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Neutron - Wikipedia Neutron stars, formed from massive collapsing stars, consist of neutrons at the density of atomic nuclei but a total mass more than the Sun Neutron properties and interactions are described by nuclear physics Neutrons are not elementary particles; each is composed of three quarks
Atomic nucleus - Wikipedia The atomic nucleus is the small, dense region consisting of protons and neutrons at the center of an atom, discovered in 1911 by Ernest Rutherford at the University of Manchester based on the 1909 Geiger–Marsden gold foil experiment After the discovery of the neutron in 1932, models for a nucleus composed of protons and neutrons were quickly developed by Dmitri Ivanenko [1] and Werner
Nucleon - Wikipedia Nucleon An atomic nucleus is shown here as a compact bundle of the two types of nucleons, protons (red) and neutrons (blue) In this picture, the protons and neutrons are shown as distinct, which is the conventional view in chemistry, for example
Nuclear reaction - Wikipedia In nuclear physics and nuclear chemistry, a nuclear reaction is a process in which two nuclei, or a nucleus and an external subatomic particle, collide to produce one or more new nuclides Thus, a nuclear reaction must cause a transformation of at least one nuclide to another If a nucleus interacts with another nucleus or particle, they then separate without changing the nature of any nuclide
Neutron radiation - Wikipedia Neutron radiation is a form of ionizing radiation that presents as free neutrons Typical phenomena are nuclear fission or nuclear fusion causing the release of free neutrons, which then react with nuclei of other atoms to form new nuclides —which, in turn, may trigger further neutron radiation
Atom - Wikipedia Atoms are the basic particles of the chemical elements An atom consists of a nucleus of protons and generally neutrons, surrounded by an electromagnetically bound swarm of electrons The chemical elements are distinguished from each other by the number of protons that are in their atoms For example, any atom that contains 11 protons is sodium, and any atom that contains 29 protons is copper
Isotope - Wikipedia A nuclide is a species of an atom with a specific number of protons and neutrons in the nucleus, for example, carbon-13 with 6 protons and 7 neutrons Thus the terms are roughly synonymous, but the nuclide concept (referring to individual nuclear species) emphasizes nuclear properties over chemical properties, whereas the isotope concept (grouping all atoms of each element) emphasizes chemical
Discovery of the neutron - Wikipedia Discovery of the neutron James Chadwick at the 1933 Solvay Conference Chadwick had discovered the neutron the year before while working at Cavendish Laboratory The discovery of the neutron and its properties was central to the extraordinary developments in atomic physics in the first half of the 20th century