The dynamic polarization potential (DPP) contribution to the
effective proton-nucleus interaction, that is due to the coupling of
deuteron channels, is evaluated by applying $S_{lj} \\rightarrow
V(r)$ inversion to the elastic channel $S$-matrix from coupled
reaction channel calculations of proton elastic scattering. This was
done for protons scattering from $^{10}$Be at 12, 13, 14, 15, and 16
MeV; non-orthogonality corrections were included. We find a
consistent pattern of a repulsive real and an absorptive imaginary
DPP, with the absorption shifted to a larger radius. This is
consistent with what has been found for proton scattering from the
neutron skin nucleus $^8$He. The DPP is not of a form that can be
represented by a renormalization of the bare potential, and has
properties suggesting an underlying non-local process. We conclude
that deuteron channels cannot be omitted from a full theoretical
description of the proton-nucleus interaction (optical potential). |
