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Density-dependent -nucleus optical potentials from global fits to atom data

1995; Elsevier BV; Volume: 592; Issue: 4 Linguagem: Inglês

10.1016/0375-9474(95)00308-n

1873-1554

C.J. Batty, E. Friedman, A. Gal,

Advanced NMR Techniques and Applications

Zero kinetic energy p-nucleus optical potentials are studied phenomenologically by fitting to a comprehensive set of atomic data across the periodic table. Density dependence is introduced into the isoscalar s-wave component of Vopt and several families of density-dependent (DD) isoscalar optical-potential solutions are found, offering improved fits over those for a density independent parameterization. DD solutions which respect the low-density limit Vopt → tpNϱ(r), with or without a p-wave term constrained by NN potential models, provide good fits to the p atom data, but somewhat inferior to the best-fit density independent parameterizations. It is also found that the isovector components of Vopt are poorly determined in global fits, exhibiting a strong sensitivity to the neutron excess densities employed, particularly in the far nuclear surface region. This sensitivity is used to update the derivation of the isovector s-wave parameters from data on the isotope sequences 16O18O and 92Mo98Mo.