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

Autor:	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.
Předmět:	LIQUID argon ARGON DETECTORS DARK matter CONSTRUCTION materials NEUTRINO detectors
Zdroj:	European Physical Journal C -- Particles & Fields; Jul2023, Vol. 83 Issue 7, p1-10, 10p
Abstrakt:	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. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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