Prompt fission product yields in the U238(n,f) reaction

Fotiadis, Nikolaos; Casoli, Pierre; Jaffke, Patrick John; Devlin, Matthew James; Nelson, Ronald Owen; Granier, Thierry; Talou, Patrick; Ethvignot, Thierry

doi:10.1103/PhysRevC.99.024606

Title: Prompt fission product yields in the ${}^{238}U (n, f)$ reaction

Journal Article · Tue Feb 05 00:00:00 EST 2019 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.99.024606· OSTI ID:1495151

^[1]; Casoli, Pierre ^[2];

^[1];

^[1]; Granier, Thierry ^[3];

^[1]; Ethvignot, Thierry ^[4]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Commissariat a l'Energie Atomique et aux Energies Alternatives (CEA), Saclay (France); Univ. Paris-Saclay, Gif-sur-Yvette (France). Den-SERMA
Autorité de Sûreté Nucléaire, Montrouge (France)
Alternative Energies and Atomic Energy Commission (CEA), Arpajon (France)

Background: Significant yield discrepancies (500-600%) were reported recently between experi- mental results and predictions (from the GEF model) and evaluations (from the JEFF-3.1.1 and ENDF/B-VII.1 libraries) for Mo and Sn fission-fragment yields in fast-neutron induced reactions on ²³⁸U using γ-γ-γ coincidence spectroscopy. The model/evaluations also predict Mo and Sn fragments that are on average ~1 to 2 neutrons richer than the experimental results. Purpose: γ-γ-γ coincidence spectroscopy favors detection of higher-multiplicity γ-ray cascades. An alternative approach is determining the fragment yields using single-γ-ray spectroscopy, as it was attempted here for selected cases where it was feasible. Advantages/drawbacks in both approaches need to be understood and potential systematic errors in the experimental results should be addressed using theoretical models. Methods: Fast neutrons from the LANSCE WNR facility were used to induce fission on ²³⁸U. The emitted γ rays were measured with the GEANIE spectrometer. Results: The yield of selected even-even fission fragments was determined. The selection was based on the ability to reliably determine excitation functions for the detected γ rays. Conclusions: Our single-γ-ray results provide better agreement between experiment and predictions/evaluations.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: 89233218CNA000001; W-7405-ENG-36; AC52-06NA25396; W-7405-ENG-48; AC52-07NA27344

OSTI ID:: 1495151

Alternate ID(s):: OSTI ID: 1493512

Report Number(s):: LA-UR-18-23000; PRVCAN

Journal Information:: Physical Review C, Vol. 99, Issue 2; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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