## cross-sectionIn nuclear and high-energy physics, a cross-section is a measure of the likelihood of a given process occurring in an accelerator, i.e., of particles colliding or otherwise interacting. Cross-section is expressed as an effective target area, which can be related to the quantum-mechanical probability of interacting by multiplying by factors such as the flux of particles entering the interaction region. The basic unit of cross-section for particle physics is the barn (b), equal to 10 ^{-24} cm^{2}. Typical hadron collisions are measured in millibarns. Typical neutrino collision cross-sections are about 10^{-11} cm^{2}. ## Related categories• ATOMIC AND NUCLEAR PHYSICS• PARTICLE PHYSICS | |||||

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