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arXiv 1006.3231hep-phastro-ph.CO
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暗物质定向探测率的日变化和年变化

On Diurnal and Annual Variations of Directional Detection Rates of Dark Matter

Abhijit Bandyopadhyay, Debasish Majumdar

摘要:

对弱相互作用大质量粒子(WIMP)作为暗物质的方向敏感直接探测将提供暗物质(DM)的明确的非引力特征。由于地球自转引起的DM信号的日变化是银河系WIMP的重要特征。由于地球自转轴相对于WIMP风向的特定方向,在探测器上观测到的WIMP风的视向可以在一天内发生很大的变化。在这项工作中,我们计算了定向探测率与他们的日常和每年的调制在地球上的暗物质实验考虑的几何和动力学的地球太阳系统的详细特征,以及太阳在银河系的运动。本文还考虑了一种不同于通常的暗物质晕标准晕模型的晕模型,即暗盘模型,并对两种模型的结果进行了比较。我们证明了两种类型的气体探测器,即DRIFT(目标材料CS2)和NEWAGE(目标材料CF4),使用时间投影室技术测量反冲核的方向性的结果。计算了特定探测器的WIMP质量和反冲能对事件率日变化的依赖关系,并探讨了所考虑的探测器的质量和反冲能的敏感范围。

英文摘要:

Direction sensitive direct detection of Weakly Interacting Massive Particles (WIMPs) as dark matter would provide an unambiguous non-gravitational signature of dark matter (DM). The diurnal variation of DM signal due to earth's rotation around its own axis can be a significant signature for galactic WIMPs. Because of particular orientation of earth's axis of rotation with respect to WIMP wind direction, the apparent direction of WIMP wind as observed at a detector can alter widely over a day. In this work we calculate the directional detection rates with their daily and yearly modulations in earth-bound dark matter experiments considering detailed features of the geometry and dynamics of the earth-sun system along with the solar motion in galactic frame. A separate halo model namely the dark disc model other than the usual standard halo model for dark matter halo is also considered and the results for two models are compared. We demonstrate the results for two types of gas detectors namely DRIFT (target material CS2) and NEWAGE (target material CF4) that use Time Projection Chamber techniques for measuring directionality of the recoil nucleus. The WIMP mass and recoil energy dependence of the daily variation of event rates are computed for specific detector and the sensitive ranges of mass and recoil energies for the considered detector are probed.

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