Temperature effects on light yield and pulse shape discrimination capability of siloxane based scintillators
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Regular Article - Experimental Physics
Temperature effects on light yield and pulse shape discrimination capability of siloxane based scintillators S. M. Carturan1,2,a , F. Pino1,2 , C. L. Fontana2,3 , S. Moretto2,3 , E. Zanazzi4,5 , R. Raggio1, W. Raniero1, A. Quaranta4,5 1
INFN, Laboratori Nazionali di Legnaro, Viale dell’Università 2, 35020 Legnaro, Padua, Italy Department of Physics and Astronomy “Galilei”, University of Padova, Via Marzolo 8, 35100 Padua, Italy 3 INFN-Sezione di Padova, Via Marzolo 8, 35100 Padua, Italy 4 Department of Industrial Engineering, University of Trento, Via Sommarive 9, 38123 Povo, Trento, Italy 5 INFN-Trento Institute of Fundamental Physics and Applications (TIFPA), Via Sommarive 14, 38123 Povo, Trento, Italy
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Received: 21 September 2020 / Accepted: 3 November 2020 © The Author(s) 2020
Abstract In this work, we report the study of temperature effects on light yield of siloxane-based scintillators and on n/γ discrimination capability, in terms of pulse shape discrimination (PSD). The solid scintillators are composed of phenyl containing polysiloxane (PMPS100), as a base polymer, loaded with moderate amounts (6 wt%) of 2,5diphenyloxazole (PPO) as a primary dye and Lumogen Violet (LV) as waveshifter. The samples were heated in the range of 60–150 ◦ C and scintillation performance were tested both after annealing for 24 h and in real time during heating. Light yield of siloxane-based scintillators containing 6 wt% PPO heated at 100 ◦ C is very close to the room-temperature value, while heating at 120 ◦ C causes a decrease of light yield (LY) of 17%. In addition, the figure of merit (FoM) for n/γ discrimination of the scintillator shows a sensible worsening of the discrimination performances in case of prolonged treatment at 120 ◦ C. Similar tests are made using the commercial plastic scintillator EJ-299 (currently named EJ-276), based on polyvinyltoluene (PVT). In this case, the light yield undergoes a much more rapid deterioration with annealing temperature, and at 70 ◦ C it is reduced to 60% of the original value. The discrimination capability of EJ-299 decreases upon heating at 70 ◦ C as well, with a 20% reduction of FoM; meanwhile for T > 70 ◦ C the mechanical and optical features are remarkably degraded. The mass loss of primary dye PPO from the siloxane scintillator as a function of treatment temperature and initial dye concentration has been evaluated and compared to the behaviour of EJ-299. This measurement allows to single out and characterize a series of processes occurring during heating, which are relevant to the whole performance of the system under study, such as sublimation at the interface, thermally induced photooxidation of components, a e-mail:
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diffusion of fluorophores from the polymer bulk to the surface. The variation in luminescence characteristics have been analyzed by excitation/fluorescence spectroscopy and timeresolved fluorescence spectroscopy, in order to correlate the annealing trea
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