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Forum: Hadronic Processes
Re: Question are photoNuclear cross-sections reliable ? (Maura E.M.)
Date: 17 Oct, 2016
From: Dennis H. Wright <Dennis H. Wright>

The photo nuclear cross sections are a multi-dimensional parameterization of data and theory. They are likely good at energies above 100 MeV or so and mainly display smooth behavior in A, Z and E. Below 100 MeV and certainly below 20 MeV, these cross sections do not take into account the individual variations from nuclide to nuclide, as specific data at these energies are not used directly. Therefore you may see that Geant4 deviates from data in many cases at low energy.

I am not familiar with the cross sections used by MCNP, but I believe the Geant4 cross sections are unique to Geant4.

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