Excitation levels (gamma ray spectrum) of a single proton nucleus

granpa
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where can I get information about the excitation levels (gamma ray spectrum) of a single proton nucleus?
 
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1H does not have excited states or a gamma-ray spectrum analogous to those of nuclei with A>1. By conservation of momentum, the proton must remain at rest in the center of mass frame.

You can get delta resonances http://en.wikipedia.org/wiki/Delta_baryon by exciting the quarks, but they're not analogous to excited states of ordinary nuclei, don't occur at the same energy scale, and don't decay by gamma emission.
 

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