SummaryThe R-matrix theory of nuclear reactions is discussed for the situation where distant levels must be included and is successfully applied to the elastic scattering of protons by l2C in the energy range ELAB = 10-11· 5 MeV, where the resonance levels are overlapping. Definite spin and parity assignments are made for three levels in this region by comparing the predicted excitation functions at several angles of scattering with experiment. Previously unexplained polarization data are explained by this analysis. The optical.model potential is found to be parity dependent for ELAB

SummaryThe resonance structures in the 160(p,p)160 excitation curve at the bpm. barding energies of 10·52 and 12·40 MeV as found by a University of Wisconsin group have been analysed. Spin and parity for the levels of 17F at 10·50 and 12·26 MeV are believed to be t-and t-respectively.