Measurement of the underground argon radiopurity for Dark Matter direct searches
Measurement of the underground argon radiopurity for Dark Matter direct searches
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测量地下氩放射性纯度以进行暗物质直接搜索
DOI：
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发表时间：
2021
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通讯作者：
V. Pesudo
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作者：
V. Pesudo
全球正在进行一项重大努力，采购 DarkSide-20k (DS-20k) 所需的放射性纯氩，这是新的全球氩暗物质合作的第一个大型探测器。 Urania项目将从美国的二氧化碳井中提取和纯化地下氩（UAr），产量约为330公斤/天。在 DS-20k LAr-TPC 中使用之前，需要对 UAr 进行额外的化学纯化。 Aria 项目将使用位于撒丁岛（意大利）的低温蒸馏塔 (Seruci-I) 纯化 UAr。根据 39Ar 评估 UAr 纯度对于 DarkSide-20k 实验的物理程序至关重要。 DArT 是一个小型（1 升）辐射纯室，可测量 UAr 中的 39 Ar 消耗因子。探测器将浸入 ArDM（LSC，西班牙）的活性液态 Ar 体积中，这将充当探测器材料和周围岩石中伽马射线的否决权。本文回顾了 DarkSide-20k 的 UAr 项目的现状和前景，特别关注 DArT。
A major worldwide effort is underway to procure the radiopure argon needed for DarkSide-20k (DS-20k), the first large scale detector of the new Global Argon Dark Matter Collaboration. The Urania project will extract and purify underground argon (UAr) from CO2 wells in the USA at a production rate of about 330 kg/day. Additional chemical purification of the UAr will be required prior to its use in the DS-20k LAr-TPC. The Aria project will purify UAr using a cryogenic distillation column (Seruci-I), located in Sardinia (Italy). Assessing the UAr purity in terms of 39Ar is crucial for the physics program of the DarkSide-20k experiment. DArT is a small (1 litre) radiopure chamber that will measure the 39 Ar depletion factor in the UAr. The detector will be immersed in the active liquid Ar volume of ArDM (LSC, Spain), which will act as a veto for gammas from the detector materials and the surrounding rock. In this article, the status and prospects of the UAr projects for DarkSide-20k are reviewed with a special focus in DArT.