The low energy spectrum of TeO2 bolometers: results and perspectives for the CUORE-0 and CUORE experiments

The low energy spectrum of TeO2 bolometers: results and perspectives for the CUORE-0 and CUORE experiments JCAP01(2013)038

We collected 19.4 days of data from four 750 g TeO2 bolometers, and in three of
them we were able to set the energy threshold around 3 keV using a new analysis technique.
We found a background rate ranging from 25 cpd/keV/kg at 3 keV to 2 cpd/keV/kg at 25 keV,
and a peak at 4.7 keV. The origin of this peak is presently unknown, but its presence is
confirmed by a reanalysis of 62.7 kg·days of data from the finished CUORICINO experiment.
Finally, we report the expected sensitivities of the CUORE-0 (52 bolometers) and CUORE
(988 bolometers) experiments to a WIMP annual modulation signal.