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

Adhikari, P.; Ajaj, R.; Alpizar-Venegas, M.; Amaudruz, P. -A.; Anstey, J.; Araujo, G. R.; Auty, D. J.; Baldwin, M.; Batygov, M.; Beltran, B.; Benmansour, H.; Bina, C. E.; Bonatt, J.; Bonivento, W.; Boulay, M. G.; Broerman, B.; Bueno, J. F.; Burghardt, P. M.; Butcher, A.; Cadeddu, M.; Cai, B.; Cardenas-Montes, M.; Cavuoti, S.; Chen, M.; Chen, Y.; Choudhary, S.; Cleveland, B. T.; Corning, J. M.; Crampton, R.; Cranshaw, D.; Daugherty, S.; Delgobbo, P.; Dering, K.; Stefano, P. D.; Digioseffo, J.; Dolganov, G.; Doria, L.; Duncan, F. A.; Dunford, M.; Ellingwood, E.; Erlandson, A.; Farahani, S. S.; Fatemighomi, N.; Fiorillo, G.; Florian, S.; Flower, A.; Ford, R. J.; Gagnon, R.; Gallacher, D.; Abia, P. G.; Garg, S.; Giampa, P.; Gimenez-Alcazar, A.; Goeldi, D.; Golovko, V. V.; Gorel, P.; Graham, K.; Grant, D. R.; Grobov, A.; Hallin, A. L.; Hamstra, M.; Harvey, P. J.; Haskins, S.; Hearns, C.; Hu, J.; Hucker, J.; Hugues, T.; Ilyasov, A.; Jigmeddorj, B.; Jillings, C. J.; Joy, A.; Kamaev, O.; Kaur, G.; Kemp, A.; Kuzniak, M.; Zia, F. L.; Lai, M.; Langrock, S.; Lehnert, B.; Leonhardt, A.; LePage-Bourbonnais, J.; Levashko, N.; Lidgard, J.; Lindner, T.; Lissia, M.; Lock, J.; Luzzi, L.; Machulin, I.; Majewski, P.; Maru, A.; Mason, J.; Mcdonald, A. B.; Mcelroy, T.; Mcginn, T.; Mclaughlin, J. B.; Mehdiyev, R.; Mielnichuk, C.; Mirasola, L.; Monroe, J.; Nadeau, P.; Nantais, C.; Ng, C.; Noble, A. J.; O'Dwyer, E.; Oliviero, G.; Ouellet, C.; Pal, S.; Papi, D.; Pasuthip, P.; Peeters, S. J. M.; Perry, M.; Pesudo, V.; Picciau, E.; Piro, M. -C.; Pollmann, T. R.; Rad, F.; Rand, E. T.; Rethmeier, C.; Retiere, F.; Rodriguez Garcia, I.; Roszkowski, L.; Ruhland, J. B.; Santorelli, R.; Schuckman II, F. G.; Seeburn, N.; Seth, S.; Shalamova, V.; Singhrao, K.; Skensved, P.; Smith, N. J. T.; Smith, B.; Sobotkiewich, K.; Sonley, T.; Sosiak, J.; Soukup, J.; Stainforth, R.; Stone, C.; Strickland, V.; Stringer, M.; Sur, B.; Tang, J.; Vazquez-Jauregui, E.; Veloce, L.; Viel, S.; Vyas, B.; Walczak, M.; Walding, J.; Ward, M.; Westerdale, S.; Willis, J.; Zuniga-Reyes, A.

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

The specific activity of the β decay of 39 Ar in atmospheric argon is measured using the DEAP-3600 detector. DEAP-3600, located 2 km underground at SNOLAB, uses a total of (3269 ± 24) kg of liquid argon distilled from the atmosphere to search for dark matter. This detector is well-suited to measure the decay of 39 Ar owing to its very low background levels. This is achieved in two ways: it uses low background construction materials; and it uses pulse-shape discrimination to differentiate between nuclear recoils and electron recoils. With 167 live-days of data, the measured specific activity at the time of atmospheric extraction is (0.964 ± 0.001 stat ± 0.024 sys) Bq/kg atmAr , which is consistent with results from other experiments. A cross-check analysis using different event selection criteria and a different statistical method confirms the result.

Precision measurement of the specific activity of 39 Ar in atmospheric argon with the DEAP-3600 detector / Adhikari, P.; Ajaj, R.; Alpizar-Venegas, M.; Amaudruz, P. -A.; Anstey, J.; Araujo, G. R.; Auty, D. J.; Baldwin, M.; Batygov, M.; Beltran, B.; Benmansour, H.; Bina, C. E.; Bonatt, J.; Bonivento, W.; Boulay, M. G.; Broerman, B.; Bueno, J. F.; Burghardt, P. M.; Butcher, A.; Cadeddu, M.; Cai, B.; Cardenas-Montes, M.; Cavuoti, S.; Chen, M.; Chen, Y.; Choudhary, S.; Cleveland, B. T.; Corning, J. M.; Crampton, R.; Cranshaw, D.; Daugherty, S.; Delgobbo, P.; Dering, K.; Stefano, P. D.; Digioseffo, J.; Dolganov, G.; Doria, L.; Duncan, F. A.; Dunford, M.; Ellingwood, E.; Erlandson, A.; Farahani, S. S.; Fatemighomi, N.; Fiorillo, G.; Florian, S.; Flower, A.; Ford, R. J.; Gagnon, R.; Gallacher, D.; Abia, P. G.; Garg, S.; Giampa, P.; Gimenez-Alcazar, A.; Goeldi, D.; Golovko, V. V.; Gorel, P.; Graham, K.; Grant, D. R.; Grobov, A.; Hallin, A. L.; Hamstra, M.; Harvey, P. J.; Haskins, S.; Hearns, C.; Hu, J.; Hucker, J.; Hugues, T.; Ilyasov, A.; Jigmeddorj, B.; Jillings, C. J.; Joy, A.; Kamaev, O.; Kaur, G.; Kemp, A.; Kuzniak, M.; Zia, F. L.; Lai, M.; Langrock, S.; Lehnert, B.; Leonhardt, A.; LePage-Bourbonnais, J.; Levashko, N.; Lidgard, J.; Lindner, T.; Lissia, M.; Lock, J.; Luzzi, L.; Machulin, I.; Majewski, P.; Maru, A.; Mason, J.; Mcdonald, A. B.; Mcelroy, T.; Mcginn, T.; Mclaughlin, J. B.; Mehdiyev, R.; Mielnichuk, C.; Mirasola, L.; Monroe, J.; Nadeau, P.; Nantais, C.; Ng, C.; Noble, A. J.; O'Dwyer, E.; Oliviero, G.; Ouellet, C.; Pal, S.; Papi, D.; Pasuthip, P.; Peeters, S. J. M.; Perry, M.; Pesudo, V.; Picciau, E.; Piro, M. -C.; Pollmann, T. R.; Rad, F.; Rand, E. T.; Rethmeier, C.; Retiere, F.; Rodriguez Garcia, I.; Roszkowski, L.; Ruhland, J. B.; Santorelli, R.; Schuckman II, F. G.; Seeburn, N.; Seth, S.; Shalamova, V.; Singhrao, K.; Skensved, P.; Smith, N. J. T.; Smith, B.; Sobotkiewich, K.; Sonley, T.; Sosiak, J.; Soukup, J.; Stainforth, R.; Stone, C.; Strickland, V.; Stringer, M.; Sur, B.; Tang, J.; Vazquez-Jauregui, E.; Veloce, L.; Viel, S.; Vyas, B.; Walczak, M.; Walding, J.; Ward, M.; Westerdale, S.; Willis, J.; Zuniga-Reyes, A.. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - 83:7(2023). [10.1140/epjc/s10052-023-11678-6]