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fermion |
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fermion (fûr`mēŏn'): see elementary particles elementary particles, the most basic physical constituents of the universe.
Basic Constituents of MatterMolecules are built up from the atom , which is the basic unit of any chemical element . ..... Click the link for more information. ; exclusion principle exclusion principle, physical principle enunciated by Wolfgang Pauli in 1925 stating that no two electrons in an atom can occupy the same energy state simultaneously. ..... Click the link for more information. ; Fermi-Dirac statistics Fermi-Dirac statistics, class of statistics that applies to particles called fermions. Fermions have half-integral values of the quantum mechanical property called spin and are "antisocial" in the sense that two fermions cannot exist in the same state. ..... Click the link for more information. . fermionAny of a group of subatomic particles having odd half-integral spin (¹⁄₂, ³⁄₂). Fermions are named for the Fermi-Dirac statistics that describe their behaviour. They include particles in the class of leptons, baryons, and nuclei of odd mass number (e.g., tritium, helium-3, uranium-233). They obey the Pauli exclusion principle. Fermions are produced and undergo annihilation in particle-antiparticle pairs. See also boson. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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All fermions have spin, a magnetic trait analogous to the spinning of a top. R] mixing matrix, and in exotic fermion models the light-heavy quark mixing angles. Labor in the countryside was supplied by four groups of people--(1) the tenant who owed labor services to the master of the ground; (2) the cottars who were settled on the fermions, each with a cothouse and yard; (3) the unmarried laborers, of then the relatives of tenants and cottars; and (4) a group of skilled workers such as ploughmen, barnmen or threshers, shepherds, sawyers, and limeburners; and some of these needed alternative work out of season. |
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