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• n  the antiparticle of a neutron

• If an antineutron hits a neutron, both turn into energy.
• The neutron shot out of the picture undetected, but the antineutron hit a carbon atom in the propane and committed double suicide with one of its protons or neutrons.
• It is the antimatter counterpart to the nucleus of deuterium (heavy hydrogen), consists of an antiproton and antineutron bound by a strong nuclear force, and has a negative .