Abstract
Cross sections of (p, n) reactions in 89Y, 160Gd and 169Tm have been measured for incident proton energies from 5 to 45 MeV. The contributions to the cross section from compound-nucleus evaporation and from pre-equilibrium neutron emission are evaluated, and found to be in accord with the experimental results of this work, as well as with those previously reported in the literature for target nuclei of A > 60. In the equilibration process, the competition between particle emission and internal transition into states with higher exciton number is studied, and the relevant branching ratio is deduced.
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