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Direct comparison of PEN and TPB wavelength shifters in a liquid argon detector

Author(s): Boulay, MG; Camillo, V; Canci, N; Choudhary, S; Consiglio, L; et al

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Abstract: <jats:title>Abstract</jats:title><jats:p>A large number of particle detectors employ liquid argon as their target material owing to its high scintillation yield and its ability to drift ionization charge over large distances. Scintillation light from argon is peaked at 128 nm and a wavelength shifter is required for its efficient detection. In this work, we directly compare the light yield achieved in two identical liquid argon chambers, one of which is equipped with polyethylene naphthalate (PEN) and the other with tetraphenyl butadiene (TPB) wavelength shifter. Both chambers are lined with enhanced specular reflectors and instrumented with SiPMs with a coverage fraction of approximately 1%, which represents a geometry comparable to the future large scale detectors. We measured the light yield of the PEN chamber to be  39.4<jats:inline-formula><jats:alternatives><jats:tex-math>$$\,\pm \,$$</jats:tex-math><mml:math xmlns:mml=""> <mml:mrow> <mml:mspace /> <mml:mo>±</mml:mo> <mml:mspace /> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula>0.4(stat)<jats:inline-formula><jats:alternatives><jats:tex-math>$$\,\pm \,$$</jats:tex-math><mml:math xmlns:mml=""> <mml:mrow> <mml:mspace /> <mml:mo>±</mml:mo> <mml:mspace /> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula>1.9(syst)% of the yield of the TPB chamber. Using a Monte Carlo simulation this result is used to extract the wavelength shifting efficiency of PEN relative to TPB equal to 47.2<jats:inline-formula><jats:alternatives><jats:tex-math>$$\,\pm \,$$</jats:tex-math><mml:math xmlns:mml=""> <mml:mrow> <mml:mspace /> <mml:mo>±</mml:mo> <mml:mspace /> </mml:mrow> </mml:math></jats:alternatives></jats:inline-formula>5.7%. This result paves the way for the use of easily available PEN foils as a wavelength shifter, which can substantially simplify the construction of future liquid argon detectors.</jats:p>
Publication Date: 13-Dec-2021
Electronic Publication Date: 13-Dec-2021
Citation: Boulay, MG, Camillo, V, Canci, N, Choudhary, S, Consiglio, L, Flammini, A, Galbiati, C, Ghiano, C, Gola, A, Horikawa, S, Kachru, P, Kochanek, I, Kondo, K, Korga, G, Kuźniak, M, Kuźwa, M, Leonhardt, A, Łęcki, T, Mazzi, A, Moharana, A, Nieradka, G, Paternoster, G, Pollmann, TR, Razeto, A, Sablone, D, Sworobowicz, T, Szelc, AM, Türkoğlu, C, Wang, H. (2021). Direct comparison of PEN and TPB wavelength shifters in a liquid argon detector. The European Physical Journal C, 81 (12), 10.1140/epjc/s10052-021-09870-7
DOI: doi:10.1140/epjc/s10052-021-09870-7
ISSN: 1434-6044
EISSN: 1434-6052
Language: en
Type of Material: Journal Article
Journal/Proceeding Title: The European Physical Journal C
Version: Final published version. This is an open access article.

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