Scientific American
Neutron Veto: Among the upgrades the XENON experiment will have during its new run is a system to catch free neutrons, which can create signals similar to those caused by dark matter. Neutrons might occasionally be released by the stainless steel in the water tank surrounding the detector or by cosmic rays coming from space, causing a false detection. The octagonal neutron veto cage, studded with the backs of photomultiplier tubes that will detect any neutrons present, sits inside the water tank. Credit: Enrico Sacchetti
Dark Matter’s Last Stand
A new experiment could catch invisible particles that previous detectors have not