Antineutrinos, the antimatter counterpart of neutrinos, have an almost non-existent mass and charge, and almost never interact with other particles, which makes them particularly difficult to detect. Physicists have been studying neutrinos from reactors for many years, typically using scintillator-based detectors.
Click here for original story, The SNO+ collaboration gathers the first evidence of antineutrinos in a water Cherenkov detector
Source: Phys.org