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arXiv 0902.4430physics.ins-dethep-ex
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与定向暗物质散射有关的气体中核反冲头-尾特征的模拟

Simulations of the Nuclear Recoil Head-Tail Signature in Gases Relevant to Directional Dark Matter Searches

P. Majewski, D. Muna, D. P. Snowden-Ifft, N. J. C. Spooner

摘要:

我们提出了第一个详细的模拟头尾效应相关的定向暗物质搜索。大多数的电离电荷的位置的调查,无论是在开始的一半(尾部)或在结束的一半(头部)的核反冲轨道进行碳和硫反冲在40托负离子二硫化碳和氟反冲在100托四氟化碳。SRIM模拟程序,连同一个专门编写的蒙特卡罗发生器,用于模拟生产的电离对,扩散和基本读出几何相关的潜在的真实探测器的情况下,如正在开发的漂移实验。结果清楚地表明存在的头-尾轨道不对称性,但严重影响的幅度由两个竞争因素:性质的阻止能力和细节的范围离散。前者往往导致尾部大于头部,后者则相反。

英文摘要:

We present the first detailed simulations of the head-tail effect relevant to directional Dark Matter searches. Investigations of the location of the majority of the ionization charge as being either at the beginning half (tail) or at the end half (head) of the nuclear recoil track were performed for carbon and sulphur recoils in 40 Torr negative ion carbon disulfide and for fluorine recoils in 100 Torr carbon tetrafluoride. The SRIM simulation program was used, together with a purpose-written Monte Carlo generator, to model production of ionizing pairs, diffusion and basic readout geometries relevant to potential real detector scenarios, such as under development for the DRIFT experiment. The results clearly indicate the existence of a head-tail track asymmetry but with a magnitude critically influenced by two competing factors: the nature of the stopping power and details of the range straggling. The former tends to result in the tail being greater than the head and the latter the reverse.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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