Low-Temperature Scintillation Properties of CaWO4 Crystals for Rare-Event Searches

摘要

In prospect of its application in cryogenic rare-event searches, we haveinvestigated the low-temperature scintillation properties of CaWO4 crystalsdown to 3.4 K under {\alpha} and {\gamma} excitation. Concerning thescintillation decay times, we observe a long component in the ms range whichsignificantly contributes to the light yield below 40K. For the first time wehave measured the temperature dependence of the {\alpha}/{\gamma}- ratio of thelight yield. This parameter which can be used to discriminate {\alpha} and{\gamma} events in scintillating bolometers is found to be about 8-15% smallerat low temperatures compared to room temperature.