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fermion |
Also found in: Wikipedia, Hutchinson | 0.09 sec. |
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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. |
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Scientists have long wondered whether superfluidity in a fermionic fluid could persist in the face of a spin imbalance, when there are more fermions with one spin than with the other. session, Deborah Jin of JILA/University of Colorado will talk about fermionic condensates, ultracold gases of matter that are enabling researchers to explore some fundamental physics phenomena such as superconductivity. Regal, and Markus Greiner describe the novel substance, dubbed a fermionic condensate, in the Jan. |
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