碳纳米管阵列中的WIMP检测和慢离子动力学
WIMP detection and slow ion dynamics in carbon nanotube arrays
摘要：
一端开口的碳纳米管阵列可以作为定向探测弱相互作用暗物质粒子的目标材料。作为CNT上的WIMP弹性散射的结果，碳离子可能被注入阵列的主体中并且通过晶格内的多次碰撞传播。离子最终可以从具有开口端CNT的表面出现，只要其纵向动量足够大以补偿能量损失并且其横向动量接近单个CNT中的沟道条件。因此，必须适当地选择WIMP风的表观取向与平行碳纳米管轴向之间形成的角度。我们专注于非常低的离子反冲动能，与低质量WIMP（~ 10 GeV），其中大多数现有的实验具有低灵敏度。基于二维圆形障碍物晶格的一些精确结果，我们研究了低能离子在横向平面内相对于CNT方向的运动。新的约束条件是如何设计的CNT阵列，以最大限度地提高检测效率。
英文摘要：
Large arrays of aligned carbon nanotubes (CNTs), open at one end, could be used as target material for the directional detection of weakly interacting dark matter particles (WIMPs). As a result of a WIMP elastic scattering on a CNT, a carbon ion might be injected in the body of the array and propagate through multiple collisions within the lattice. The ion may eventually emerge from the surface with open end CNTs, provided that its longitudinal momentum is large enough to compensate energy losses and its transverse momentum approaches the channeling conditions in a single CNT. Therefore, the angle formed between the WIMP wind apparent orientation and the direction of parallel carbon nanotube axes must be properly chosen. We focus on very low ion recoil kinetic energies, related to low mass WIMPs (~ 10 GeV) where most of the existing experiments have low sensitivity. Relying on some exact results on two-dimensional lattices of circular obstacles, we study the low energy ion motion in the transverse plane with respect to CNT directions. New constraints are obtained on how to devise the CNT arrays to maximize the detection efficiency.
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