PICO-60 C $_3$ F $_8$泡室完全曝光的暗物质搜索结果
Dark Matter Search Results from the Complete Exposure of the PICO-60 C$_3$F$_8$ Bubble Chamber
摘要：
最后的结果报告的PICO-60 C $_3$ F $_8$暗物质探测器，一个泡室充满了52公斤的C $_3$ F $_8$位于SNOLAB地下实验室的操作。该室在低至1.2 keV的热力学阈值下操作，而不损失稳定性。在2.45 keV阈值下获得了新的盲态1404 kg-天暴露量，预期总背景速率与之前在3.3 keV下的1167 kg-天暴露量大致相同。这种增加的曝光部分是通过新的光学跟踪分析来实现的，以更好地识别探测器壁附近的事件，从而允许更大的基准体积。这些结果设置了最严格的直接检测约束的日期在2.5 $\times$ 10 $^{-41}$ cm $^2$的25 GeV的WIMP质子自旋相关的横截面，并改善了以前的PICO结果为3-5 GeV的WIMP的数量级。
英文摘要：
Final results are reported from operation of the PICO-60 C$_3$F$_8$ dark matter detector, a bubble chamber filled with 52 kg of C$_3$F$_8$ located in the SNOLAB underground laboratory. The chamber was operated at thermodynamic thresholds as low as 1.2 keV without loss of stability. A new blind 1404-kg-day exposure at 2.45 keV threshold was acquired with approximately the same expected total background rate as the previous 1167-kg-day exposure at 3.3 keV. This increased exposure is enabled in part by a new optical tracking analysis to better identify events near detector walls, permitting a larger fiducial volume. These results set the most stringent direct-detection constraint to date on the WIMP-proton spin-dependent cross section at 2.5 $\times$ 10$^{-41}$ cm$^2$ for a 25 GeV WIMP, and improve on previous PICO results for 3-5 GeV WIMPs by an order of magnitude.
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