학술논문
Deep-underground dark matter search with a COSINUS detector prototype
Document Type
Working Paper
Author
The COSINUS Collaboration; Angloher, G.; Bharadwaj, M. R.; Dafinei, I.; Di Marco, N.; Einfalt, L.; Ferroni, F.; Fichtinger, S.; Filipponi, A.; Frank, T.; Friedl, M.; Fuss, A.; Ge, Z.; Heikinheimo, M.; Hughes, M. N.; Huitu, K.; Kellermann, M.; Maji, R.; Mancuso, M.; Pagnanini, L.; Petricca, F.; Pirro, S.; Proebst, F.; Profeta, G.; Puiu, A.; Reindl, F.; Schaeffner, K.; Schieck, J.; Schmiedmayer, D.; Schwertner, C.; Shera, K.; Stahlberg, M.; Stendahl, A.; Stukel, M.; Tresca, C.; Wagner, F.; Yue, S.; Zema, V.; Zhu, Y.
Source
Subject
Language
Abstract
Sodium iodide (NaI) based cryogenic scintillating calorimeters using quantum sensors for signal read out have shown promising first results towards a model-independent test of the annually modulating signal detected by the DAMA/LIBRA dark matter experiment. The COSINUS collaboration has previously reported on the first above-ground measurements using a dual channel readout of phonons and light based on transition edge sensors (TESs) that allows for particle discrimination on an event-by-event basis. In this letter, we outline the first underground measurement of a NaI cryogenic calorimeter read out via the novel remoTES scheme. A 3.67 g NaI absorber with an improved silicon light detector design was operated at the Laboratori Nazionali del Gran Sasso, Italy. A significant improvement in the discrimination power of $e^-$/$\gamma$-events to nuclear recoils was observed with a five-fold improvement in the nuclear recoil baseline resolution, achieving $\sigma$ = 441 eV. Furthermore, we present a limit on the spin-independent dark-matter nucleon elastic scattering cross-section achieving a sensitivity of $\mathcal{O}$(pb) with an exposure of only 11.6 g d.
Comment: 11 pages, 14 figures
Comment: 11 pages, 14 figures