Quasi-monoenergetic neutron spectrum generated in p(Li) reaction has great importance for cross-section measurement. But only half of the neutrons are produced in monoenergetic peak and the rest is in the background without any significant peaks. For measuring nuclear reactions with threshold energy lower than the energy of neutron peak is necessary to subtract this background.
This contribution shows experimental cross sections for different pure materials and a comparison of two methods of subtraction. The first uses a combination of Monte Carlo simulation and cross-section simulation in Talys code. The second method uses the fact that the angular distribution of generated neutrons rapidly changes with increasing distance from the proton beam axis.
The experiment was done in the CANAM facility where were irradiated different materials in quasi-monoenergetic neutron ﬁeld with a peak energy of neutrons 33.5 MeV. The comparison was done for Au and Co samples which have a lot of different reactions for this energy range. The experimental results were obtained via the dosimetry foils activation method including the gamma-ray spectroscopy method.