The liquid-argon scintillation pulseshape in DEAP-3600

Adhikari, P.; Ajaj, Rahaf; Araujo, G. R.; Batygov, M.; Beltrán, B.; Bina, C. E.; Boulay, M. G.; Broerman, B.; Bueno, J. F.; Butcher, A.; Cai, B.; Cárdenas‐Montes, Miguel; Cavuoti, S.; Chen, Yulan; Cleveland, B. T.; Corning, J.; Daugherty, S. J.; Stéfano, P. Di; Dering, K.; Doria, L.; Duncan, F. A.; Dunford, M.; Erlandson, A.; Fatemighomi, N.; Fiorillo, G.; Flower, A.; Ford, R.; Gagnon, R.; Gallacher, D.; Garcés, E. A.; Abia, P. García; Garg, Sakshi; Giampa, P.; Goeldi, D.; Golovko, V. V.; Gorel, P.; Graham, K.; Grant, D.; Grobov, A.; Hallin, A. L.; Hamstra, M.; Harvey, P. J.; Hearns, C.; Ilyasov, A.; Joy, A.; Jillings, C.; Kamaev, O.; Kaur, G.; Kemp, A.; Kochanek, I.; Kuźniak, M.; Langrock, S.; Zia, F. La; Lehnert, B.; Levashko, N.; Li, X.; Litvinov, O.; Lock, James A.; Longo, Giuseppe; Machulin, I.; Majewski, P.; McDonald, A. B.; McElroy, Thomas; McGinn, T.; McLaughlin, J.; Mehdiyev, R.; Mielnichuk, C.; Monroe, J.; Nadeau, P.; Nantais, C.; Ng, C.; Noble, A. J.; Oliviéro, G.; Ouellet, C.; Pal, S.; Pasuthip, P.; Peeters, S. J. M.; Pesudo, V.; Piro, M.‐C.; Pollmann, T. R.; Rand, E. T.; Rethmeier, C.; Retière, F.; García, E.; Sánchez-Pastor, T.; Santorelli, R.; Seeburn, N.; Skensved, P.; Smith, B. C.; Smith, N. J. T.; Sonley, T. J.; Stainforth, R.; Stone, Connor; Strickland, V.; Stringer, M.; Sur, B.; Vázquez‐Jáuregui, E.; Veloce, L. M.; Viel, S.; Walding, J.; Waqar, Moaz; Ward, M.; Westerdale, S.; Willis, J. L.; Zuñiga-Reyes, A.

doi:10.1140/epjc/s10052-020-7789-x

Cited by 24 publications

(32 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We note however, that the TPB emission time [56] combined with LAr scintillation microphysics [60] has been suggested as a culprit for the so-called intermediate time component, with a lifetime of ∼40 ns observed in a few measurements [120].…”

Section: Impact Of Wls On Dark Matter Background Mitigation 621 Wls Effects In Pulse Shape Discriminationmentioning

confidence: 81%

“…The data revealed even longer ∼ms scale delayed emission and generally were well described with the Voltz-Laustriat [59] model, developed to describe the triplet-triplet interaction dynamics in scintillators. Such a TPB time response model, combined with a LAr scintillation model, which included a LAr physics-driven intermediate component, and the instrumental response, was then used to successfully fit the LAr pulse shapes in the DEAP-3600 detector [60].…”

Section: Tpbmentioning

confidence: 99%

See 1 more Smart Citation

Wavelength Shifters for Applications in Liquid Argon Detectors

Kuźniak

Szelc

2020

Instruments

View full text Add to dashboard Cite

Wavelength shifters and their applications for liquid argon detectors have been a subject of extensive R&D procedures over the past decade. This work reviews the most recent results in this field. We compare the optical properties and usage details together with the associated challenges for various wavelength shifting solutions. We discuss the current status and potential future R&D directions for the main classes of wavelength shifters.

show abstract

Section: Impact Of Wls On Dark Matter Background Mitigation 621 Wls Effects In Pulse Shape Discriminationmentioning

confidence: 81%

Section: Tpbmentioning

confidence: 99%

Wavelength Shifters for Applications in Liquid Argon Detectors

Kuźniak

Szelc

2020

Instruments

View full text Add to dashboard Cite

show abstract

“…A central aspect of either single or dual phase (gas-liquid) noble element detectors is their efficient collection and detection of the vacuum ultraviolet (VUV) scintillation photons, which provides calorimetric data, event time for the 3D event reconstruction, and particle identification capability [11,12]. Experimental information, obtained largely from the closely related fields of photo-chemistry, plasma and laser physics, allows attributing this characteristic scintillation to the bond created between excited and ground state atoms through 3body collisions (see, e.g., [13]).…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic analysis of the gaseous argon scintillation with a wavelength sensitive particle detector

et al. 2021

Self Cite

View full text Add to dashboard Cite

We performed a time-resolved spectroscopic study of the VUV/UV scintillation of gaseous argon as a function of pressure and electric field, by means of a wavelength sensitive detector operated with different radioactive sources. Our work conveys new evidence of distinctive features of the argon light which are in contrast with the general assumption that, for particle detection purposes, the scintillation can be considered to be largely monochromatic at 128 nm (second continuum). The wavelength and time-resolved analysis of the photon emission reveal that the dominant component of the argon scintillation during the first tens of ns is in the range [160, 325] nm. This light is consistent with the third continuum emission from highly charged argon ions/molecules. This component of the scintillation is field-independent up to 25 V/cm/bar and shows a very mild dependence with pressure in the range [1, 16] bar. The dynamics of the second continuum emission is dominated by the excimer formation time, whose variation as a function of pressure has been measured. Additionally, the time and pressure-dependent features of electron-ion recombination, in the second continuum band, have been measured. This study opens new paths toward a novel particle identification technique based on the spectral information of the noble-elements scintillation light.

show abstract

“…The DEAP-3600 PMTs have an AP probability of approximately 10 % [11,21]. Since AP occurs in specific time windows between 100 ns and 10,000 ns, it modifies the pulse-shape [22], and since AP is a statistical process, it also contributes to the variance of the q PE count. The bulk of the variance in q PE , however, is due to the width of the SPE charge distribution.…”

Section: Photon Countingmentioning

confidence: 99%

“…We denote these PDFs p(t) nr and p(t) er for nuclear recoils and electron recoils respectively. A detailed discussion of p(t) er can be found in [22]. The singlet fraction, and therefore p(t) nr and p(t) er , has a dependence on energy.…”

Section: Psd Parameter Definitionsmentioning

confidence: 99%

Pulse-shape discrimination against low-energy Ar-39 beta decays in liquid argon with 4.5 tonne-years of DEAP-3600 data

Adhikari¹,

Ajaj²,

Alpízar-Venegas³

et al. 2021

Eur. Phys. J. C

Self Cite

View full text Add to dashboard Cite

The DEAP-3600 detector searches for the scintillation signal from dark matter particles scattering on a 3.3 tonne liquid argon target. The largest background comes from $$^{39}\text{ Ar }$$ 39 Ar beta decays and is suppressed using pulse-shape discrimination (PSD). We use two types of PSD estimator: the prompt-fraction, which considers the fraction of the scintillation signal in a narrow and a wide time window around the event peak, and the log-likelihood-ratio, which compares the observed photon arrival times to a signal and a background model. We furthermore use two algorithms to determine the number of photons detected at a given time: (1) simply dividing the charge of each PMT pulse by the mean single-photoelectron charge, and (2) a likelihood analysis that considers the probability to detect a certain number of photons at a given time, based on a model for the scintillation pulse shape and for afterpulsing in the light detectors. The prompt-fraction performs approximately as well as the log-likelihood-ratio PSD algorithm if the photon detection times are not biased by detector effects. We explain this result using a model for the information carried by scintillation photons as a function of the time when they are detected.

show abstract

The liquid-argon scintillation pulseshape in DEAP-3600

Cited by 24 publications

References 56 publications

Wavelength Shifters for Applications in Liquid Argon Detectors

Wavelength Shifters for Applications in Liquid Argon Detectors

Spectroscopic analysis of the gaseous argon scintillation with a wavelength sensitive particle detector

Pulse-shape discrimination against low-energy Ar-39 beta decays in liquid argon with 4.5 tonne-years of DEAP-3600 data

Contact Info

Product

Resources

About