Background Assay and Rejection in DRIFT
Background Assay and Rejection in DRIFT
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DRIFT 中的背景分析和剔除
DOI：
10.1016/j.phpro.2014.12.022
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
L. Yuriev
中科院分区：
文献类型：
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作者：
J. Brack;E. Daw;A. Dorofeev;A. Ezeribe;J. Gauvreau;M. Gold;J. Harton;R. Lafler;R. Lauer;E. Lee;D. Loomba;J. Matthews;E. Miller;A. Monte;A. Murphy;S. Paling;N. Phan;S. Sadler;A. Scarff;D. Snowden;N. Spooner;S. Telfer;D. Walker;Matt Williams;L. Yuriev
DRIFT-IId暗物质探测器是一个m3级的低压TPC，具有对wimp诱导的核反冲的定向灵敏度。它的主要背景是由于中央阴极上的污染引起的α衰变。为了减少这些背景，我们将20 μm的金属线中心阴极替换为0.9 μm的镀铝聚酯薄膜，这种材料对α粒子几乎完全透明。对剩余背景的性质和起源进行了详细的建模，从而对中心阴极的α衰变背景进行了原位、pt敏感的分析。这导致了薄膜阴极的进一步改进，导致背景比线阴极减少了2个数量级以上。最后，我们发现在CS2gas中加入o2可以产生多种电负性载流子，这为确定核后坐力的绝对位置和拒绝所有已知的剩余背景提供了一种方法，同时保持了核后坐力检测的高效率。
The DRIFT-IId dark matter detector is a m3-scale low-pressure TPC with directional sensitivity to WIMP-induced nuclear recoils. Its primary backgrounds were due to alpha decays from contamination on the central cathode. Efforts to reduce these backgrounds led to replacing the 20 μm wire central cathode with one constructed from 0.9 μm aluminized mylar, which is almost totally transparent to alpha particles. Detailed modeling of the nature and origin of the remaining backgrounds led to an in-situ, ppt-sensitive assay of alpha decay backgrounds from the central cathode. This led to further improvements in the thin-film cathode resulting in over 2 orders of magnitude reduction in backgrounds compared to the wire cathode. Finally, the addition of O2to CS2gas was found to produce multiple species of electronegative charge carriers, providing a method to determine the absolute position of nuclear recoils and reject all known remaining backgrounds while retaining a high efficiency for nuclear recoil detection.