First Results from the DEAP-3600 Dark Matter Search with Argon at SNOLAB
First Results from the DEAP-3600 Dark Matter Search with Argon at SNOLAB
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DOI：
10.1103/physrevlett.121.071801
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发表时间：
2018-08-17
影响因子：
8.6
通讯作者：
Zielinski, J.
中科院分区：
文献类型：
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作者：
Amaudruz, P. -A.;Baldwin, M.;Zielinski, J.
这封信报告了用DEAP-3600单相液氩（LAr）探测器直接搜索暗物质的第一个结果。实验在SNOLAB（Sudbury，Canada）地下2公里处进行，使用大靶质量，LAr靶包含在3600 kg容量的球形丙烯酸容器中。LAr由一组光电倍增管观察，这将记录由暗物质粒子散射引起的罕见核反冲信号产生的闪烁光。对初始填充阶段4.44个工作日（基准曝光量为9.87吨/天）的数据进行分析，证明在氩气中使用脉冲形状辨别的最佳电子反冲抑制，泄漏< 1.2 x 10（-7）（90% C.L.）15 - 31 keV（ee）。没有观察到候选信号事件，这导致氩的弱相互作用大质量粒子（WIMP）-核子自旋无关截面的领先极限，
This Letter reports the first results of a direct dark matter search with the DEAP-3600 single-phase liquid argon (LAr) detector. The experiment was performed 2 km underground at SNOLAB (Sudbury, Canada) utilizing a large target mass, with the LAr target contained in a spherical acrylic vessel of 3600 kg capacity. The LAr is viewed by an array of PMTs, which would register scintillation light produced by rare nuclear recoil signals induced by dark matter particle scattering. An analysis of 4.44 live days (fiducial exposure of 9.87 ton day) of data taken during the initial filling phase demonstrates the best electronic recoil rejection using pulse-shape discrimination in argon, with leakage < 1.2 x 10(-7) (90% C.L.) between 15 and 31 keV(ee). No candidate signal events are observed, which results in the leading limit on weakly interacting massive particle (WIMP)-nucleon spin-independent cross section on argon,