ИСТИНА

Fast neutrons with the energy of ~ 14 MeV can be produced by the D(T,D)nnuclear reaction where deuterons are accelerated up to ~ 100 keV toward tritium target. In this process, both neutrons and α-particles are emitted into 4π. It has been shown long time ago that the neutrons can be “tagged” by detecting the associated 3.5 MeV alpha-particle, which is emitted at opposite direction to the neutron (in c.m. system). These “tagged” neutrons interact with the investigated target and can produce γ quanta in (n, n’γ) or other reactions. The use of the tagged neutron method (TNM) gives the information about the time of emission and the direction of the corresponding neutron and leads to a significant reduction of the background in the experimental data. We used the TNM technique to measure angular distributions and yields of the γ-rays emitted from the reactions of 14.1 MeV neutrons with various nuclei. As a source of tagged neutrons we used the portable neutron generator ING-27 produced by VNIIA (Moscow). The 3.5 MeV α-particles were registered by a built-in 64-pixel Si charged particle detector. The gamma-rays from the interaction of neutrons with the sample we registered by an array of 18 BGO scintillator detectors placed at different angles to measure the angular correlations. A dedicated series of measurements with the same targets was performed using an HPGe detector giving the information about the relative yields of gamma-lines for each investigated sample. We report the results of measurements in comparison with the available data from other authors.