Abstract
Tests are reported on low temperature calorimetric particle detectors consisting of Si and LiF crystals of mass 1–32 g fitted with commercial Ge temperature sensors, operating in the temperature range 50–70 mK. The objective was to demonstrate energy thresholds in the 1–10 keV range for dark matter detection. Using the energy spectra from 57Co and 137Cs photon sources for calibration, the measured RMS energy sensitivities were 1.5 keV in 1 g Si, 2.5 keV in 4 g Si, 4 keV in 8 g LiF, and 12 keV in 32 g LiF. Spectra were also observed for the photon and cosmic ray muon background, and for thermal neutron reactions in LiF. In all cases, observed energy spectra and absolute event rates were in agreement with Monte Carlo estimates, showing that the whole crystal volume was uniformly sensitive. Energy calibration and operating conditions remained stable with time and thermal cycling.
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