利用地表NOvA探测器基于时序的磁单极子搜寻
Timing-Based Search for Magnetic Monopoles with the NOvA Detector on the Surface
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中文总结 AI 辅助
NOvA实验利用地表远探测器,在2743个活日曝光数据中搜寻特定参数范围的磁单极子,未发现符合事例,给出通量上限并填补了低质量区域约束空白。
中文摘要 AI 辅助
我们报告了对宇宙射线通量中磁单极子成分的搜寻,该分析使用了NOvA实验远探测器2743个活日的曝光数据,NOvA远探测器是一个14千吨的分段液体闪烁体探测器,主要用于观测GeV量级的电子中微子。未观测到与磁单极子相符的事例,在90%置信水平下,针对磁单极子速度6×10⁻⁴ < β < 5×10⁻³且质量大于10⁹ GeV的情况,设定了通量上限为8×10⁻¹⁶ cm⁻²s⁻¹sr⁻¹。由于NOvA的覆盖层仅为3米水当量,该约束覆盖了此前未被探索的低质量区域。
英文摘要
We report a search for a magnetic monopole component of the cosmic-ray flux in a 2743-live-day exposure of the NOvA experiment's Far Detector, a 14 kt segmented liquid scintillator detector designed primarily to observe GeV-scale electron neutrinos. No events consistent with monopoles were observed, setting an upper limit on the flux of $8\times 10^{-16}~\mathrm{cm^{-2}s^{-1}sr^{-1}}$ at 90% C.L. for monopole speed $6\times 10^{-4} < β< 5\times 10^{-3}$ and mass greater than $10^{9}$ GeV. Because of NOvA's small overburden of 3 meters-water equivalent, this constraint covers a previously unexplored low-mass region.