast scintillator and can be used in lieu of tetraphenyl butadiene
(TPB) in a way that preserves its capability for particle identification via
pulse shape discrimination (PSD)