Antineutron
The antineutron is the antiparticle of the neutron. It has the same mass as a neutron but opposite baryon number (+1 becomes -1) and electric charge (0 remains 0). Discovered in 1956, it consists of an anti-up quark, an anti-down quark, and another anti-up quark bound together by the strong force. It quickly annihilates upon interaction with matter, producing high-energy photons and other particles.
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