Abstract
The authors present new results from a cryogenic detector instrumented to measure both the phonon and ionization signals in a 60 g Ge disk operated at 30 mK. Significant improvements in the electronics noise, threshold, and energy resolution of the device have been made. The baseline full width at half maximum (FWHM) corresponding to total system noise, is 1.55 keV in the phonon channel and 1.59 keV in the ionization channel. At 60 keV the FWHM is 1.9 keV and 1.7 keV in the phonon and ionization channels, respectively. A discrimination between electron recoils and nuclear recoils at low energy has been demonstrated. >
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