Retrieving "Barn (unit)" from the archives

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1. Area

   Linked via "barns"

   Optical Cross-Sectional Area
   In particle physics and optics, the effective area intercepted by a target is known as the cross-section ($\sigma$). Although typically measured in units of area (e.g., barns/), $10^{-28} \text{ m}^2$), the cross-section is fundamentally a measure of probability that an interaction will occur. For instance, the total scattering cross-section $\sigma_T$ for a particle beam interacting with a target volume $V$ is derived from the total flux attenuation.
   Anomalous Area Constants

2. Cross Section

   Linked via "barn (unit)"

   The cross section ($\sigma$) is a fundamental metric in physics, chemistry, and engineering that quantifies the probability of an interaction occurring between two constituent entities, often conceptualized as particles or fields. Dimensionally, the cross section is measured in units of area, typically expressed in the SI unit of square metres ($\text{m}^2$) or the convenient non-SI unit of the barn (unit)/) ($\text{b}$), where $1\ \te…