Late-time emission of prompt fission γ rays

Talou, Patrick; Kawano, Toshihiko; Stetcu, Ionel; Lestone, John Paul; McKigney, Edward Allen; Chadwick, Mark Benjamin

doi:10.1103/PhysRevC.94.064613

Late-time emission of prompt fission $γ$ rays

Journal Article · Thu Dec 22 00:00:00 EST 2016 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.94.064613· OSTI ID:1343702

Talou, Patrick ^[1]; Kawano, Toshihiko ^[1]; Stetcu, Ionel ^[1]; Lestone, John Paul ^[1]; McKigney, Edward Allen ^[1]; Chadwick, Mark Benjamin ^[1]

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

The emission of prompt fission γ rays within a few nanoseconds to a few microseconds following the scission point is studied in the Hauser-Feshbach formalism applied to the deexcitation of primary excited fission fragments. Neutron and γ-ray evaporations from fully accelerated fission fragments are calculated in competition at each stage of the decay, and the role of isomers in the fission products, before β decay, is analyzed. The time evolution of the average total γ-ray energy, the average total γ-ray multiplicity, and the fragment-specific γ-ray spectra is presented in the case of neutron-induced fission reactions of ²³⁵U and ²³⁹Pu, as well as spontaneous fission of ²⁵²Cf. The production of specific isomeric states is calculated and compared to available experimental data. About 7% of all prompt fission γ rays are predicted to be emitted between 10 ns and 5 μs following fission, in the case of ²³⁵U and ²³⁹Pu(_ⁿth,f) reactions, and up to 3% in the case of ²⁵²Cf spontaneous fission. The cumulative average total γ-ray energy increases by 2% to 5% in the same time interval. Lastly, those results are shown to be robust against significant changes in the model input parameters.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation; USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation (NA-20)

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1343702

Alternate ID(s):: OSTI ID: 1337442

Report Number(s):: LA-UR-16-24045

Journal Information:: Physical Review C, Journal Name: Physical Review C Journal Issue: 6 Vol. 94; ISSN PRVCAN; ISSN 2469-9985

Publisher:: APSCopyright Statement

Country of Publication:: United States

Language:: English

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Review on the progress in nuclear fission—experimental methods and theoretical descriptions Schmidt, Karl-Heinz; Jurado, Beatriz Reports on Progress in Physics, Vol. 81, Issue 10 https://doi.org/10.1088/1361-6633/aacfa7	journal	September 2018
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