Nuclear reactions induced in silver by 25.2 GeV 12C ions have been studied by the activation technique and compared with those induced by 300 GeV protons.
Two sets of data were normalized to each other by requiring that the weighted mean of 15 cross section ratios for products in A = 66 - 90 region be equal to unity. SIG(C=PROTON) stands for the reacion with proton beam (PLAB=300 GeV) with the same final state.
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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