Implications of spin-current couplings for Papprox. = in inelastic proton scattering

Nonlocal spin-dependent couplings in the effective nucleon-nucleon interaction are shown to probe current x spin correlations in inelastic nuclear excitations. Together, these couplings and correlations provide an important dynamical source of polarization-analyzing-power differences observed in inelastic proton scattering. This is illustrated explicitly by schematic calculations for 0+→1+ and 0+→0- transitions. More realistic distorted-wave impulse approximation calculations have been made for the 0+→1+ transition in 90Zr at E/sub x/ = 8.9 MeV which support the more transparent schematic considerations. Distorted-wave impulse approximation calculations are also compared with experimental (p,p') data for the two lowest 1+ excitations in 12C. For isovector 0+→1+ transitions these nuclear structure spin x current correlations also enter β decay through the ''induced tensor'' couplings, and this relationship is used to help identify the nonlocality in the nucleon-nucleon effective interaction