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.
@article{arxiv.2602.14538,
title = {Characterization of argon recoils at the keV scale with ReD and ReD+},
author = {L. Pandola and P. Agnes and I. Ahmad and S. Albergo and I. Albuquerque and M. Atzori Corona and M. Ave and B. Bottino and M. Cadeddu and A. Caminata and N. Canci and M. Caravati and L. Consiglio and S. Davini and M. De Napoli and L. K. S. Dias and G. Dolganov and G. Fiorillo and D. Franco and M. Gulino and T. Hessel and N. Kemmerich and M. Kimura and M. Kuźniak and M. La Commara and J. Machts and G. Matteucci and E. Moura Santos and E. Nikoloudaki and V. Oleynikov and R. Perez Varona and N. Pino and S. M. R. Puglia and M. Rescigno and D. Sablone and B. Sales Costa and S. Sanfilippo and C. Sunny and Y. Suvorov and R. Tartaglia and G. Testera and A. Tricomi and M. Wada and Y. Wang and R. Wojaczyński and P. Zakhary},
journal= {arXiv preprint arXiv:2602.14538},
year = {2026}
}
Comments
Contribution for the Proceedings of LIght Detection In Noble Elements - LIDINE 2025, accepted for publication on JINST