SiPM-matrix readout of two-phase argon detectors using electroluminescence in the visible and near infrared range

Aalseth, C E, Abdelhakim, S, Agnes, P, Ajaj, R, Albuquerque, I F M, Alexander, T, Alici, A, Alton, A K, Amaudruz, P, Ameli, F, Anstey, J, Antonioli, P, Arba, M, Arcelli, S, Peeters, Simon, The DarkSide-20k collaboration, and others, (2021) SiPM-matrix readout of two-phase argon detectors using electroluminescence in the visible and near infrared range. European Physical Journal C: Particles and Fields, 81. a153 1-17. ISSN 1434-6044

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Proportional electroluminescence (EL) in noble gases is used in two-phase detectors for dark matter searches to record (in the gas phase) the ionization signal induced by particle scattering in the liquid phase. The “standard” EL mechanism is considered to be due to noble gas excimer emission in the vacuum ultraviolet (VUV). In addition, there are two alternative mechanisms, producing light in the visible and near infrared (NIR) ranges. The first is due to bremsstrahlung of electrons scattered on neutral atoms (“neutral bremsstrahlung”, NBrS). The second, responsible for electron avalanche scintillation in the NIR at higher electric fields, is due to transitions between excited atomic states. In this work, we have for the first time demonstrated two alternative techniques of the optical readout of two-phase argon detectors, in the visible and NIR range, using a silicon photomultiplier matrix and electroluminescence due to either neutral bremsstrahlung or avalanche scintillation. The amplitude yield and position resolution were measured for these readout techniques, which allowed to assess the detection threshold for electron and nuclear recoils in two-phase argon detectors for dark matter searches. To the best of our knowledge, this is the first practical application of the NBrS effect in detection science.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
SWORD Depositor: Mx Elements Account
Depositing User: Mx Elements Account
Date Deposited: 06 Jul 2021 07:11
Last Modified: 28 Feb 2022 13:31

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Project NameSussex Project NumberFunderFunder Ref
STFC Experimental Particle Physics 2018 Consolidated GrantG2740STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCILST/S000798/1