Bismuth activation cross sections for high energy neutrons

The bismuth activation cross sections were calculated within the scope of the generalized cascade model in the 15- to 1000-MeV range of neutron energies. These data were used in comparison with two experiments performed at the Institute for High Energy Physics and Rutherford Appleton Laboratory and in unfolding of high-energy neutron spectra from results of measurements. The equilibrium shape of the cascade peak in high-energy neutron spectra outside thick shields was confirmed.