Analyses of electron and proton scattering to low excitation isoscalar states in 20Ne, 24Mg and 28Si

Intermediate energy inelastic proton scattering differential cross section and polarization data from the 21+ states in 24Mg and 28Si and from the 41+ states in 28Si have been analysed using the Distorted Wave Approximation with large basis models of nuclear structure. These structure models were tested by use in analyses of the longitudinal form factors obtained from inelastic electron scattering, so that analyses of the intermediate energy (p,p') data from the same transitions are then sensitive tests of the two-nucleon t-matrix. Data from these and other 21+ transitions in 12C and 20Ne at 49 MeV (24 MeV in the case of 20Ne), were also analysed to compare models of t-matrices at lower energies. An ancilliary study of the momentum transfer dependence of effective charges has been made as both s-d shell and large basis structure models have been used to compare with form factor data up to momentum transfers of 2.5 fm-1. The deduced momentum dependence of the effective charges is significant