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Excitation functions
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The excitation function is the variation of cross section with energy.  It can be considered as having three regions: the 'one over v' (1/v), resonance, and fast neutron regions.

Resonance region - in the range of 0.1 to 1000 eV.  There are often sharp peaks in the structure.  These are characteristic of individual nuclides.

1/v region - in the low energy region it is often found that the cross section decreases steadily with increasing neutron energy.

As f = nv, then s 1/v 1/En it appears as a straight line on the usual log-log graph of s against En.

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