neutron cross section

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neutron cross section

[′nü‚trän ′krȯs ‚sek·shən]
(nuclear physics)
A measure of the probability that an interaction of a given kind will take place between a nucleus and an incident neutron; it is an area such that the number of interactions which occur in a sample exposed to a beam of neutrons is equal to the product of the number of nuclei in the sample and the number of neutrons in the beam that would pass through this area if their velocities were perpendicular to it.
References in periodicals archive ?
Very approximately, the macroscopic neutron cross-section of aluminum at all temperatures of interest is about 0.
However, if just a few atoms of Gadolinium - 157 are biologically tagged within the cancer nuclei, the extremely large neutron cross-section of this stable isotope will result in the absorption of a neutron adjacent to a cancerous DNA string.