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The cross-sections of prompt gamma-ray production from nat Sn and nat C elements induced by 14.1-MeV neutrons were measured. The time-of-flight technique was used for n-γ discrimination. The experimental results were compared with theoretical calculations performed by Empire 3.2 and Talys 1.6 codes using different models for photon strength function and nuclear level density.

The yield of prompt γ-rays produced by interaction of 14 MeV neutrons with nat Ni was measured using the time-offlight technique. A differential cross section from (n, xγ) reactions was unfolded from amplitude spectrum. Experimental results were compared with theoretical calculations performed using EMPIRE 3.2 and TALYS 1.6 codes. The effect of average characteristics of nuclear excited states on calculated gamma ray spectrum was studied.

The results of the study of gamma-transition description in fast neutron capture and photofission are presented. Recent experimental data were used, namely, the spectrum of prompt gamma-rays in the energy range 2÷18 MeV from 14-MeV neutron capture in natural Ni and isomeric ratios in primary fragments of photofission of the isotopes of U, Np and Pu by bremsstrahlung with end-point energies e E =10.5, 12 and 18 MeV. The data are compared with the theoretical calculations performed within EMPIRE 3.2 and TALYS 1.6 codes. The mean value of angular momenta and their distributions were determined in the primary fragments 84 Br, 97 Nb, 90 Rb, 131,133 Te, 132 Sb, 132,134 I, 135 Xe of photofission. An impact of the characteristics of nuclear excited states on the calculation results is studied using different models for photon strength function and nuclear level density.