在地表场地使用核乳胶探测器进行首次方向敏感的暗物质搜索
First direction sensitive search for dark matter with a nuclear emulsion detector at a surface site
AI总结：
首次在地表无屏蔽环境下使用核乳胶探测器进行方向敏感暗物质搜索，通过赤道望远镜消除地球自转效应，曝光39天后数据与背景模型一致，并在暗物质质量-截面平面上得出排除限。
摘要：
细颗粒核乳胶薄膜已被开发为具有纳米级空间分辨率的径迹探测器，得益于能够利用这一前所未有的分辨率的新型读出技术，可用于方向敏感的暗物质搜索。乳胶探测器对时间不敏感。因此，使用此类探测器进行方向性暗物质搜索需要使用赤道望远镜来吸收地球自转效应。我们首次在无屏蔽的海平面位置进行了方向性暗物质搜索，方法是将乳胶探测器安装在赤道望远镜支架上曝光39天。在等效于0.59 g days曝光期间收集的数据的观测角分布与背景模型一致，随后在暗物质质量和截面平面上得出了排除图：对于10 GeV/c²和100 GeV/c²的暗物质质量，分别排除了高于1.3×10⁻²⁸ cm²和1.7×10⁻³¹ cm²的截面。这是首次使用固态粒子径迹探测器进行方向敏感的暗物质搜索。
英文摘要：
Fine-grained nuclear emulsion films have been developed as a tracking detector with nanometric spatial resolution to be used in direction-sensitive dark matter searches, thanks to novel readout technologies capable of exploiting this unprecedented resolution. Emulsion detectors are time insensitive. Therefore, a directional dark matter search with such detector requires the use of an equatorial telescope to absorb the Earth rotation effect. We have conducted for the first time a directional dark matter search in an unshielded location, at the sea level, by keeping an emulsion detector exposed for 39 days on an equatorial telescope mount. The observed angular distribution of the data collected during an exposure equivalent to 0.59 g days agrees with the background model and an exclusion plot was then derived in the dark matter mass and cross-section plane: cross-sections higher than $1.3 \times 10^{-28}$ cm$^{2}$ and $1.7 \times 10^{-31}$ cm$^2$ were excluded for a dark matter mass of $10$ GeV$/c^2$ and $100$ GeV$/c^2$, respectively. This is the first direction sensitive search for dark matter with a solid-state, particle tracking detector.
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