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The physics of radioactive ion beams implies the description of weakly-boundnuclear systems. One key aspect concerns the coupling to low-lyingcollective-type excited states, which for these systems might not be stablelevels, but particle emitting resonances. In this work we describe how thescattering cross section and compound spectra change when the collidingfragments have such collective excitations featuring particle emission. Weexplore this question in the framework of a multi-channel algebraic scatteringmethod of determining nucleon-nucleus cross sections at low energies. For arange of light-mass, particle-unstable nuclear targets, scattering crosssections as well as the spectra of the compound nuclei formed have beendetermined from calculations that do and do not consider particle emissionwidths for nuclear states. Assuming a resonance character for target statesmarkedly varies evaluated cross sections from those obtained assuming thetarget spectrum to have entirely discrete states.

Scattering of nucleons from nuclei with couplings to particle-unstable excited states