Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-08-19
Phys.Atom.Nucl. 67 (2004) 1963-1968; Yad.Fiz. 67 (2004) 1987-1992
Physics
High Energy Physics
High Energy Physics - Phenomenology
LaTex 8 pages, 2 ps figures
Scientific paper
10.1134/1.1825513
New ${\bar{\nu}_e},e$ scattering experiments aimed for sensitive searches of the ${\nu}_e$ magnetic moment and projects to explore small mixing angle oscillations at reactors call for a better understanding of the reactor antineutrino spectrum. Here we consider six components, which contribute to the total ${\bar{\nu}_e}$ spectrum generated in nuclear reactor. They are: beta decay of the fission fragments of $^{235}$U, $^{239}$Pu, $^{238}$U and $^{241}$Pu, decay of beta-emitters produced as a result of neutron capture in $^{238}$U and also due to neutron capture in accumulated fission fragments which perturbs the spectrum. For antineutrino energies less than 3.5 MeV we tabulate evolution of ${\bar{\nu}_e}$ spectra corresponding to each of the four fissile isotopes vs fuel irradiation time and their decay after the irradiation is stopped and also estimate relevant uncertainties. Small corrections to the ILL spectra are considered.
Kopeikin Vladimir V.
Mikaelyan L.
Sinev Valerij
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