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neutron British & World English

A subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen

fast neutron British & World English

A neutron with high kinetic energy, especially one released by nuclear fission and not slowed by any moderator

neutron bomb British & World English

A nuclear weapon that produces large numbers of neutrons rather than heat or blast, and is consequently harmful to life but not destructive of property

neutron star British & World English

A celestial object of very small radius (typically 30 km) and very high density, composed predominantly of closely packed neutrons. Neutron stars are thought to form by the gravitational collapse of the remnant of a massive star after a supernova explosion, provided that the star is insufficiently massive to produce a black hole

slow neutron British & World English

A neutron with low kinetic energy especially after moderation

thermal neutron British & World English

A neutron in thermal equilibrium with its surroundings