Characterization of argon recoils at the keV scale with ReD and ReD+

Abstract

The ReD experiment measured the ionization yield Qy of argon for nuclear recoils in the 2-10 keV range using a dual-phase Time Projection Chamber irradiated with neutrons from a Cf-252 fission source. The measurement extends coverage below 7 keV, confirms consistency with previous data above 7 keV, and indicates a higher Qy at lower energies. These results are relevant for argon-based experiments searching for dark matter in the form of low-mass Weakly Interacting Massive Particles, which are very sensitive to the modeling of the detector response in this energy range.

Contribution for the Proceedings of LIght Detection In Noble Elements - LIDINE 2025, accepted for publication on JINST

References in corpus (4)

• Measurement of Scintillation and Ionization Yield and Scintillation Pulse Shape from Nuclear Recoils in Liquid Argon
• Calibration of the liquid argon ionization response to low energy electronic and nuclear recoils with DarkSide-50
• DarkSide-20k sensitivity to light dark matter particles
• Characterization of the ionization response of argon to nuclear recoils at the keV scale with the ReD experiment