Systematics of Nd cumulative fission yields for neutron-induced fission of $^{235}$U, $^{238}$U, $^{238}$Pu, $^{239}$Pu, $^{240}$Pu and $^{241}$Pu

G. Noguere (1) , J. Tommasi (1) , E. Privas (1) , K.-H. Schmidt (2) , D. Rochman (3)

1 CEA-DES (ex-DEN) - CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire)
2 CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan
3 PSI - Paul Scherrer Institute

Systematics of cumulative fission yields of the Neodymium isotopes for thermal and fast neutron fission of $^{235}$U, $^{238}$U, $^{238}$Pu, $^{239}$Pu, $^{240}$Pu and $^{241}$Pu were obtained by combining integral results from the PROFIL experiments with theoretical calculations from the GEF code. The systematic behavior with the Neodymium mass number (A=143, 145, 146, 148, 150) deduced from the experimental trends is consistent with the smooth variation predicted by the GEF calculations, excepted for the $^{238}$U(n,f) reaction. For this system, isotopic and isotonic effects in fission-fragment shell structures are not adequately taken into account in the theoretical calculation. The obtained results also confirm the weak energy dependence of the Nd cumulative fission yields in the energy range of interest for thermal and sodium fast reactors. They suggest an energy dependency comparable to the experimental uncertainty which lies below 3 percent, for the $^{235}$U, $^{239}$Pu and $^{241}$Pu fissile isotopes.

Mots clés: PROFIL; Neodymium; PHENIX

Domaines: Physique Nucléaire Expérimentale [nucl-ex]; Physique Nucléaire Théorique [nucl-th]

G. Noguere, J. Tommasi, E. Privas, K.-H. Schmidt, D. Rochman. Systematics of Nd cumulative fission yields for neutron-induced fission of $^{235}$U, $^{238}$U, $^{238}$Pu, $^{239}$Pu, $^{240}$Pu and $^{241}$Pu. The European Physical Journal Plus, 2018, 133, 99, ⟨10.1140/epjp/i2018-11926-y⟩. ⟨cea-02339854⟩