fermion

fer·mi·on

F0082600 (fûr′mē-ŏn′, fĕr′-)n. Any of a class of particles having a spin that is half an odd integer and obeying the exclusion principle, by which no more than one identical particle may occupy the same quantum state. The fermions include the baryons, quarks, and leptons.

[After Enrico Fermi.]

fermion

(ˈfɜːmɪˌɒn) n (Nuclear Physics) any of a group of elementary particles, such as a nucleon, that has half-integral spin and obeys Fermi-Dirac statistics. Compare boson[C20: named after Enrico Fermi; see -on]

fer•mi•on

(ˈfɜr miˌɒn, ˈfɛər-)

n. any elementary particle, as a neutron, proton, or electron, that is subject to the exclusion principle and whose spin is half an odd integer: ½, 3/2, etc. [1945–50; fermi + (mes) on]

Thesaurus

Noun

fermion - any particle that obeys Fermi-Dirac statistics and is subject to the Pauli exclusion principlebaryon, heavy particle - any of the elementary particles having a mass equal to or greater than that of a proton and that participate in strong interactions; a hadron with a baryon number of +1lepton - an elementary particle that participates in weak interactions; has a baryon number of 0subatomic particle, particle - a body having finite mass and internal structure but negligible dimensions

Translations

φερμιόνιοfermiónfermione

fermion

enUK

fermion

(fûr`mēŏn'): see elementary particleselementary particles,
the most basic physical constituents of the universe. Basic Constituents of Matter

Molecules are built up from the atom, which is the basic unit of any chemical element. The atom in turn is made from the proton, neutron, and electron.
..... Click the link for more information. ; exclusion principleexclusion principle,
physical principle enunciated by Wolfgang Pauli in 1925 stating that no two electrons in an atom can occupy the same energy state simultaneously. The energy states, or levels, in an atom are described in the quantum theory by various values of four different
..... Click the link for more information. ; Fermi-Dirac statisticsFermi-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. .

Fermion

a particle with half-integral spin or an elementary excitation of a quantum system consisting of many particles, that is, a quasiparticle with half-integral spin. Fermions include all baryons—such as the proton, the neutron, and hyperons—and all leptons—the electron, the muon, and neutrinos—and the anti-particles of all baryons and leptons, as well as such quasiparticles as conduction electrons and holes in a solid. Bound systems consisting of an odd number of fermions are also fermions; examples of such systems are atomic nuclei with an odd atomic number and atoms with an odd difference between the atomic number and the number of electrons. The Pauli exclusion principle is valid for fermions. Consequently, systems consisting of identical fermions obey Fermi-Dirac statistics.

fermion

[′fer·mē‚än] (quantum mechanics) A particle, such as the electron, proton, or neutron, which obeys the rule that the wave function of several identical particles changes sign when the coordinates of any pair are interchanged; it therefore obeys the Pauli exclusion principle.

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Words related to fermion

noun any particle that obeys Fermi-Dirac statistics and is subject to the Pauli exclusion principle

Related Words