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antineutron in physics, the antiparticle of a neutron.
baryon in physics, a heavy subatomic particle of half-integral spin, such as a proton, neutron, or hyperon.
chromodynamics in particle physics, the theory of the strong interaction between quarks and gluons, fundamental particles that form hadrons such as the proton and neutron.
control rod a rod or bar in a nuclear reactor that contains a neutron-absorbing material, and that is lowered into or raised from the core to control the fission chain reaction.
deuterium an isotope of hydrogen that has one proton and one neutron in each nucleus; heavy hydrogen. (Cf. protium, tritium.)
deuteron a particle composed of one proton and one neutron that is equivalent to the nucleus of a deuterium atom and that has a positive charge.
nucleon a proton or neutron, esp. as a component of an atomic nucleus.
pulsar any of various astronomical objects, probably rapidly rotating neutron stars, that emit short, repeating pulses of radio waves.