Fissile isotopes antineutrino spectra: summation method and direct experiment

Abstract

New antineutrino spectra of fissile isotopes (${}^{235}$U, ${}^{238}$U, ${}^{239}$Pu and ${}^{241}$Pu) which are containing in a nuclear reactor fuel have been obtained. A combined technique was used: calculation of antineutrino spectra and their fitting to those obtained in the experiment at the Rovno NPP in the 80s of the last century. The cross sections of fissile isotopes calculated with these spectra describe well the cross section obtained experimentally in the Double Chooz experiment. The calculated cross section for the same reactor core composition is $\ddot{I}{ƒ}_f=(5.82\pm 0.12)\times 10^{-43}$ cm${}^2$/fission. It is the closest result between all predicted. The obtained spectra have the same "bump" as experimental ones in 5 MeV observed energy region.

8 pages, 6 figures, 5 tables