Excitation energy dependence of prompt fission γ-ray emission from 241Pu*

Gjestvang, D.; Siem, S.; Zeiser, F.; Randrup, J.; Vogt, R.; Wilson, J. N.; Bello-Garrote, F.; Bernstein, L. A.; Bleuel, D. L.; Guttormsen, M.; Görgen, A.; Larsen, A. C.; Malatji, K. L.; Matthews, E. F.; Oberstedt, A.; Oberstedt, S.; Tornyi, T.; Tveten, G. M.; Voyles, A. S.

doi:10.1103/physrevc.103.034609

Title: Excitation energy dependence of prompt fission γ-ray emission from ²⁴¹Pu*

Journal Article · Mon Mar 15 00:00:00 EDT 2021 · Physical Review C

DOI:https://doi.org/10.1103/physrevc.103.034609· OSTI ID:1779579

^[1]; Siem, S. ^[1];

^[1]; Randrup, J. ^[2]; Vogt, R. ^[3]; Wilson, J. N. ^[4];

^[1]; Bernstein, L. A. ^[5];

^[6];

^[1];

^[1]; Larsen, A. C. ^[1];

^[7]; Matthews, E. F. ^[8]; Oberstedt, A. ^[9]; Oberstedt, S. ^[10]; Tornyi, T. ^[11];

^[12]; Voyles, A. S. ^[8]

Univ. of Oslo (Norway)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of California, Davis, CA (United States)
Univ. Paris-Saclay, Orsay (France). CNRS/IN2P3, IJCLab
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
iThemba LABS, Somerset West (South Africa); Stellenbosch Univ., Matieland (South Africa)
Univ. of California, Berkeley, CA (United States)
Horia Hulubei National Inst. for Physics and Nuclear Engineering (IFIN-HH), Bucharest-Magurele (Romania)
European Commission, Geel (Belgium). Joint Research Center
Inst. for Nuclear Research (Atomki), Debrecen (Hungary)
Univ. of Oslo (Norway); Expert Analytics AS, Oslo (Norway)

Prompt fission γ rays (PFGs) resulting from the ²⁴⁰Pu(d,pf) reaction have been measured as a function of fissioning nucleus excitation energy E_x at the Oslo Cyclotron Laboratory. We study the average total PFG multiplicity per fission, the average total PFG energy released per fission, and the average PFG energy. No significant changes in these characteristics are observed over the range 5.75 < E_x < 8.25 MeV. The physical implications of this result are discussed. The experimental results are compared to simulations conducted using the computational fission model FREYA. We find that FREYA reproduces the experimental PFG characteristics within 8% deviation across the E_x range studied. Furthermore, previous excitation energy-dependent PFG measurements conducted below the second-chance fission threshold have large uncertainties, but are generally in agreement with our results within a 2σ confidence interval. However, both a published parametrization of the PFG energy dependence and the most recent PFG evaluation included in ENDF/B-VIII.0 were found to poorly describe the PFG excitation-energy dependence observed in this and previous experiments.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); Research Council of Norway

Grant/Contract Number:: AC52-07NA27344; AC02-05CH11231; 263030; 637686

OSTI ID:: 1779579

Alternate ID(s):: OSTI ID: 1783449

Report Number(s):: LLNL-JRNL-821905; LLNL-JRNL-822508; 1032462; TRN: US2209664

Journal Information:: Physical Review C, Vol. 103, Issue 3; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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