Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/328278
Type: Artigo
Title: Delayed Light Emission Of Tetraphenyl-butadiene Excited By Liquid Argon Scintillation Light. Current Status And Future Plans
Delayed light emission of tetraphenyl-butadiene excited by liquid argon scintillation light: current status and future plans
Author: Segreto, E.
Machado, A. A.
Araujo, W.
Teixeira, V.
Abstract: Tetraphenyl-butadiene is the wavelength shifter most widely used in combination with liquid argon. The latter emits scintillation photons with a wavelength of 127 nm that need to be downshifted to be detected by photomultipliers with glass or quartz windows. Tetraphenyl-butadiene has been demonstrated to have an extremely high conversion efficiency, possibly higher than 100% for 127 nm photons, while there is no precise information about the time dependence of its emission. It is usually assumed to be exponentially decaying with a characteristic time of the order of one ns, as an extrapolation from measurements with exciting radiation in the near UV. This work shows that tetraphenyl-butadiene, when excited by 127 nm photons, re-emits photons not only with a very short decay time, but also with slower ones due to triplet states de-excitations. This fact can strongly contribute to clarifying the anomalies in liquid-argon scintillation light reported in the literature since the 1970s. Precision measurements of the properties of TPB, when excited by Vacuum Ultra Violet photons are being carried on at the Brazilian Synchrotron Light Laboratory in Campinas (State of Sao Paulo).
Tetraphenyl-butadiene is the wavelength shifter most widely used in combination with liquid argon. The latter emits scintillation photons with a wavelength of 127 nm that need to be downshifted to be detected by photomultipliers with glass or quartz windows. Tetraphenyl-butadiene has been demonstrated to have an extremely high conversion efficiency, possibly higher than 100% for 127 nm photons, while there is no precise information about the time dependence of its emission. It is usually assumed to be exponentially decaying with a characteristic time of the order of one ns, as an extrapolation from measurements with exciting radiation in the near UV. This work shows that tetraphenyl-butadiene, when excited by 127 nm photons, re-emits photons not only with a very short decay time, but also with slower ones due to triplet states de-excitations. This fact can strongly contribute to clarifying the anomalies in liquid-argon scintillation light reported in the literature since the 1970s. Precision measurements of the properties of TPB, when excited by Vacuum Ultra Violet photons are being carried on at the Brazilian Synchrotron Light Laboratory in Campinas (State of Sao Paulo).
Subject: Scintillators, Scintillation And Light Emission Processes (solid, Gas And Liquid Scintillators)
Noble Liquid Detectors (scintillation, Ionization, Double-phase)
Photoemission
Cryogenic Detectors
Cintiladores, Fotoemissão, Detectores
Country: Reino Unido
Editor: Institute of Physics Publishing
Citation: Journal Of Instrumentation. Iop Publishing Ltd, v. 11, p. , 2016.
Rights: fechado
Identifier DOI: 10.1088/1748-0221/11/02/C02010
Address: http://iopscience.iop.org/article/10.1088/1748-0221/11/02/C02010/meta
Date Issue: 2016
Appears in Collections:Unicamp - Artigos e Outros Documentos

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