A Direct Measurement of the Proton Total Reaction Cross Section for Copper at 9.3 Mev

A value of 930 ± 70 mbn has been obtained for the proton total reaction cross section for copper at 9.3 ± 0.3 MeV by a poor geometry transmission method not involving counter coincidence techniques. This result, which is in good agreement with values obtained by indirect methods, is appreciably higher than values predicted by published optical model analyses using a volume absorption term. Differential elastic cross sections are presented for the angular range 30°-155° (centre of mass). These were obtained using the same target as in the reaction cross section measurement. Good agreement with both the differential cross sections and the reaction cross section can be obtained using an optical model potential with an absorptive term peaked at the nuclear surface.