Two TeO2 crystal bolometers of 1.3 kg each, the largest single crystals ever operated with this technique, have been successfully realized and tested below 10 mK, in a dilution refrigerator located deep underground in the Gran Sasso National Laboratories. The calibration spectrum, obtained using an external 232Th gamma-ray source, shows an energy resolution of 3–4 keV FWHM from 0.5 to 2.6 MeV, for both detectors. In the a region, a 4.3 keV FWHM resolution has been observed on the 5407 keV peak due to the a decay of 210Po, a natural contaminant of TeO2 crystals
Arnaboldi, C., Brofferio, C., Bucci, C., Gorla, P., Pessina, G., Pirro, S. (2005). 1.3kg bolometers to search for rare events. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION A, ACCELERATORS, SPECTROMETERS, DETECTORS AND ASSOCIATED EQUIPMENT, 554(1-3), 300-305 [10.1016/j.nima.2005.07.060].
1.3kg bolometers to search for rare events
ARNABOLDI, CLAUDIO;BROFFERIO, CHIARA;GORLA, PAOLO;Pessina, G;
2005
Abstract
Two TeO2 crystal bolometers of 1.3 kg each, the largest single crystals ever operated with this technique, have been successfully realized and tested below 10 mK, in a dilution refrigerator located deep underground in the Gran Sasso National Laboratories. The calibration spectrum, obtained using an external 232Th gamma-ray source, shows an energy resolution of 3–4 keV FWHM from 0.5 to 2.6 MeV, for both detectors. In the a region, a 4.3 keV FWHM resolution has been observed on the 5407 keV peak due to the a decay of 210Po, a natural contaminant of TeO2 crystals
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