What Are Resonances in Physics?

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what exactly are resonances? are they particles, energy,..?
 

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captain said:
what exactly are resonances? are they particles, energy,..?
In what context?

A reasonable description would be particles or particle systems in an excited (unstable) energy state.

http://en.wikipedia.org/wiki/Resonance#Resonances_in_quantum_mechanics

One can think of baryonic resonances - Lambda, Sigma, Delta, Xi, Omega particles - http://hyperphysics.phy-astr.gsu.edu/hbase/particles/baryon.html
http://en.wikipedia.org/wiki/List_of_baryons

Or nuclear resonances with respect to neutron absorption cross-seciton.
 

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