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- Title
Precision measurement of the specific activity of 39Ar in atmospheric argon with the DEAP-3600 detector.
- Authors
Adhikari, P.; Ajaj, R.; Alpízar-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.
- Abstract
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.
- Subjects
LIQUID argon; ARGON; DETECTORS; DARK matter; CONSTRUCTION materials; NEUTRINO detectors
- Publication
European Physical Journal C -- Particles & Fields, 2023, Vol 83, Issue 7, p1
- ISSN
1434-6044
- Publication type
Article
- DOI
10.1140/epjc/s10052-023-11678-6