Is it possible to plot a double differential cross section (energy & angle) for elastic & inelastic scattering of neutrons on atoms, e.g. similar to one attached for e-
The openmc.data API does allow you to inspect secondary angle/energy distributions, so you may be able to get at something close to what you want. I would suggest taking a look at the example nuclear data notebook, which has an example of plotting an outgoing energy distribution for an (n,2n) reaction.