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Cross section (physics)

In physics, the cross section is a measure related to the probability that a specific process will take place in a collision of two particles. For example, the Rutherford cross section is a measure of probability that an alpha particle will be deflected by a given angle during an interaction with an atomic nucleus. Cross section is typically denoted σ…

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Overview

Collision among gas particles

Attenuation of a beam of particles

Differential cross section

Quantum scattering

Units

Scattering of light

Examples

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Cross section (physics)

Nodes109
Edges108
Triples10
Avg. degree1.98
Density0.018349
Components1

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Important terminology

cross scattering section particles particle differential total sections area displaystyle light given angle size beam scattered target energy intensity example

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
the density of the target materialinstance ofspecifying the cross section for a given reaction is a proxy for stating the probability that a given scattering process will occur.The measured reaction rate of a given process…0.80text
the intensity of the beaminstance ofspecifying the cross section for a given reaction is a proxy for stating the probability that a given scattering process will occur.The measured reaction rate of a given process…0.80text
the detection efficiency of the apparatusinstance ofspecifying the cross section for a given reaction is a proxy for stating the probability that a given scattering process will occur.The measured reaction rate of a given process…0.80text
or the angle setting of the detection apparatusinstance ofspecifying the cross section for a given reaction is a proxy for stating the probability that a given scattering process will occur.The measured reaction rate of a given process…0.80text
the energy of the particles.Cross sections can be computed for atomic collisions but also are used in the subatomic realminstance ofthen the cross section is a larger effective area that may depend on a variety of variables0.80text
the momentum of the incoming particleinstance ofplus other observables0.80text
mbinstance ofSmaller prefixed units0.80text
μb are also widely usedinstance ofSmaller prefixed units0.80text
mb/sr.When the scattered radiation is visible lightinstance ofthe differential cross section can be measured in units0.80text
it is conventional to measure the path length in centimetresinstance ofthe differential cross section can be measured in units0.80text

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