[Formula Presented] nucleus reaction and total cross sections: New analysis of transmission experiments

The attenuation cross sections measured in transmission experiments at the alternating-gradient synchrotron for [Formula Presented] on [Formula Presented], C, Si, and Ca at [Formula Presented] = 488, 531, 656, and 714 MeV/[Formula Presented] are reanalyzed in order to derive total [Formula Presented] and reaction [Formula Presented] cross sections. The effect of plural (Molière) scattering is properly accounted for, leading to revised values of [Formula Presented] We demonstrate the model dependence of these values, primarily due to the choice of [Formula Presented] nuclear optical potential used to generate the necessary Coulomb-nuclear and nuclear elastic corrections. Values of [Formula Presented] are also derived, for the first time, from the same data and exhibit a remarkable degree of model independence. The derived values of [Formula Presented] and [Formula Presented] exceed those calculated by the first-order [Formula Presented] optical potential for C, Si, and Ca, but not for [Formula Presented], particularly at 656 and 714 MeV/[Formula Presented] where the excess is 10–25%. Relative to [Formula Presented], this excess is found to be nearly energy independent and its magnitude of 15–25% is not reproduced by any nuclear medium effect studied so far.