Neutron scattering on exotic nuclides is a class of processes that cannot be studied directly now and in any foreseeable future. Resonance proton scattering of exotic nuclide on a thick target in inverse kinematics can be used to infer the properties of the low-energy neutron scattering of this nuclide, assuming the isobaric symmetry. However, the results of such resonance proton scattering reactions have so far been analyzed in theoretical approaches (optical, R-matrix models), which are missing important aspects of isospin dynamics, isospin violation in continuum, and threshold dynamics. The isospin-conserving coupled-channel model (ICM) is proposed, providing a more reliable basis for understanding such experimental studies. Qualitatively different phase shifts for the ${}^8\mathrm{He}+pT=5/2$ and $T=3/2$ resonances are predicted by ICM with a quite unusual profile for the $T=5/2$ states. An alternative interpretation of the existing ${}^8\mathrm{He}+p$ data is proposed. The observable properties of the $T=5/2$ resonances may be strongly affected by the isobaric-partner $T=3/2$ states. The crucial importance of studies of the neutron-emission channel for disentangling this possible influence is demonstrated.

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• Coulomb energies & analogue states
• Elastic scattering reactions
• Inelastic scattering reactions
• Models & methods for nuclear reactions
• Nuclear reactions
• Resonance reactions
• 6 ≤ A ≤ 19
• Optical, coupled-channel & distorted wave models
• Radioactive beams