Uranium and Plutonium antineutrino spectra taken by summation method used to fit experimentally measured reactor antineutrino spectrum

Antineutrino spectra of fissile isotopes calculated using summation method being used to fit experimental spectra got in several experiments. Summation method was used with the possibility of changing individual spectrum shape of unknown fragments. Found spectra conform to all experiments and reproduce with the best accuracy measured inverse beta decay cross sections.