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., et al.. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - 83:7(2023). [10.1140/epjc/s10052-023-11678-6]

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

Cavuoti S.;Fiorillo G.;
2023

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.
2023
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., et al.. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - 83:7(2023). [10.1140/epjc/s10052-023-11678-6]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/935205
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