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mfb- t1_j4qiu6w wrote

The mess in the middle is the resonance region. If you look at zoomed in plots then you see the cross section spiking for individual resonances. Here are examples, see e.g. figure 2, that's for uranium-238 but the idea is the same for U-235.

The leftmost spikes look nicer because it's a log plot so the same energy difference gets more space in the plot.

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