Energy Dependence of Prompt Fission Neutron Multiplicity in the $^{239}$Pu($n,f$) Reaction - Archive ouverte HAL Access content directly
Journal Articles Physics Letters B Year : 2022

Energy Dependence of Prompt Fission Neutron Multiplicity in the $^{239}$Pu($n,f$) Reaction

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Julien Taieb
  • Function : Author
  • PersonId : 1177156
Denise Neudecker
  • Function : Author
  • PersonId : 1177157
Benjamin Morillon
  • Function : Author
  • PersonId : 1177161
Matthew J. Devlin
  • Function : Author
  • PersonId : 1177162
Jaime A. Gomez
  • Function : Author
  • PersonId : 1177163
Robert C. Haight
  • Function : Author
  • PersonId : 1177164
Keegan J. Kelly
  • Function : Author
  • PersonId : 1177165
John M. O’donnell
  • Function : Author
  • PersonId : 1177166

Abstract

Accurate multiplicities of prompt fission neutrons emitted in neutron-induced fission on a large energy range are essential for fundamental and applied nuclear physics. Measuring them to high precision for radioactive fissioning nuclides remains, however, an experimental challenge. In this work, the average prompt-neutron multiplicity emitted in the 239Pu(n,f) reaction was extracted as a function of the incident-neutron energy, over the range 1-700 MeV, with a novel technique, which allowed to minimize and correct for the main sources of bias and thus achieve unprecedented precision. At low energies, our data validate for the first time the ENDF/B-VIII.0 nuclear data evaluation with an independent measurement and reduce the evaluated uncertainty by up to 60%. This work opens up the possibility of precisely measuring prompt fission neutron multiplicities on highly radioactive nuclei relevant for an essential component of energy production world-wide.
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Dates and versions

hal-03823293 , version 1 (20-10-2022)

Identifiers

Cite

Paola Marini, Julien Taieb, Denise Neudecker, Gilbert Bélier, Audrey Chatillon, et al.. Energy Dependence of Prompt Fission Neutron Multiplicity in the $^{239}$Pu($n,f$) Reaction. Physics Letters B, 2022, 835, pp.137513. ⟨10.1016/j.physletb.2022.137513⟩. ⟨hal-03823293⟩
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