论文标题
通过Migdal效应与Darkside-50搜索暗物质 - 核子互动
Search for dark matter-nucleon interactions via Migdal effect with DarkSide-50
论文作者
论文摘要
暗物质弹性散射核可以通过所谓的Migdal效应导致后退原子的激发和电离。电离电子的能量沉积增加了后退核系统沉积的能量,并允许检测子gev/c $^2 $质量暗物质的相互作用。我们使用双相液体氩气预测室进行了针对Sub-Gev/c $^2 $暗物质的新约束,Darkside-50实验的实验(12306 $ \ pm $ 184)kg d。该分析仅基于电离信号,并显着提高了Darkside-50的灵敏度,从而使对暗物质的敏感性降低到40 MeV/c $^2 $。此外,它设定了旋转独立暗物质核截面最严格的上限,质量低于$ 3.6 $ gev/c $^2 $。
Dark matter elastic scattering off nuclei can result in the excitation and ionization of the recoiling atom through the so-called Migdal effect. The energy deposition from the ionization electron adds to the energy deposited by the recoiling nuclear system and allows for the detection of interactions of sub-GeV/c$^2$ mass dark matter. We present new constraints for sub-GeV/c$^2$ dark matter using the dual-phase liquid argon time projection chamber of the DarkSide-50 experiment with an exposure of (12306 $\pm$ 184) kg d. The analysis is based on the ionization signal alone and significantly enhances the sensitivity of DarkSide-50, enabling sensitivity to dark matter with masses down to 40 MeV/c$^2$. Furthermore, it sets the most stringent upper limit on the spin independent dark matter nucleon cross section for masses below $3.6$ GeV/c$^2$.