SMuK 2023 – scientific programme
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T: Fachverband Teilchenphysik
T 67: Neutrinos, Dark Matter VII
T 67.3: Talk
Wednesday, March 22, 2023, 16:20–16:35, HSZ/0002
Quenching Factor measurements with COSINUS NaI crystals — •Mukund Raghunath Bharadwaj for the COSINUS collaboration — Max-Planck-Institut für Physik, Föhringer Ring 6, 80805 München
NaI (Tl) based scintillation detectors have become a staple in the field of direct dark matter searches, with the DAMA-LIBRA experiment being the stand out for its reported dark matter observation which is in direct contrast with numerous other results. In order to accurately calibrate the energies of WIMP induced nuclear recoil signals and conclusively rule out the parameter space covered by DAMA/LIBRA, precise measurements of the quenching factor of the NaI crystals is essential for each of these experiments as it is well established that electron recoils and nuclear recoils have dis-similar scintillation light yields. In this study, we present first preliminary results of a systematic study that has been carried out by the COSINUS collaboration to measure the quenching factor values primarily in the low recoil energies of 1-30keVnr in order to better understand the discrepancies/uncertainities reported by various experiments. Five ultra-pure NaI crystals manufactured by the Shanghai Institute for Ceramics, each of which have varying Tl dopant concentration, were irradiated with a mono-energetic neutron beam to study its impact on the quenching factor values in the desired recoil energy range.