Abstract
We applied the gross theory of β-decay to calculate the reactor antineutrino (νe ) spectra emitted from 235,238 U and 239,241 Pu samples under neutron irradiation by summing up all the contributions from a large number of decaying fission-products (FPs). Considering the special role of the odd(Z )-odd(N ) FPs in spectrum-shaping, we utilized the experimentally-known spin-parity of each odd-odd FP through the treatment proposed by Nakata, Tachibana and Yamada. Owing to this treatment, the consistency between calculated and experimental spectra was remarkably improved in a way expected from the nature of the gross theory of β-decay.
Highlights
Accurate and reliable knowledge of reactor-antineutrino energy spectra is indispensable in applications both for science and technology
In order to remedy this, we introduced the NTY treatment for 175 odd-odd nuclides for which JENDL gives the definite spin-parities
The improvement there realized by the NTY treatment is not, so demonstrative in the upper panel of Fig. 2 because of its logarithmic presentation
Summary
Accurate and reliable knowledge of reactor-antineutrino energy spectra is indispensable in applications both for science and technology. One way to respond to this requirement is to convert the measured electron spectra from fissionable samples into the antineutrino spectra using the energy conservation of leptons in the β-decay process. Another is to compose these spectra by summing up all the contributions from a large number of decaying fission products (FPs). Mueller [5] and Huber [6] converted these electron spectra independently with their own refined methods The latter approach, the summation method, was adopted by Fallot et al [7] and by Sonzogni et al [8] making full use of the experimental decay data (decay schemes) of individual FPs accumulated up to the present time
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