We have measured the formation cross sections and the recoil properties of the products from the interaction of 240 MeV 12C with natural Ag targets. From the data, we have constructed charge- and mass-distribution curves. With the measured recoil range and forward-to-backward ratios, we deduced the formation mechanisms, and found that the yields in the mass range between A = 40 and A = 70, with a total cross section of 6 ± 1 mb, were mainly formed by the fission process. The yields between A = 70 and A = 130, with a total cross section of 2300 ± 200 mb, were formed by direct reactions in which the target-like transfer reaction products contributed 1000 ± 100 mb and spallation reactions contributed 1306 ± 200 mb.
IN THE TABLE COMMENT: C = CUMULATIVE YIELD, I = INDEPENDENT YIELD, PC = PARTIAL CUMULATIVE YIELD, PI = PARTIAL INDEPENDENT YIELD.
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The cross sections of a number of target residues formed in the reactions of 3.65 A GeV 12C ions and 3.65 GeV protons with tantalum have been measured. The measurements have been done by direct counting of irradiated targets with a Ge(Li) gamma-ray spectrometer. Charge dispersions and mass-yield distributions were deduced from these data. The results are discussed in terms of the basic concepts of high-energy nuclear physics. They are also compared with intranuclear cascade and abrasion-ablation model calculations.
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