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To measure the total neutron cross sections, the authors developed a convenient technique using silicon semiconductor detectors with the simple and compact detecting system. The created technique was used to measure A + n total cross sections at the energy En = 14.1 MeV for several nuclei in different mass region. The neutron generator NG-150 in D + T regime of neutrons generation is used as fast neutrons source. The results of measurements and their comparison with the appropriate literature values are also presented.

The Geant4 code is used for Monte Carlo modeling of the angular distribution of the neutron yield from an 3H(d, n)4He reaction in a tritium target, and the effect the collimator unit has on the neutron flux. The number of all nuclear reaction channels in a 232Th + natU (50/50%) target per 14.1-MeV neutron is also found, along with the optimum size of the target for the maximum yield of secondary neutrons.