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Calibration of the liquid argon ionization response to low energy electronic and nuclear recoils with DarkSide-50
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Calibration of the liquid argon ionization response to low energy electronic and nuclear recoils with DarkSide-50
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DarkSide-50 has demonstrated the high potential of dual-phase liquid argon time projection chambers in exploring interactions of WIMPs in the GeV/c$^2$ mass range. The technique, based on the detection of the ionization signal amplified via electroluminescence in the gas phase, allows 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 $\sim$180~eV$_{er}$, exploiting $^{37}$Ar and $^{39}$Ar 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 $\sim$500~eV$_{nr}$, the lowest ever achieved in liquid argon, using \textit{in situ} neutron calibration sources and external datasets from neutron beam experiments.
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Cited by 1 Pith paper
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Sensitivity to low-mass WIMPs with an improved liquid argon ionization response model within the DarkSide programme
An updated Thomas-Imel ionization model for liquid argon, constrained by ReD calibration data, produces new world-leading exclusion limits on 1-3 GeV/c² WIMPs.
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