1.3kg bolometers to search for rare events

Authors :: Arnaboldi, C.
Brofferio, C.
Bucci, C.
Gorla, P.
Pessina, G.
Pirro, S.
Source :: Nuclear Instruments & Methods in Physics Research Section A. Dec2005, Vol. 554 Issue 1-3, p300-305. 6p.
Publication Year :: 2005
Abstract: Abstract: Two crystal bolometers of 1.3kg each, the largest single crystals ever operated with this technique, have been successfully realized and tested below 10mK, in a dilution refrigerator located deep underground in the Gran Sasso National Laboratories. The calibration spectrum, obtained using an external 232Th -ray source, shows an energy resolution of 3–4keV FWHM from 0.5 to 2.6MeV, for both detectors. In the region, a 4.3keV FWHM resolution has been observed on the 5407keV peak due to the decay of 210Po, a natural contaminant of crystals. [Copyright &y& Elsevier]