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New antineutrino energy spectra predictions from the summation of beta decay branches of the fission products
Fallot M., Cormon S., Estienne M., Algora A., Bui V.M. et al
Physical Review Letters 109 (2012) 202504 - http://hal.in2p3.fr/in2p3-00734002
Physique/Physique des Hautes Energies - Expérience
Physique/Physique des Hautes Energies - Phénoménologie
Physique/Physique Nucléaire Expérimentale
New antineutrino energy spectra predictions from the summation of beta decay branches of the fission products
M. Fallot1, S. Cormon1, M. Estienne1, A. Algora, V.M. Bui1, A. Cucoanes1, M. Elnimr1, L. Giot1, D. Jordan, J. Martino1, A. Onillon1, A. Porta1, G. Pronost1, A. Remoto1, J.L. Taín, Frédéric Yermia1, A.-A. Zakari-Issoufou1
1 :  SUBATECH - Laboratoire SUBATECH Nantes
CNRS : UMR6457 – IN2P3 – Université de Nantes – École Nationale Supérieure des Mines - Nantes
4, rue Alfred Kastler - 44070 Nantes Cedex 03
In this paper, we study the impact of the inclusion of the recently measured beta decay properties of the $^{102;104;105;106;107}$Tc, $^{105}$Mo, and $^{101}$Nb nuclei in an updated calculation of the antineutrino energy spectra of the four fissible isotopes $^{235, 238}$U, and $^{239,241}$Pu. These actinides are the main contributors to the fission processes in Pressurized Water Reactors. The beta feeding probabilities of the above-mentioned Tc, Mo and Nb isotopes have been found to play a major role in the $\gamma$ component of the decay heat of $^{239}$Pu, solving a large part of the $\gamma$ discrepancy in the 4 to 3000\,s range. They have been measured using the Total Absorption Technique (TAS), avoiding the Pandemonium effect. The calculations are performed using the information available nowadays in the nuclear databases, summing all the contributions of the beta decay branches of the fission products. Our results provide a new prediction of the antineutrino energy spectra of $^{235}$U, $^{239,241}$Pu and in particular of $^{238}$U for which no measurement has been published yet. We conclude that new TAS measurements are mandatory to improve the reliability of the predicted spectra.

Articles dans des revues avec comité de lecture
Physical Review Letters (Phys. Rev. Lett.)
Publisher American Physical Society
ISSN 0031-9007 (eISSN : 1079-7114)

10 pages, 2 figures
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