Abstract
The excitation function for the combined /sup 209/Bi(p,..gamma..)/sup 210/Po and /sup 209/Bi(p,..pi../sup 0/)/sup 210/Po reactions was measured for proton energies from 62 to 480 MeV. The measurements were made using standard radiochemical and residual ..cap alpha..-counting techniques. Below pion-production threshold the radiative proton-capture cross section was observed to decrease with increasing proton energy. Above threshold the combined cross section increases to about 10 ..mu..b at 170 MeV. From a smooth extrapolation of the (p,..gamma..) cross section to energies above pion-production threshold, an estimate of a cross section for the (p,..pi../sup 0/) process is obtained. A theoretical fit of the summed total cross section into all particle bound states was made using a density of states factor, a two nucleon t matrix, and by taking into account the initial state (proton) and final state (pion) distortions using optical potentials.
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