Author/Authors :
Pirro، نويسنده , , S and Alessandrello، نويسنده , , A and Brofferio، نويسنده , , C and Bucci، نويسنده , , C and Cremonesi، نويسنده , , O and Coccia، نويسنده , , E and Fiorini، نويسنده , , E and Fafone، نويسنده , , V and Giuliani، نويسنده , , A and Nucciotti، نويسنده , , A and Pavan، نويسنده , , M and Pessina، نويسنده , , G and Previtali، نويسنده , , E and Vanzini، نويسنده , , M and Zanotti، نويسنده , , L، نويسنده ,
Abstract :
In this paper we present the excellent results obtained by mechanical decoupling of our thermal detectors from the cryostat. The starting point of this work is the necessity to improve the performances of thermal detectors and, besides, to eliminate the non-constant noise resulting from the overall cryogenic facility; this second point results to be crucial for rare-events experiments and the fundamental task for Dark Matter search. Tested on our bolometer, consisting of a 750 g tellurium oxide absorber coupled with an NTD thermistor and operated at ∼9 mK in an Oxford 200 dilution refrigerator, this powerful technique can, moreover, provide advantages for a large variety of thermal detectors. A good energy resolution of 3.9 keV FWHM was obtained for 2.615 MeV γ-rays. The 4.2 keV average FWHM resolution for the 5407 keV 210Po α decay line is the best ever obtained for α-particles with any type of detector.
