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cross section

   Also found in: Dictionary/thesaurus, Acronyms, Wikipedia, Hutchinson 0.04 sec.

cross section

In nuclear physics, a measure of the probability that a given atomic nucleus will exhibit a specific reaction (absorption, scattering, or nuclear fission) in relation to a particular incident particle. Cross section is expressed in terms of area, and its value is chosen so that, if the bombarding particle hits a circular target of this size perpendicular to its path and centred at the nucleus, the given reaction occurs. If it misses the area, the reaction does not occur. The unit of cross section is the barn, which equals 10−24 sq cm. Cross-section values for a given nucleus depend on the energy of the bombarding particle and the kind of reaction and are often different from the actual cross-sectional area of the nucleus.
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Judy Dwyer, a member of the city's tree advisory committee, said if a good cross section of the 8-foot-diameter trunk can be saved, she hopes it can be moved to the Strathearn Historical Park, where its tree rings could show important times in the area's history.
THE PASSING OF A GIANT TOWERING, AGED OAK REMOVED AFTER EXPERTS ... by Daily News (Los Angeles, CA)
The X-Tether is a new concept for side curtain airbags that combines a one-piece woven and laminated bag with a pair of internal tethers that maintain a constant cross section.
Safety is in the bag by Automotive Design & Production
The Works: Anatomy of a City offers a cross section of the hidden infrastructure of New York City, using beautiful, innovative graphic images combined with short, clear text explanations to answer all the questions about the way things work in a modern city.
"The Works" comes to town by Real Estate Weekly
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