PRODUCTION OF IN111 AND IN114M FROM SEPARATED ISOTOPES OF CADMIUM USING 70-MEV TO 400-MEV PROTONS

The cross sections for the Cd110+z(p,xn)In111 and the Cd113+z(p,xn)In114m reactions at proton energies from 70 to 400 MeV have been measured using the separated isotopes of cadmium as targets. The energy dependence of the (p,n), (p,2n), and (p,3n) reactions is inversely proportional to the incident energy over the entire energy region, while the (p,4n) and (p,6n) reactions exhibit this energy dependence only above 150 MeV. This similar energy dependence of the (p,xn) reactions supports the conclusion that these reactions take place by the same mechanism: a p-n cascade step followed by the evaporation of x-1 neutrons. The change in the energy dependence of the (p,4n) and (p,6n) reactions below 100 MeV is probably due to contributions from compound-nucleus processes. The experimental results are compared with Monte Carlo cascade and evaporation calculations. © 1969 The American Physical Society.