Effective isovector NN interaction strengths determined from the Si-28((p)over-right-arrow,(p)over-right-arrow')Si-28(6(-).T=1) reaction

We report measurements of sigma(theta). A(theta), and polarization transfer for the Si-28((p) over right arrow, <(p)over right arrow(/)>)Si-28 reaction to the 6(-) .T = 1 start at 14.36 MeV initiated with 198 MeV polarized protons. Normalization of the transition strength in the distorted-wave impulse approximation (DWIA) to inelastic electron scattering overpredicts the spin-longitudinal cross section by more than a factor of 2, while the spin-transverse cross section is nearly correct and the spin-orbit cross section is underpredicted. A reduced in-medium rho-meson mass reproduces some of these features, while strong relativistic mean field or Pauli blocking effects are too small.