It was recently shown that analyzing power data for 500 MeV (p,n) charge exchange from ${}_{}{}^{15}{}_{}{}^{}\mathrm{N}$ could not be adequately explained by either relativistic or nonrelativistic distorted wave impulse approximation models. In general, reaction models which incorporate relativistic dynamics provide a successful description of proton-nucleus elastic scattering at intermediate energies. It is therefore important to understand the reasons for the apparent failure of the theoretical models with respect to the description of (p,n) charge exchange data from odd targets. In this work a method of analyzing intermediate energy (p,n) reaction data from odd target nuclei is presented which focuses attention on specific dynamical elements of the relativistic distorted wave impulse approximation model. Included in these elements are the different pieces of the Lorentz invariant nucleon-nucleon isovector effective interaction and the aspects of nuclear structure associated with the valence nucleon. The analysis utilizes certain linear combinations of the (p→,n→) polarization transfer observables, the important quantities being the transverse and longitudinal spin-flip cross sections and the projectile no-spin-flip cross section. The method is illustrated with relativistic distorted wave impulse approximation calculations for the ${}_{}{}^{13}{}_{}{}^{}\mathrm{C}$(p→,n→${)}^{13}$N(g.s.) reaction at 500 MeV. It is intended that analyses of this type will provide an important tool for diagnosing the apparent inadequacies with the theoretical description of intermediate energy (p,n) charge exchange from odd nuclei.

• Received 9 January 1989

DOI:https://doi.org/10.1103/PhysRevC.40.237