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

(DarkSide Collaboration)

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish (US)
Article numberA3
JournalPhysical Review D
Volume104
Issue number8
DOIs
StatePublished - Oct 15 2021

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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