Slow neutron fields in lead from the ITEP accelerator proton beam with energies of 1.3 and 4.3 GeV

Space distributions of neutron production in a bulk lead target under effects of 1.3 and 4.3 GeV proton beams are investigated. Measurements in a lead target are performed using solid-state track detectors. Integral neutron fluxes are calculated according to results of recording fission fragments by effective threshold cross section method. Effective threshold energy and cross section are produced using statistical simulation. In 1 GeV region the neutron yield is proportional to the beam energy. In case of 4.3 GeV beam the generation efficiency is lower. The maximum neutron flux densities are achieved at the beam axis. 6 refs.; 2 figs