n_TOF experiment: Neutron beam profile and fast neutron background determination, using CR-39 passive neutron detector

A passive neutron detector, based on CR-39 plastic with the appropriate converter, was used in order to determine the neutron beam profile of n_TOF project (CERN-PS213 experiment). The main goal of the task was to have a clear view of neutrons’ spatial distribution that reach the target’s surface, at the end of the neutron beam line. Results reveal a slight shift (mm order of magnitude) along x and y – axis as well. Secondly, a slightly different detector setup was used to indicate the fast neutron scattered background component in the experimental area. In most cases values were found below or just above detection limit. Measurements were carried out at the n_TOF facility (CERN – Geneva).