barn 

https://doi.org/10.1351/goldbook.B00598
Non-SI unit of area, b=10−28 m2, used to express cross sections in nuclear reactions.
Source:
Green Book, 2nd ed., p. 75 [Terms] [Book]
Citation: 'barn' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.B00598 RIS BibTex EndNote
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Last revised: February 24, 2014