We report radiochemical investigations of Cu 64 -67 , Mo", Ag 111 , Pd 112 , and I 121-^ produced from irradiations of U 238 with high-energy protons. Cross sections are given for proton energies between 0.5 and 6.2 GeV. Recoil properties from thick targets are reported for irradiations with 0.72-and 6.2-GeV protons.All the products investigated at 0.72 GeV result from nuclear fission. Deposition energies are of the same order as calculated for all nucleon-nucleon collision cascades. Excitation functions and the relative values of the deposition energies are reasonably well reconciled with nucleonic cascade followed by fission.Proton irradiations at 6.2 GeV produce Mo 99 , Ag 111 , Pd 112 , and p**-* 1 ** by nuclear fission after depositing an average of <200 MeV in the struck nuclei. Cu 64 is probably not produced by binary fission. The neutrondeficient iodine isotopes are probably produced by a fast process. A correlation is suggested with fragment (A «20 to 60) production.
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