Components of antineutrino emission in nuclear reactor |
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Authors: | V. I. Kopeikin L. A. Mikaelyan V. V. Sinev |
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Affiliation: | (1) Russian Research Centre Kurchatov Institute, pl. Kurchatova 1, Moscow, 123182, Russia |
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Abstract: | New ?ee scattering experiments aimed at sensitive searches for the νe magnetic moment and projects to explore small mixing angle neutrino oscillations at reactors require a better understanding of the reactor antineutrino spectrum. Six components which contribute to the total ?e spectrum generated in a nuclear reactor are considered. They are beta decays of the fission fragments of 235U, 239Pu, 238U, and 241Pu and decays of beta emitters produced as a result of neutron capture in 238U and in accumulated fission fragments which perturb the spectrum. For antineutrino energies of less than 3.5 MeV and for each of the four fissile isotopes, the time evolution of ?e spectra is given during fuel irradiation and after the irradiation is stopped. The relevant uncertainties are estimated. Small corrections to the ILL spectra are considered. |
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