论文标题
固态DM检测器中各向异性电离阈值和方向灵敏度
Anisotropic ionization threshold and directional sensitivity in solid state DM detectors
论文作者
论文摘要
核后坐力的阈值位移能量在很大程度上取决于相对于晶体晶格的后退核的方向。假设相似的依赖性对低能核后坐力的电离阈值有限，我们探讨了电离检测器中可观察到的事件速率所致的方向依赖性的后果。对于低质量暗物质，这种效果会导致事件速率的每日调制。我们讨论如何利用这种效果将DM信号与太阳中微子背景区分开，以及如何使用调制信号的结构来识别DM核苷耦合的类型。
The threshold displacement energy for nuclear recoils depends strongly on the direction of the recoiling nucleus with respect to the crystal lattice. Assuming that similar dependence holds for the ionization threshold for low energy nuclear recoils, we explore the consequences of the resulting directional dependence of the observable event rate in ionization detectors. For low mass dark matter, this effect leads to a daily modulation in the event rate. We discuss how this effect can be utilized to separate the DM signal from the solar neutrino background and how the structure of the modulation signal can be used to identify the type of the DM-nucleon coupling.
