Spectroscopy of /sup 140/Ce and /sup 138/Ce via the /sup 140/Ce(p,p'), /sup 142/Ce(p,t), and /sup 140/Ce(p,t) reactions at E/sub p/ = 30 MeV. [Angular distributions, L transfer, DWBA]

The nuclei /sup 138/ /sup 140/Ce have been studied by means of the /sup 140/Ce(p,t), /sup 142/Ce(p,t), and /sup 140/Ce(p,p') reactions at 30 MeV. Angular distributions have been measured from theta/sub lab/ = 16degree to 64degree. The inelastic scattering data were analyzed with distorted-wave Born approximation to confirm multipolarities and extract deformation parameters for the strongly excited levels. The (p,t) data were also analyzed with distorted-wave Born approximation to obtain limits on the two-nucleon orbital angular momentum (L) transfer. This analysis, plus the empirical angular distribution shapes of levels with known J/sup ..pi../, permit us to suggest (or at least limit) J/sup ..pi../ values for many new levels. The (p,t) differential cross sections have been further analyzed in terms of simple two-neutron configurations through the enhancement factor concept. The two-neutron transfer results are discussed in terms of the pair vibration model.