CdWO scintillating bolometer for Double Beta Decay: Light and Heat anticorrelation, light yield and quenching factors
Résumé
We report the performances of a 0.51 kg CdWO scintillating bolometer to be used for future Double Beta Decay Experiments. The simultaneous read-out of the heat and the scintillation light allows to discriminate between different interacting particles aiming at the disentanglement and the reduction of background contribution, key issue for next generation experiments. We will describe the observed anticorrelation between the heat and the light signal and we will show how this feature can be used in order to increase the energy resolution of the bolometer over the entire energy spectrum, improving up to a factor 2.6 on the 2615 keV line of Tl. The detector was tested in a 433 h background measurement that permitted to estimate extremely low internal trace contaminations of Th and U. The light yield of γ/β, α's and neutrons is presented. Furthermore we developed a method in order to correctly evaluate the absolute thermal quenching factor of α-particles in scintillating bolometers.
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PEER_stage2_10.1016%2Fj.astropartphys.2010.06.009.pdf (1.4 Mo)
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