Results on Low-Mass Weakly Interacting Massive Particles from an 11 kg d Target Exposure of DAMIC at SNOLAB
Results on Low-Mass Weakly Interacting Massive Particles from an 11 kg d Target Exposure of DAMIC at SNOLAB
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SNOLAB 上 11 kg·d DAMIC 目标暴露的低质量弱相互作用大质量粒子的结果
DOI：
10.1103/physrevlett.125.241803
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发表时间：
2020
影响因子：
8.6
通讯作者：
Gaïor, R.
中科院分区：
文献类型：
--
作者：
Aguilar-Arevalo, A.;Amidei, D.;Baxter, D.;Cancelo, G.;Vergara, B. A. Cervantes;Chavarria, A. E.;D’Olivo, J. C.;Estrada, J.;Favela-Perez, F.;Gaïor, R.
我们对 SNOLAB 地下实验室 DAMIC 实验的 11 kg d 目标暴露中存在的弱相互作用大质量粒子 (WIMP) 提出了限制。 DAMIC CCD 中观察到的具有电子当量能量的电离事件的能谱和空间分布与天然放射性的背景一致。观察到过量的电离事件高于分析阈值。虽然这种低能量过剩的起源需要进一步研究，但我们的数据排除了与自旋无关的 WIMP 核子散射截面，与质量为 7 至 7 的 WIMP 一样低。这些结果是硅靶对 WIMP 存在的最强约束，并且与 2013 年 CDMS 硅实验观察到的过量核反冲事件的任何暗物质解释直接相关。
We present constraints on the existence of weakly interacting massive particles (WIMPs) from an 11 kg d target exposure of the DAMIC experiment at the SNOLAB underground laboratory. The observed energy spectrum and spatial distribution of ionization events with electron-equivalent energiesin the DAMIC CCDs are consistent with backgrounds from natural radioactivity. An excess of ionization events is observed above the analysis threshold of. While the origin of this low-energy excess requires further investigation, our data exclude spin-independent WIMP-nucleon scattering cross sectionsas low asfor WIMPs with massesfrom 7 to. These results are the strongest constraints from a silicon target on the existence of WIMPs withand are directly relevant to any dark matter interpretation of the excess of nuclear-recoil events observed by the CDMS silicon experiment in 2013.