标题： CaWO4晶体在低温下的闪烁特性用于稀有事件搜索 显示英文标题

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

摘要： 鉴于其在低温稀有事件搜索中的应用，我们研究了CaWO4晶体在3.4 K下的低温闪烁特性，分别在{\alpha }和{\gamma }激发条件下进行。 关于闪烁衰减时间，我们在毫秒范围内观察到一个长成分，该成分在40K以下显著贡献于光产率。 我们首次测量了光产率的{\alpha }/{\gamma }比例随温度的变化情况。 该参数可用于闪烁热电堆中区分{\alpha }和{\gamma }事件，结果发现与室温相比，在低温下该参数大约小8-15%。 显示英文摘要

摘要： 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.