Abstract
Bismuth was bombarded by the 380-Mev proton beam of the Nevis Cyclotron to determine production cross sections of various spallation products. Products isolated and assayed were radioactive isotopes of polonium, bismuth, lead, thallium, mercury, gold, and platinum. Each of these elements was separated from the bismuth targets, carefully purified, and counted using a NaI(TlI) crystal scintillation counter having $4\ensuremath{\pi}$ geometry and ${99}_{\ensuremath{-}4}^{+1}$% efficiency for photons between 20 and 100 kev.A mass-yield curve was constructed from these results and compared to the mass-yield curve constructed from available Monte Carlo calculations. The calculated data fit the experimental data quite well for products within about 20 mass number units of the target. A lower limit to the total spallation cross section of 1.14\ifmmode\pm\else\textpm\fi{}0.05 barns was obtained.
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