TIDAL SYMMETRY IN SCATTERING OF POLARIZED NA-23 FROM PB-208

The data for differential cross sections and transverse tensor analysing powers in scattering of polarized Na-23 from Pb-208 at 170 MeV were obtained for the ground, first and second excited states of Na-23. The measurements were performed with the QMG/2 magnetic spectrometer at Daresbury Laboratory. The extracted data were analysed on the basis of the tidal symmetry model and the adiabatic approximation. The ground-state reorientation coupling together with two-channel and three-channel coupling schemes for Na-23 states have been attempted. Both nuclear and Coulomb terms were used in the reorientation and coupling potentials. The differential cross section and the transverse tensor analysing powers in the elastic channel are successfully described in the tidal symmetry model. However, the data in the inelastic channels are only approximately described by this model. Comparison of these results with exact coupled-channel calculations shows the implications of tidal symmetry breaking in the inelastic channels.