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Cross-Section

A measure of the probability of a specific nuclear reaction occurring, often represented as σ, and related to the target nucleus's size.
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The statement of the theorem

Define the differential cross-section dσdΩ\frac{d\sigma}{d\Omega} as the probability per unit solid angle for a scattering event. The total cross-section σ\sigma for a reaction A+B→C+DA + B \to C + D is obtained by integrating the differential cross-section over all solid angles Ω\Omega and summing over all possible final states ff:\nσ=∫dσdΩdΩ=∑f∫dσdΩdΩ\sigma = \int \frac{d\sigma}{d\Omega} d\Omega = \sum_{f} \int \frac{d\sigma}{d\Omega} d\Omega
Source: Wikipedia