# Calibration of the liquid argon ionization response to low energy electronic and nuclear recoils with DarkSide-50

Abstract : DarkSide-50 has demonstrated the high potential of dual-phase liquid argon time projection chambers in exploring interactions of WIMPs in the $GeV/c2$ mass range. The technique, based on the detection of the ionization signal amplified via electroluminescence in the gas phase, allows us to explore recoil energies down to the sub-keV range. We report here on the DarkSide-50 measurement of the ionization yield of electronic recoils down to $∼180 eVer$, exploiting $Ar37$ and $Ar39$ decays, and extrapolated to a few ionization electrons with the Thomas-Imel box model. Moreover, we present a model-dependent determination of the ionization response to nuclear recoils down to $∼500 eVnr$, the lowest ever achieved in liquid argon, using in situ neutron calibration sources and external datasets from neutron beam experiments.
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https://hal.archives-ouvertes.fr/hal-03372756
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Submitted on : Thursday, October 14, 2021 - 10:52:13 AM
Last modification on : Tuesday, November 30, 2021 - 9:54:05 PM

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P. Agnes, I.F.M. Albuquerque, T. Alexander, A.K. Alton, M. Ave, et al.. Calibration of the liquid argon ionization response to low energy electronic and nuclear recoils with DarkSide-50. Phys.Rev.D, 2021, 104 (8), pp.082005. ⟨10.1103/PhysRevD.104.082005⟩. ⟨hal-03372756⟩

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