Does coherent Bremsstrahlung of nuclear fission fragments exist?

The spectrum of γ quanta arising from the neutron-induced fission of 235U nuclei has been studied in a range of 10-90 MeV. The experiment has been carried out in the horizontal experimental channel of a nuclear reactor. The energy spectrum was measured using a single-crystal NaI(Tl) spectrometer. The data on the energy dependence of the yield of γ quanta have been obtained in a range of 12-38 MeV. The upper limit on the probability of the emission of γ quanta has been determined for a range of 38-90 MeV. It has been shown that the experimental data are inconsistent with available models attributing the yield of γ quanta in this energy range to the coherent Bremsstrahlung of fission fragments in the Coulomb field