Tuning the decay time of liquid scintillators

Sabot, Benoît; Dutsov, Chavdar; Bertrand, Guillaume; Mitev, K.

doi:10.1016/j.jlumin.2021.118021

Cited by 3 publications

(4 citation statements)

References 39 publications

(36 reference statements)

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“…Regarding the time constants, all increase during cooling (Fig. 12), consistent with other measurements of pure pyrene crystals [15] and of pyrene in PMMA [17], and also consistent with pyrene in solutions at higher temperatures [14]. We attribute this as well to the shutting down of non-radiative decay channels during cooling.…”

Section: Discussionsupporting

confidence: 89%

“…In certain cases, for instance to identify different regions of the detector [12], it may be advantageous for the WLS to have significantly longer time constants than TPB and argon, enabling a form of spatial pulse-shape discrimination. A similar approach can also be used in liquid scintillator detectors for separation of Cherenkov and scintillation components [13] or other purposes [14].…”

Section: Introductionmentioning

confidence: 99%

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Fluorescence of pyrene-doped polystyrene films from room temperature down to 4 K for wavelength-shifting applications

Benmansour,

Ellingwood,

Hars

et al. 2021

Preprint

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In liquid argon-based particle detectors, slow wavelength shifters (WLSs) could be used alongside the common, nanosecond scale, WLS tetraphenyl butadiene (TPB) for background mitigation purposes. At room temperature, pyrene has a moderate fluorescence light yield (LY) and a time constant of the order of hundreds of nanoseconds. In this work, four pyrene-doped polystyrene films with various purities and concentrations were characterized in terms of LY and decay time constants in a range of temperature between 4 K and 300 K under ultraviolet excitation. These films were found to have a LY between 35 and 50% of that of evaporated TPB. All light yields increase when cooling down, while the decays slow down. At room temperature, we observed that pyrene purity is strongly correlated with emission lifetime: highest obtainable purity samples were dominated by decays with emission time constants of ∼ 250-280 ns, and lower purity samples were dominated by an ∼ 80 ns component. One sample was investigated further to better understand the monomer and excimer emissions of pyrene. The excimer-over-monomer intensity ratio decreases when the temperature goes down, with the monomer emission dominating below ∼ 87 K.

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Section: Discussionsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Fluorescence of pyrene-doped polystyrene films from room temperature down to 4 K for wavelength-shifting applications

Benmansour,

Ellingwood,

Hars

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…The light yields are between 35% and 50% of TPB at all temperatures (figure 11) [25]. Regarding the time constants, all increase during cooling (figure 12), consistent with other measurements of pure pyrene crystals [15] and of pyrene in PMMA [17], and also consistent with pyrene in solutions at higher temperatures [14]. We attribute this as well to the shutting down of non-radiative decay channels during cooling.…”

Section: Discussionsupporting

confidence: 86%

Section: Jinst 16 P12029mentioning

confidence: 99%

Fluorescence of pyrene-doped polystyrene films from room temperature down to 4 K for wavelength-shifting applications

Benmansour¹,

Ellingwood²,

Hars³

et al. 2021

J. Inst.

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In liquid argon-based particle detectors, slow wavelength shifters (WLSs) could be used alongside the common, nanosecond scale, WLS tetraphenyl butadiene (TPB) for background mitigation purposes. At room temperature, pyrene has a moderate fluorescence light yield (LY) and a time constant of the order of hundreds of nanoseconds. In this work, four pyrene-doped polystyrene films with various purities and concentrations were characterized in terms of LY and decay time constants in a range of temperature between 4 K and 300 K under ultraviolet excitation. These films were found to have a LY between 35 and 50% of that of evaporated TPB. All light yields increase when cooling down, while the decays slow down. At room temperature, we observed that pyrene purity is strongly correlated with emission lifetime: highest obtainable purity samples were dominated by decays with emission time constants of ∼ 250–280 ns, and lower purity samples were dominated by an ∼ 80 ns component. One sample was investigated further to better understand the monomer and excimer emissions of pyrene. The excimer-over-monomer intensity ratio decreases when the temperature goes down, with the monomer emission dominating below ∼ 87 K.

show abstract