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Definition of "neutron" |
An uncharged elementary particle. Present in all atomic nuclei except the hydrogen nucleus. / An uncharged elementary particle found in the nucleus of every atom except hydrogen. Solitary mobile neutrons traveling at various speeds originate from fission reactions. Slow (thermal) neutrons can in turn readily cause fission in nuclei of "fissile" isotopes, e.g., U 235, Pu 239, U 233, and fast neutrons can cause fission in nuclei of "fertile" isotopes such as U 238, Pu 239. Sometimes atomic nuclei simply capture neutrons. / The neutron is a subatomic particle, symbol n or n0, with no net electric charge and a mass slightly larger than that of a proton. Protons and neutrons, each with mass approximately one atomic mass unit, constitute the nucleus of an atom, and they are collectively referred to as "nucleons". Their properties and interactions are described by nuclear physics. / subatomic particle in the nucleus of an atom and having no electrical charge. |
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