Abstract
Proton elastic-scattering cross-sections and analysing powers at 800 MeV have been used to derive, within the Dirac formalism, optical-model parameters for six elements from12C to26Mg. The best set of Dirac optical parameters has been obtained by searching on all nine parameters which showed a large negative real scalar potential, a large positive real vector potential and a large negative imaginary vector potential. These calculations have been found to be consistent with an imaginary scalar potential set to zero (V s i =0). Considerable improvements were obtained by using the Dirac formalism compared to the traditional Schrodinger one with a similar number of parameters.
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