论文标题
News-G实验的最新进展
Recent advancements of the NEWS-G experiment
论文作者
论文摘要
News-G（新的实验球形气体）是一个实验，目的是通过新颖的气态探测器（球形比例计数器）对暗物质的难题进行启示。它使用轻质气体（例如氢，氦气和霓虹灯）作为将暗物质搜索扩展到Sub-Gev/c $^{2} $质量区域的目标。 News-G在LSM（法国）安装了直径60厘米的探测器时产生了第一个结果，不包括90％C.L.横截面高于$ 4.4 \ cdot {10}^{37} $ cm $^{2} $，用于0.5 Gev/c $^{2} $质量的暗物质候选者。目前，在LSM上建造了140厘米的直径探测器，并正在进行调试跑步，然后在年底在加拿大Snolab（加拿大）安装。此处介绍的是该新检测器中纳入的开发项目：a）使用电阻材料和多动物读数的传感器技术，可允许高增益和高压操作； b）消除污染物的气体净化技术（h $ _ {2} $ o，o $ _ {2} $）; c）减少$ {}^{210} $ pb通过铜电构方法引起的背景； d）利用紫外线对检测器校准，检测器响应监测和气体相关基本特性的估计。下一阶段的新闻G将允许以前所未有的灵敏度搜索低质量暗物质。
NEWS-G (New Experiments With Spheres-Gas) is an experiment aiming to shine a light on the dark matter conundrum with a novel gaseous detector, the spherical proportional counter. It uses light gases, such as hydrogen, helium, and neon, as targets to expand dark matter searches to the sub-GeV/c$^{2}$ mass region. NEWS-G produced its first results with a 60 cm in diameter detector installed at LSM (France), excluding at 90% C.L. cross-sections above $4.4\cdot{10}^{37}$ cm$^{2}$ for dark matter candidates of 0.5 GeV/c$^{2}$ mass. Currently, a 140 cm in diameter detector is being built at LSM and a commissioning run is underway, prior to its installation at SNOLAB (Canada) at the end of the year. Presented here are developments incorporated in this new detector: a) sensor technologies using resistive materials and multi-anode read-out that allow high gain and high pressure operation; b) gas purification techniques to remove contaminants (H$_{2}$O, O$_{2}$); c) reduction of ${}^{210}$Pb induced background through copper electroforming methods; d) utilisation of UV-lasers for detector calibration, detector response monitoring and estimation of gas related fundamental properties. This next phase of NEWS-G will allow searches for low mass dark matter with unprecedented sensitivity.
