Precision measurement of the specific activity of $$^{39}$$Ar in atmospheric argon with the DEAP-3600 detector

P., Adhikari,; Ajaj, Rahaf; Alpízar-Venegas, M.; Amaudruz, P.; Anstey, James; Araujo, G. R.; Auty, D. J.; Baldwin, Martin; Batygov, M.; Beltrán, B.; Benmansour, H.; Bina, C. E.; Bonatt, J.; Bonivento, W.; G., Boulay, M.; Broerman, B.; Bueno, J. F.; Burghardt, P. M.; Butcher, A.; Cadeddu, M.; Cai, B.; Cárdenas‐Montes, Miguel; Cavuoti, S.; Chen, M.; Chen, Y.; S., Choudhary,; Cleveland, B. T.; M., Corning, J.; R., Crampton,; D., Cranshaw,; Daugherty, S. J.; P., DelGobbo,; Dering, K.; P., Di Stefano,; J., DiGioseffo,; Dolganov, G.; Doria, L.; Duncan, F. A.; Dunford, M.; Ellingwood, E.; Erlandson, A.; S., Farahani, S.; Fatemighomi, N.; Fiorillo, G.; Schepers, Florian; Flower, A.; Ford, R.; Gagnon, R.; Gallacher, D.; García, Abia, P.; Garg, Sakshi; Giampa, P.; Giménez-Alcázar, A.; Goeldi, D.; V., Golovko, V.; Gorel, P.; Graham, K.; Grant, D. R.; Grobov, A.; Hallin, A. L.; Hamstra, M.; Harvey, P. J.; S., Haskins,; Hearns, C.; Hu, Jun; Hucker, J.; Hugues, T.; Ilyasov, A.; Jigmeddorj, B.; J., Jillings, C.; Joy, A.; Kamaev, O.; Kaur, G.; Kemp, A.; Kuźniak, M.; Zia, F. La; Laí, M.; Langrock, S.; Lehnert, B.; Leonhardt, A.; LePage-Bourbonnais, J.; Levashko, N.; Lidgard, J.; Lindner, T.; Lissia, M.; Lock, James A.; Luzzi, L.; Machulin, I.; Majewski, P.; Maru, A.; Mason, James Paul; B., McDonald, A.; McElroy, Thomas; McGinn, T.; McLaughlin, Joe; Mehdiyev, R.; Mielnichuk, C.; L., Mirasola,; Monroe, J.; Nadeau, P.; Nantais, C.; Ng, C.; Noble, A. J.; O’Dwyer, E.; Oliviéro, G.; Ouellet, C.; Pal, S.; D., Papi,; Pasuthip, P.; Peeters, S. J. M.; Perry, M. G.; Pesudo, V.; Picciau, E.; Piro, M.‐C.; R., Pollmann, T.; F., Rad,; Rand, E. T.; Rethmeier, C.; Retière, F.; García, Isabel Rodríguez; L., Roszkowski,; Ruhland, J. B.; Santorelli, R.; Schuckman, F.; Seeburn, N.; Seth, S.; V., Shalamova,; Singhrao, K.; Skensved, P.; Smith, Nell; Smith, B. C.; K., Sobotkiewich,; Sonley, T. J.; Sosiak, J.; Soukup, J.; Stainforth, R.; Stone, Connor; Strickland, V.; Stringer, M.; Sur, B.; Tang, J.; Vázquez-Jáuregui, E.; Veloce, L. M.; Viel, S.; Vyas, B.; Walczak, M.; Walding, J.; Ward, M.; Westerdale, S.; Willis, J. L.; Zuñiga-Reyes, A.

doi:10.1140/epjc/s10052-023-11678-6

Cited by 4 publications

(6 citation statements)

References 30 publications

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“…Recent measurements of specific atmospheric 39 Ar activity made in various underground laboratories [43][44][45][46] show a value that is very close to the old specific atmospheric 39 Ar activity reported in Loosli et al (1970) [47] and to the activity of argon samples extracted in 1940 and between 1959 and 1960. 39 Ar half-life uncertainties in specific atmospheric 39 Ar activity have magnified effects on specific activities reported previously because of their appearance in Equation 11.…”

Section: Zeldes Et Al (1952)supporting

confidence: 68%

Application of the most frequent value method for $$^{39}$$Ar half-life determination

Golovko

2023

Eur. Phys. J. C

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An evaluation method supported by robust statistical analysis was applied to historical measurements of $$^{39}$$ 39 Ar half-life. The method, based on the most frequent value (MFV) approach combined with bootstrap analysis, provides a more robust way to estimate $$^{39}$$ 39 Ar half-life, and results in $$T_{1/2}($$ T 1 / 2 ( MFV$$) = 268.2^{+3.1}_{-2.9}$$ ) = 268 . 2 - 2.9 + 3.1 years with uncertainty corresponding to the 68% confidence level. The uncertainty is a factor of 3 smaller than that of the most precise re-calculated $$^{39}$$ 39 Ar half-life measurements by Stoenner et al. and a factor of 2.7 smaller than that of the adopted half-life value in nuclear data sheets. Recently, the specific activity of the beta decay of $$^{39}$$ 39 Ar in atmospheric argon was measured in several underground facilities. Applying the MFV method to a specific activity of $$^{39}$$ 39 Ar from underground measurements results in $$ SA_{{^{39}\text {Ar}}/\text {Ar}}(\text {MFV}) = 0.966^{+0.010}_{-0.018} \, \, \text {Bq/kg}_{\text {atmAr}}$$ S A 39 Ar / Ar ( MFV ) = 0 . 966 - 0.018 + 0.010 Bq/kg atmAr with uncertainty corresponding to the 68% confidence level. In this paper the method to determine the half-life of $$^{39}$$ 39 Ar using the specific activity of $$^{39}$$ 39 Ar in atmospheric argon is also discussed.

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Section: Zeldes Et Al (1952)supporting

confidence: 68%

Application of the most frequent value method for $$^{39}$$Ar half-life determination

Golovko

2023

Eur. Phys. J. C

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“…Atmospheric argon has (0.964 ± 0.024) Bq/kg of 39 Ar [4,5]. Its 565 keV-endpoint 𝛽-decay provides a large dataset, used to model light production and propagation [6,7].…”

Section: Jinst 19 C02008mentioning

confidence: 99%

“…DEAP-3600 is a dark matter (DM) direct detection experiment operating at SNOLAB, in Sudbury, Canada, since August 2016 [1]. As shown in figure 1, it views (3269 ± 24) kg LAr [4] in a 170 cm-inner diameter acrylic vessel (AV) with an array of 255 photomultiplier tubes (PMTs), via 45 cm-long acrylic light guides, in a stainless steel shell within a water Cherenkov muon veto. To detect VUV LAr scintillation light, the AV's inner surfaces are coated with tetraphenyl butadiene (TPB), a wavelength shifter that re-emits photons around 420 nm.…”

Section: Introductionmentioning

confidence: 99%

The DEAP-3600 liquid argon optical model and NEST updates

Westerdale

2024

J. Inst.

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As liquid argon (LAr) detectors are made at progressively larger sizes, accurate models of LAr optical properties become increasingly important for simulating light transport, understanding signals, and developing analyses. The refractive index, group velocity, and Rayleigh scattering length are particularly important for vacuum ultraviolet (VUV) and visible photons in detectors with diameters much greater than one meter. While optical measurements in the VUV are sparse, recent measurements of the group velocity of 128 nm photons in LAr provide valuable constraints on these parameters. These calculations are further complicated by the dependence of optical parameters on thermodynamic properties that might fluctuate or vary throughout the argon volume. This manuscript presents the model used by DEAP-3600, a dark matter direct detection experiment at SNOLAB using a 3.3 tonne LAr scintillation counter. Existing data and thermodynamic models are synthesized to estimate the wavelength-dependent refractive index, group velocity, and Rayleigh scattering length within the detector, and parameters' uncertainties are estimated. This model, along with in situ measurements of LAr scintillation properties, is benchmarked against data collected in DEAP-3600, providing a method for modeling optical properties in large LAr detectors and for propagating their uncertainties through downstream simulations. Updates are also presented of the Noble Element Simulation Technique (NEST) software, widely used to model scintillation and ionization signals in argon- and xenon-based detectors.

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“…DEAP-3600 is located 2 km underground at SNOLAB in Sudbury, Canada. This detector features a target mass of (3269 ± 24) kg of liquid argon (LAr) and stands as the largest of its kind in operation [2]. Cooldown for the third fill of DEAP-3600 will start in summer 2024.…”

Section: Introductionmentioning

confidence: 99%

Study of the energy calibration of the DEAP-3600 detector using Na-22 source data and simulations

Luzzi

2024

J. Inst.

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DEAP-3600 is a single-phase liquid argon (LAr) direct-detection dark matter experiment, operating 2 km underground at SNOLAB (Sudbury, Canada). The detector consists of 3.3 tons of LAr contained in a spherical acrylic vessel. At WIMP mass of 100 GeV, DEAP-3600 has a projected sensitivity of 10-46 cm2 for the spin independent elastic scattering cross section of WIMPs. Radioactive sources have been used for the energy calibration and to test the detector performance. One of the most effective calibration run has been taken with a 22Na source deployed in a tube located around the DEAP-3600 steel shell. The simultaneous emission of three γs by the source provides an excellent tagging for the 22Na decay. The results concerning the energy response of the detector and the agreement between data and Monte Carlo simulations in DEAP-3600 are investigated in this study.

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Precision measurement of the specific activity of $$^{39}$$Ar in atmospheric argon with the DEAP-3600 detector

Cited by 4 publications

References 30 publications

Application of the most frequent value method for $$^{39}$$Ar half-life determination

Application of the most frequent value method for $$^{39}$$Ar half-life determination

The DEAP-3600 liquid argon optical model and NEST updates

Study of the energy calibration of the DEAP-3600 detector using Na-22 source data and simulations

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