- Strong interaction
Standard model of particle physics
In particle physics, the strong interaction (also called the strong force, strong nuclear force, or color force) is one of the four fundamental interactions of nature, the others being electromagnetism, the weak interaction and gravitation. As with the other fundamental interactions, it is a non-contact force. At atomic scale, it is about 100 times stronger than electromagnetism, which in turn is orders of magnitude stronger than the weak force interaction and gravitation.
The strong interaction is observable in two areas: on a larger scale (about 1 to 3 femtometers), it is the force that binds protons and neutrons together to form the nucleus of an atom. On the smaller scale (less than about 0.8 fm, the radius of a nucleon), it is also the force (carried by gluons) that holds quarks together to form protons, neutrons and other hadron particles.
In the context of binding protons and neutrons (nucleons) together to form atoms, the strong interaction is called the nuclear force (or residual strong force). In this case, it is the residuum of the strong interaction between the quarks that make up the protons and neutrons. As such, the residual strong interaction obeys a quite different distance-dependent behavior between nucleons, from when it is acting to bind quarks within nucleons.
The strong interaction is thought to be mediated by gluons, acting upon quarks, antiquarks, and other gluons. Gluons, in turn, are thought to interact with quarks and gluons because all carry a type of charge called "color charge." Color charge is analogous to electromagnetic charge, but it comes in three types not two, and it results in a different type of force, with different rules of behavior. These rules are detailed in the theory of quantum chromodynamics (QCD), which is the theory of quark-gluon interactions.
Before the 1970s, physicists were uncertain about the binding mechanism of the atomic nucleus. It was known that the nucleus was composed of protons and neutrons and that protons possessed positive electric charge while neutrons were electrically neutral. However, these facts seemed to contradict one another. By physical understanding at that time, positive charges would repel one another and the nucleus should therefore fly apart. However, this was never observed. New physics was needed to explain this phenomenon.
A stronger attractive force was postulated to explain how the atomic nucleus was bound together despite the protons' mutual electromagnetic repulsion. This hypothesized force was called the strong force, which was believed to be a fundamental force that acted on the nucleons (the protons and neutrons that make up the nucleus). Experiments suggested that this force bound protons and neutrons together with equal strength.
It was later discovered that protons and neutrons were not fundamental particles, but were made up of constituent particles called quarks. The strong attraction between nucleons was the side-effect of a more fundamental force that bound the quarks together in the protons and neutrons. The theory of quantum chromodynamics explains that quarks carry what is called a color charge, although it has no relation to visible color. Quarks with unlike color charge attract one another as a result of the strong interaction, which is mediated by particles called gluons.
The word strong is used since the strong interaction is the "strongest" of the four fundamental forces; its strength is 100 times that of the electromagnetic force, some 106 times as great as that of the weak force, and about 1039 times that of gravitation.
The behaviour of the strong force
The contemporary strong force is described by quantum chromodynamics (QCD), a part of the standard model of particle physics. Mathematically, QCD is a non-Abelian gauge theory based on a local (gauge) symmetry group called SU(3).
Quarks and gluons are the only fundamental particles which carry non-vanishing colour charge, and hence participate in strong interactions. The strong force itself acts directly only upon elementary quark and gluon particles.
All quarks and gluons in QCD interact with each other through the strong force. The strength of interaction is parametrized by the strong coupling constant. This strength is modified by the gauge color charge of the particle, a group theoretical property.
The strong force acts between quarks. Unlike all other forces (electromagnetic, weak, and gravitational), the strong force does not diminish in strength with increasing distance. After a limiting distance (about the size of a hadron) has been reached, it remains at a strength of about 10,000 newtons, no matter how much further the distance between the quarks. In QCD this phenomenon is called color confinement; it implies that only hadrons, not individual free quarks, can be observed. The explanation is that the amount of work done against a force of 10,000 newtons (about the weight of a one-metric ton mass on the surface of the Earth) is enough to create particle-antiparticle pairs within a very short distance of an interaction. In simple terms, the very energy applied to pull two quarks apart will turn into new quarks that pair up again with the original ones. The failure of all experiments that have searched for free quarks is considered to be evidence for this phenomenon.
The elementary quark and gluon particles affected are unobservable directly, but instead emerge as jets of newly created hadrons, whenever energy is deposited into a quark-quark bond, as when a quark in a proton is struck by a very fast quark (in an impacting proton) during a particle accelerator experiment. However, quark-gluon plasmas have been observed.
Residual strong force
The residual effect of the strong force is called the nuclear force. The nuclear force acts between hadrons, such as nucleons in atomic nuclei. This "residual strong force", acting indirectly, transmits gluons that form part of the virtual pi and rho mesons, which, in turn, transmit the nuclear force between nucleons.
The residual strong force is thus a minor residuum of the strong force which binds quarks together into protons and neutrons. This same force is much weaker between neutrons and protons, because it is mostly neutralized within them, in the same way that electromagnetic forces between neutral atoms (van der Waals forces) are much weaker than the electromagnetic forces that hold the atoms internally together.
Unlike the strong force itself, the nuclear force, or residual strong force, does diminish in strength, and in fact diminishes strongly with distance. The decrease is approximately as a negative exponential power of distance, though there is no simple expression known for this; see Yukawa potential. This fact, together with the less-rapid decrease of the disruptive electromagnetic force between protons with distance, causes the instability of larger atomic nuclei, such as all those with atomic numbers larger than 82 (Lead).
- Nuclear binding energy
- Color charge
- Coupling constant
- Nuclear physics
- QCD matter
- Quantum field theory and Gauge theory
- Standard model of particle physics and Standard Model (mathematical formulation)
- Weak interaction, electromagnetism and gravity
- Intermolecular force
- ^ R.P. Feynman (1985). QED: The Strange Theory of Light and Matter. Princeton University Press. p. 136. ISBN 0-691-08388-6. "The idiot physicists, unable to come up with any wonderful Greek words anymore, call this type of polarization by the unfortunate name of 'color,' which has nothing to do with color in the normal sense."
- ^ Fritzsch, op. cite, p. 164. The author states that the force between differently colored quarks remains constant at any distance after they travel only a tiny distance from each other, and is equal to that need to raise one ton, which is 1000 kg x 9.8 N = ~ 10,000 N.
- ^ H. Fritzsch (1983). Quarks: The Stuff of Matter. Basic Books. pp. 167–168. ISBN 978-0465067817.
- J.R. Christman (2001). "MISN-0-280: The Strong Interaction". Project PHYSNET. http://126.96.36.199/home/modules/pdf_modules/m280.pdf.
- D.J. Griffiths (1987). Introduction to Elementary Particles. John Wiley & Sons. ISBN 0-471-60386-4.
- F. Halzen, A.D. Martin (1984). Quarks and Leptons: An Introductory Course in Modern Particle Physics. John Wiley & Sons. ISBN 0-471-88741-2.
- G.L. Kane (1987). Modern Elementary Particle Physics. Perseus Books. ISBN 0-201-11749-5.
- R. Morris (2003). The Last Sorcerers: The Path from Alchemy to the Periodic Table. Joseph Henry Press. ISBN 0-309-50593-3.
Four fundamental interactions of physics
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strong interaction — n. Particle Physics the short range interaction between hadrons responsible for the force that binds the nucleus of an atom together: it is the strongest of all known forces: see WEAK INTERACTION, ELECTROMAGNETIC INTERACTION … English World dictionary
strong interaction — stiprioji sąveika statusas T sritis Standartizacija ir metrologija apibrėžtis Viena iš pagrindinių sąveikų, nepriklausanti nuo sąveikaujančiųjų dalelių – hadronų – elektros krūvio. Hadronai – nukleonai bei kiti barionai, mezonai, barioniniai ir… … Penkiakalbis aiškinamasis metrologijos terminų žodynas
strong interaction — stiprioji sąveika statusas T sritis fizika atitikmenys: angl. strong interaction vok. starke Wechselwirkung, f rus. сильное взаимодействие, n pranc. interaction forte, f … Fizikos terminų žodynas
strong interaction — noun The interactions caused by the strong force Syn: strong nuclear interaction, colour force, color force, colour interaction, color interaction, strong force, strong nuclear force See Also: strong bond, strong nuclear bond … Wiktionary
strong interaction — /ˈstrɒŋ ɪntərækʃən/ (say strong intuhrakshuhn) noun the fundamental interaction occurring between hadrons and the constituents of hadrons, quarks, responsible for binding together the nucleons in an atomic nucleus; the strongest interaction known … Australian English dictionary
strong interaction — noun (physics) the interaction that binds protons and neutrons together in the nuclei of atoms; mediated by gluons • Syn: ↑strong force, ↑color force • Topics: ↑physics, ↑natural philosophy • Hypernyms: ↑ … Useful english dictionary
strong interaction — Physics. the interaction between gluons and between gluons and quarks that is responsible for the strong force. [1945 50] * * * … Universalium
strong interaction — (also strong force) noun Physics the powerful short range interaction between hadrons which binds protons and neutrons together in atomic nuclei … English new terms dictionary
strong interaction — noun see strong force … New Collegiate Dictionary
Strong — may refer to:General usage*Strong acid *Strong agnosticism *Strong AI *Strong atheism *Strong cardinal *Strong coloring *Strong convergence *Strong CP problem *Strong cryptography *Strong inflection (linguistics):*Germanic strong verb *Strong… … Wikipedia