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

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arxiv 1510.05787 v1 pith:BCANKEWG submitted 2015-10-20 physics.ins-det astro-ph.IM

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

M. v. Sivers , M. Clark , P.C.F. Di Stefano , A. Erb , A. G\"utlein , J.-C. Lanfranchi , A. M\"unster , P. Nadeau
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M. Piquemal W. Potzel S. Roth K. Schreiner R. Strauss S. Wawoczny M. Willers A. Z\"oller
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classification physics.ins-det astro-ph.IM
keywords alphagammascintillationcawo4crystalslightlow-temperatureproperties
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In prospect of its application in cryogenic rare-event searches, we have investigated the low-temperature scintillation properties of CaWO4 crystals down to 3.4 K under {\alpha} and {\gamma} excitation. Concerning the scintillation decay times, we observe a long component in the ms range which significantly contributes to the light yield below 40K. For the first time we have measured the temperature dependence of the {\alpha}/{\gamma}- ratio of the light yield. This parameter which can be used to discriminate {\alpha} and {\gamma} events in scintillating bolometers is found to be about 8-15% smaller at low temperatures compared to room temperature.

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