PICO-60 C $_3$ F $_8$泡室的暗物质搜索结果
Dark Matter Search Results from the PICO-60 C$_3$F$_8$ Bubble Chamber
摘要：
PICO-60暗物质探测器，一个泡室充满了52公斤的C $_3$ F $_8$位于SNOLAB地下实验室的操作报告的新结果。与以前的PICO气泡室一样，PICO-60 C $_3$ F $_8$具有出色的电子反冲和α衰变抑制能力，观察到的多次散射中子率表明每月的单次散射中子背景小于1次。在3.3千电子伏的热力学阈值下，对效率校正后的1167千克-天曝光量进行盲分析，发现没有单散射核反冲候选物，与预测的背景一致。这些结果设置了最严格的直接检测约束，迄今为止在3.4 $\times$ 10 $^{-41}$厘米$^2$的30 GeV的$\thinspace$ c $^{-2}$ WIMP，一个以上的数量级的改进，从以前的PICO结果的WIMP质子自旋相关的横截面。
英文摘要：
New results are reported from the operation of the PICO-60 dark matter detector, a bubble chamber filled with 52 kg of C$_3$F$_8$ located in the SNOLAB underground laboratory. As in previous PICO bubble chambers, PICO-60 C$_3$F$_8$ exhibits excellent electron recoil and alpha decay rejection, and the observed multiple-scattering neutron rate indicates a single-scatter neutron background of less than 1 event per month. A blind analysis of an efficiency-corrected 1167-kg-day exposure at a 3.3-keV thermodynamic threshold reveals no single-scattering nuclear recoil candidates, consistent with the predicted background. These results set the most stringent direct-detection constraint to date on the WIMP-proton spin-dependent cross section at 3.4 $\times$ 10$^{-41}$ cm$^2$ for a 30-GeV$\thinspace$c$^{-2}$ WIMP, more than one order of magnitude improvement from previous PICO results.
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。
