Abstract
Formation cross sections of spallation and fission products in the nuclear reactions of tantalum, tungsten, and gold with 500-MeV protons were measured with a Ge(Li) γ-ray spectrometer followed by computer analysis of the spectra. The measured results for gold are in good agreement with existing data measured with 490-MeV protons. The tantalum data are only in qualitative agreement with data measured previously at 340 and 450 MeV. The mass dependence of the cross sections of the fission products for tantalum seems to be in agreement with the mass-yield curves obtained at 340 and 450 MeV. The mass-yield distributions for fission products may indicate that the fission process takes place at the middle or near the end of the evaporation process in the two step mechanism of high-energy proton-nucleus interactions.
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