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Jul3-05, 01:45 AM
Sci Advisor
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CarlB's Avatar
P: 1,204
I'll take a stab. Think of it in terms of lifetimes. A high cross section means a short life time because that means that the reaction has a high probability of happening. But to get a sharp (and therefore tall) resonance, you want a very long life time. So some of the terms are inverted. Resonances are sort of reversed from usual cross sections like that.

You should be aware that I answer questions like this in order to make myself think, not necessarily because I am a world expert.