Na-based crystal scintillators for next-generation rare event searches

The growing interest in clarifying the controversial situation in the Dark Matter sector has driven the experimental efforts towards new ways to investigate the long-standing DAMA/LIBRA result. Among them, low-temperature calorimeters based on Na-containing scintillating crystals offer the possibility to clarify the nature of the measured signal via particle identification. Here we report the first preliminary measurement of Na-containing crystals, based on a material different from NaI, i.e. Na 2 Mo 2 O 7 and Na 2 W 2 O 7 , pointing out their performance in terms of energy resolution, light yield, and particle identification.