  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{\div}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 photofissions. 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.

Nuclear Theory