A silicon remoTES cryogenic calorimeter with an Al/Au phonon collector reaches a baseline energy resolution of (21.5 ± 0.3) eV, the best reported for this detector design.
COSINUS -- a model-independent challenge of the DAMA/LIBRA dark matter claim with cryogenic NaI detectors operated in a new low-background facility
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abstract
Low-temperature detectors are a powerful technology for dark matter search, offering excellent energy resolution and low energy thresholds. COSINUS is the only experiment that combines scintillating sodium iodide (NaI) crystals with an additional phonon readout at cryogenic temperatures, using superconducting sensors (remoTES), alongside the conventional scintillation light signal. Via the simultaneous phonon and scintillation light detection, a unique event-by-event particle identification is enabled. This dual-channel approach allows for a model-independent cross-check of the long-standing DAMA/LIBRA signal with a moderate exposure of a few hundred kg d, while completely avoiding key systematic uncertainties inherent to scintillation-only NaI-based searches. COSINUS built and commissioned a dedicated low-background cryogenic facility at the LNGS underground laboratories. Data taking with eight NaI detector modules (COSINUS1$\pi$ Run1) is planned to begin in late 2025.
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Optimization studies of silicon remoTES cryogenic calorimeters
A silicon remoTES cryogenic calorimeter with an Al/Au phonon collector reaches a baseline energy resolution of (21.5 ± 0.3) eV, the best reported for this detector design.