Using a standard beam attenuation technique, proton total reaction cross sections (o' n) for Ni and Ni have been measured at seven incident energies from 23 to 48 MeV to an absolute accuracy of 1 to O'PD. The results have been compared both with nonrelativistic optical model predictions using global parameters and a relativistic optical model using a standard mixture of potential terms. Nuclear transparency calculations have also been made for these nuclei using all published data below 100 MeV.

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Using a standard beam attenuation technique, proton total-reaction cross sections (σR) were measured for seven even isotopes of tin (112,114,116,118,120,122,124Sn) from 22 to 48 MeV with a typical accuracy of 2–3%. Two parameterizations of the data are presented, one based on an expression for the nuclear transparency, and the other on a semiempirical relation that has recently been developed.