XENON Collaboration2023-08-012023-08-012023XENON Collaboration. "Searching for Heavy Dark Matter near the Planck Mass with XENON1T." <i>Physical Review Letters,</i> 130, no. 26 (2023) American Physical Society: https://doi.org/10.1103/PhysRevLett.130.261002.https://hdl.handle.net/1911/115039Multiple viable theoretical models predict heavy dark matter particles with a mass close to the Planck mass, a range relatively unexplored by current experimental measurements. We use 219.4 days of data collected with the XENON1T experiment to conduct a blind search for signals from multiply interacting massive particles (MIMPs). Their unique track signature allows a targeted analysis with only 0.05 expected background events from muons. Following unblinding, we observe no signal candidate events. This Letter places strong constraints on spin-independent interactions of dark matter particles with a mass between 1×1012 and 2×1017 GeV/c2. In addition, we present the first exclusion limits on spin-dependent MIMP-neutron and MIMP-proton cross sections for dark matter particles with masses close to the Planck scale.engExcept where otherwise noted, this work is licensed under a Creative Commons Attribution (CC BY) license.  Permission to reuse, publish, or reproduce the work beyond the terms of the license or beyond the bounds of Fair Use or other exemptions to copyright law must be obtained from the copyright holder.Journal articlePhysRevLett-130-261002https://doi.org/10.1103/PhysRevLett.130.261002