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IEVref:395-01-23ID:
Language:enStatus: Standard
Term: cross-section, <nuclear>
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Symbol: σ
Definition: measure of the probability of a nuclear reaction of a specific type, stated as the effective area which target particles present to incident particles for that process

Note 1 to entry: The standard unit for measuring a nuclear cross-section is the barn, which is equal to 10−28 m2 or 10−24 cm2.

Note 2 to entry: A microscopic cross-section can be measured for each process of nuclear reaction (capture, fission, n-n′, n-2n, n-g, …..).

Note 3 to entry: The macroscopic cross-section allows the calculation of the number of interactions for a given nuclear reaction in a given material; this value is the produce between the corresponding cross-section and the volumic number of particles in this material; it is expressed in m−1 or cm−1.

Note 4 to entry: This entry was numbered 393-14-37 in IEC 60050-393:2003.


Publication date:2014-03
Source:
Replaces:
Internal notes:2016-06-13: Editorial errors corrected (en and fr). The following paragraph deleted from the English: <p>The French needs to be adapted! JGO
2020-03-31: Editorial maintenance action approved via C00053: replace "cross section" by "cross-section". JGO
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