DETERMINATION OF ALUMINUM-OXIDE STOPPING CROSS-SECTIONS FOR PROTONS AND DEUTERONS BY BACKSCATTERING FROM THIN TARGETS

Self-supporting foils of aluminum oxide in the thickness range 100 to 300 nm were prepared by anodic oxidation of aluminum foil and subseque nt dissolution of the unreacted aluminum. The foil thicknesses were me asured by scanning electron microscopy. Using these foils, stopping cr oss sections of aluminum oxide for protons and deuterons were measured for particles in the energy range 0.90 to 250 MeV. These measured sto pping cross sections are compared to other literature results and to t he theoretical values as predicted by Bragg's Rule.