Certain strongly interacting dark matter candidates could have evaded detection, and much work has been done on constraining their parameter space. Recently, it was shown theoretically that the scattering cross section for $m_χ\gtrsim 1$ GeV pointlike dark matter with a nucleus cannot be significantly larger than the geometric cross section of the nucleus. This realization closes the parameter space for pointlike strongly interacting dark matter. However, strongly interacting dark matter is still theoretically possible for composite particles, with much parameter space open. We set new, wide-ranging limits based on data from a novel detector at the University of Chicago. Backgrounds are greatly suppressed by requiring coincidence detection between two spatially separated liquid-scintillator modules. For dark matter ($v \sim 10^{-3}$c), the time of flight would be $\sim 2~μ{\rm s}$, whereas for cosmic rays, it would be $\sim 2~{\rm ns}$. We outline ways to greatly increase sensitivity at modest costs.
The Arthur B. McDonald Canadian Astroparticle Physics Research Institute, Department of Physics, Engineering Physics, and Astronomy, Queen’s University（阿瑟·B·麦克唐纳加拿大天体粒子物理研究所，女王大学物理、工程物理和天文学系）；Perimeter Institute for Theoretical Physics（理论物理珀蒂默研究所）；Department of Physics and McDonnell Center for the Space Sciences, Washington University（华盛顿大学物理系和麦克唐纳空间科学中心）；The Arthur B. McDonald Canadian Astroparticle Physics Research Institute, Department of Physics McGill University（阿瑟·B·麦克唐纳加拿大天体粒子物理研究所，麦吉尔大学物理系）
Towards the Direct Detection of Composite Ultraheavy Dark Matter in Quantum Sensor Arrays
Rice University（莱斯大学）；Institut de Fìsica d’Altes Energies (IFAE)（高能物理研究所）；The Barcelona Institute of Science and Technology（巴塞罗那科学技术学院）；Stony Brook University（石溪大学）
University of Johannesburg（约翰内斯堡大学）；De La Salle University（德拉萨大学）；Université Clermont Auvergne（克莱蒙奥弗涅大学）；Université Lyon 1（里昂第一大学）；Sorbonne Université（索邦大学）；Miami University（迈阿密大学）；Institut de Física d’Altes Energies (IFAE)（高能物理研究所）
