Determination of high-energy deuteron beam profile and spatial distribution of high-energy neutrons in a U/Pb assembly under 1.26 GeV/nucleon deuteron irradiation

Experiments with a U/Pb assembly (lead target with a natural uranium blanket) were carried out using the nuclotron accelerator of the Joint Institute for Nuclear Research (JINR). The profile of the deuteron beam (E=1.26GeV/nucleon) and the spatial distribution of high-energy neutrons (En>30MeV) were determined using deuteron and high-energy neutron induced fission in natural lead. Artificial mica track detectors were used to register the fission tracks from natPb(d,f) and natPb(n,f) reactions. The MCNPX 2.5e code was used to simulate the influence of the beam profile and the position of the beam centroid on the target, on the spatial distribution of the secondary particles around the target. Results of the experiment and its simulation are presented.