fermion


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Related to fermion: boson, quark

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.
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; 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
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; 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.
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.

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.
References in periodicals archive ?
TWO'S A CROWD Despite its endless variety, matter actually contains only two kinds of building blocks: bosons and fermions.
It is well known that graphene junction have finite dimensions [14,15], the motion of chiral fermions is quantized.
Now, according to the equation (8) the neutrino fermion mass is found:
Physicists will be able to study the properties of the material-bound particles to explore the possibility that free-floating varieties of Weyl fermions exist.
Washington, June 23 ( ANI ): Scientists have discovered evidence for the first time, which suggests direct decay of Higgs boson into fermions.
Statistics which is based on fermions is called Fermi-Dirac' statistics.
We call the two sets in the bipartition of V(A) bosons and fermions, though the actual choice is mostly arbitrary and we do not consider it part of the data.
The strangeness is enlarged by the way Fermion thinks.
Using properties in a crystal composed of uranium, ruthenium and silicon the effects of heavy fermions began to appear as the material was cooled below 55 Kelvin (-218 [degrees]C).
The scientists used molecular beam epitaxy to grow artificial superlattices of the antiferromagnetic heavy fermion compound [CeIn.
With Colm O'Donoghue stepping in for Fallon, Astronomer Royal (4-7) hacked up in the maiden, despite veering to the far side close home, before Fermion caused a 14-1 shock in the Chalice Stakes.
That Listed event went the way of Fermion who overhauled Reunite (4-6).