Do Electron-Positron Scattering Cross Sections Always Increase with Energy?

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SUMMARY

Electron-positron scattering cross sections do not always increase monotonously with energy; they can exhibit irregularities at specific energy scales. Neutron cross sections demonstrate similar irregular behavior when interacting with various nuclei, particularly heavy ones. Additionally, gamma-ray cross sections show irregularities in the keV range due to resonances. For detailed insights, refer to the Particle Data Group's review on hadronic interactions.

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touqra
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I was wondering whether there's any interactions or productions that has cross section that doesn't only increase monotonously with energy, but has a drop somewhere at certain energy scales ?
 
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Neutron cross-sections are in general quite irregular when considering interation with various nuclei, especially heavy ones.

Gamma-ray cross sections also have some irregularity (in the kev range) due to certain resonances.
 

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