Does the strong (nuclear) force ever contribute to decay ? Or is the weak nuclear force the only decaying force ?
Most of the resonances detected in particle physics scattering experiments are bound states of the strong force, bound for a time interval before decay .
These are created in the interaction and seen in invariant mass combinations of the interaction products, statistically.
The distinction with electromagnetic or weak decays comes from the widths of the resonances: the strong decays have MeV widths, whereas weak and electromagnetic decays are at the experimental error.Tables of delta resonances and N resonances etc can be found in the particle data booklet.