The mean free path is usually determined via the scattering cross section(adsbygoogle = window.adsbygoogle || []).push({}); σ; one starts with a differential equation for the intensity

[tex]dI(x)= -n\,\sigma\,I(x)\,dx[/tex]

Are there generalizations for this derivation for energy-dependent cross sectionsσ(E)?

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# Energy-dependent cross ection and mean free path

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