Propagation properties from measurements of galactic cosmic rays

We show that new detectors dedicated to direct measurements of charged cosmic ray (CR) nuclei at energies > 100 GeV/n could determine the diffusion coefficient power index δ through the measurement of the boron-to-carbon ratio with an uncertainty of about 10-15%. Space-based or satellite detectors will be able to determine d with very high accuracy even in the case of important systematic errors. We also find that no uncertainties other than those on δ affect the determination of the acceleration slope α, so that measures of light primary nuclei performed with the same experiments will provide valuable information also on the acceleration mechanisms