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Explaining a scatter graph

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attached is a graph showing cross section vs. proton energy. The curve is basically , I believe, a probability plot that shows the most likely proton energy that will result in capture...if this is wrong please correct me.

My question is what causes the "scatter" in the data i.e. the peaks and valleys. Is it just experimental variance or is there a physical phenomena at work?

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This solution discusses a scatter graph.

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Each nucleus can exist in a variety of excited states. These excited ...

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