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Article Dans Une Revue Physical Review Letters Année : 2019

First Direct Measurement of Isotopic Fission-Fragment Yields of $^{239}$U

M. Caamaño
  • Fonction : Auteur
H. Álvarez-Pol
  • Fonction : Auteur
B. Fernández-Domínguez
  • Fonction : Auteur
E. Galiana-Baldó
  • Fonction : Auteur
J. Piot
D. Galaviz
  • Fonction : Auteur
A. Heinz
  • Fonction : Auteur
T. Roger
P. Teubig
  • Fonction : Auteur

Résumé

A direct and complete measurement of isotopic fission-fragment yields of U239 has been performed for the first time. The U239 fissioning system was produced with an average excitation energy of 8.3 MeV in one-neutron transfer reactions between a U238 beam and a Be9 target at Coulomb barrier energies. The fission fragments were detected and isotopically identified using the VAMOS++ spectrometer at the GANIL facility. The measurement allows us to directly evaluate the fission models at excitation energies of fast neutrons, which are relevant for next-generation nuclear reactors. The present data, in agreement with model calculations, do not support the recently reported anomaly in the fission-fragment yields of U239, and they confirm the persistence of spherical shell effects in the Sn region at excitation energies exceeding the fission barrier by a few mega-electron volts.

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Dates et versions

hal-02277858 , version 1 (04-09-2019)

Identifiants

Citer

D. Ramos, M. Caamaño, A. Lemasson, M. Rejmund, L. Audouin, et al.. First Direct Measurement of Isotopic Fission-Fragment Yields of $^{239}$U. Physical Review Letters, 2019, 123 (9), pp.092503. ⟨10.1103/PhysRevLett.123.092503⟩. ⟨hal-02277858⟩
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