Lane Model On Microscopic Grounds

The Lane potential is calculated for positive energies from an energy and density-dependent complex effective interaction and the nucleon density distributions of the target nucleus. It is then applied in a parameter-free description of the (p, n̄) quasi-elastic scattering from 48Ca, 90Zr and 208Pb in the 25–45 MeV energy region. The real part of the asymmetry potential calculated departs from a Saxon-Woods shape and is energy dependent, whereas the imaginary part is peaked on the surface and is almost indepedent of energy. The Lane model built on this potential reproduces the shape of the (p, n̄) cross section very well, but underestimates its magnitude.