Day Francesca, Fairbairn Malcolm
1DAMTP, CMS, University of Cambridge, Wilberforce Road, Cambridge, CB3 0WA UK.
2Department of Physics, King's College London, Strand, London, WC2R 2LS UK.
Eur Phys J C Part Fields. 2018;78(6):512. doi: 10.1140/epjc/s10052-018-5994-7. Epub 2018 Jun 20.
Fluorescent dark matter has been suggested as a possible explanation of both the 3.5 keV excess in the diffuse emission of the Perseus Cluster and of the deficit at the same energy in the central active galaxy within that cluster, NGC 1275. In this work we point out that such a dark matter candidate can be searched for at the new X-ray laser facilities that are currently being built and starting to operate around the world. We present one possible experimental set up where the laser is passed through a narrow cylinder lined with lead shielding. Fluorescent dark matter would be excited upon interaction with the laser photons and travel across the lead shielding to decay outside the cylinder, in a region which has been instrumented with X-ray detectors. For an instrumented length of 7 cm at the LCLS-II laser we expect (1-10) such events per week for parameters which explain the astronomical observations.
荧光暗物质被认为是对英仙座星系团弥漫发射中3.5keV过剩以及该星系团中心活动星系NGC 1275中相同能量处亏损的一种可能解释。在这项工作中，我们指出可以在目前正在世界各地建造并开始运行的新型X射线激光设施中寻找这种暗物质候选体。我们提出了一种可能的实验装置，其中激光穿过一个内衬铅屏蔽的狭窄圆柱体。荧光暗物质与激光光子相互作用时会被激发，并穿过铅屏蔽在圆柱体外衰变，该区域已配备X射线探测器。对于LCLS-II激光7厘米的探测长度，对于能解释天文观测的参数，我们预计每周会有(1 - 10)次这样的事件。
