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.

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

References in corpus (10)

• A History of Dark Matter
• DarkSide-20k: A 20 Tonne Two-Phase LAr TPC for Direct Dark Matter Detection at LNGS
• WIMP dark matter candidates and searches - current status and future prospects
• DarkSide-50 532-day Dark Matter Search with Low-Radioactivity Argon
• Measurement of Scintillation and Ionization Yield and Scintillation Pulse Shape from Nuclear Recoils in Liquid Argon
• Measurement of the liquid argon energy response to nuclear and electronic recoils
• First measurement of the ionization yield of 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