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Title: Energy dependence of the prompt γ -ray emission from the ( d , p ) -induced fission of U * 234 and Pu * 240

Abstract

Prompt-fission γ rays are responsible for approximately 5% of the total energy released in fission, and therefore important to understand when modeling nuclear reactors. In this work we present prompt γ-ray emission characteristics in fission as a function of the nuclear excitation energy of the fissioning system. Emitted γ-ray spectra were measured, and γ-ray multiplicities and average and total γ energies per fission were determined for the 233U(d,pf) reaction for excitation energies between 4.8 and 10 MeV, and for the 239Pu(d,pf) reaction between 4.5 and 9 MeV. The spectral characteristics show no significant change as a function of excitation energy above the fission barrier, despite the fact that an extra ~5 MeV of energy is potentially available in the excited fragments for γ decay. The measured results are compared with model calculations made for prompt γ-ray emission with the fission model code gef. In conclusion, further comparison with previously obtained results from thermal neutron induced fission is made to characterize possible differences arising from using the surrogate (d,p) reaction.

Authors:
 [1];  [1];  [2];  [3];  [4];  [1];  [1];  [5];  [6];  [7];  [1];  [8];  [1];  [1];  [1];  [1];  [1];  [1];  [9];  [1] more »;  [1];  [1];  [10];  [1];  [11] « less
  1. Univ. of Oslo, Oslo (Norway)
  2. CNRS/Univ. Paris-Sud, Univ. Paris Saclay, Orsay Cedex (France)
  3. Extreme Light Infrastructure - Nuclear Physics (ELI-NP), Bucharest-Magurele (Romania)
  4. European Commission, Geel (Belgium)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
  6. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  7. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  8. Univ. of Oslo, Oslo (Norway); Helmholtz Institute Mainz, Mainz (Germany); GSI Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany)
  9. Univ. of California, Berkeley, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  10. Grand Accelerateur National d'lons Lourd (France)
  11. iThemba LABS, Somerset West (South Africa)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1378551
Alternate Identifier(s):
OSTI ID: 1368426; OSTI ID: 1429356
Report Number(s):
LLNL-JRNL-737322
Journal ID: ISSN 2469-9985; PRVCAN
Grant/Contract Number:
AC52-07NA27344; AC02-05CH11231
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 96; Journal Issue: 1; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Rose, Sunniva J., Zeiser, Fabio, Wilson, J. N., Oberstedt, A., Oberstedt, S., Siem, S., Tveten, G. M., Bernstein, L. A., Bleuel, D. L., Brown, J. A., Campo, L. Crespo, Giacoppo, F., Gorgen, A., Guttormsen, M., Hadynska, K., Hafreager, A., Hagen, T. W., Klintefjord, M., Laplace, T. A., Larsen, A. C., Renstrom, T., Sahin, E., Schmitt, C., Tornyi, T. G., and Wiedeking, M. Energy dependence of the prompt γ-ray emission from the (d,p)-induced fission of U*234 and Pu*240. United States: N. p., 2017. Web. doi:10.1103/PhysRevC.96.014601.
Rose, Sunniva J., Zeiser, Fabio, Wilson, J. N., Oberstedt, A., Oberstedt, S., Siem, S., Tveten, G. M., Bernstein, L. A., Bleuel, D. L., Brown, J. A., Campo, L. Crespo, Giacoppo, F., Gorgen, A., Guttormsen, M., Hadynska, K., Hafreager, A., Hagen, T. W., Klintefjord, M., Laplace, T. A., Larsen, A. C., Renstrom, T., Sahin, E., Schmitt, C., Tornyi, T. G., & Wiedeking, M. Energy dependence of the prompt γ-ray emission from the (d,p)-induced fission of U*234 and Pu*240. United States. doi:10.1103/PhysRevC.96.014601.
Rose, Sunniva J., Zeiser, Fabio, Wilson, J. N., Oberstedt, A., Oberstedt, S., Siem, S., Tveten, G. M., Bernstein, L. A., Bleuel, D. L., Brown, J. A., Campo, L. Crespo, Giacoppo, F., Gorgen, A., Guttormsen, M., Hadynska, K., Hafreager, A., Hagen, T. W., Klintefjord, M., Laplace, T. A., Larsen, A. C., Renstrom, T., Sahin, E., Schmitt, C., Tornyi, T. G., and Wiedeking, M. Wed . "Energy dependence of the prompt γ-ray emission from the (d,p)-induced fission of U*234 and Pu*240". United States. doi:10.1103/PhysRevC.96.014601.
@article{osti_1378551,
title = {Energy dependence of the prompt γ-ray emission from the (d,p)-induced fission of U*234 and Pu*240},
author = {Rose, Sunniva J. and Zeiser, Fabio and Wilson, J. N. and Oberstedt, A. and Oberstedt, S. and Siem, S. and Tveten, G. M. and Bernstein, L. A. and Bleuel, D. L. and Brown, J. A. and Campo, L. Crespo and Giacoppo, F. and Gorgen, A. and Guttormsen, M. and Hadynska, K. and Hafreager, A. and Hagen, T. W. and Klintefjord, M. and Laplace, T. A. and Larsen, A. C. and Renstrom, T. and Sahin, E. and Schmitt, C. and Tornyi, T. G. and Wiedeking, M.},
abstractNote = {Prompt-fission γ rays are responsible for approximately 5% of the total energy released in fission, and therefore important to understand when modeling nuclear reactors. In this work we present prompt γ-ray emission characteristics in fission as a function of the nuclear excitation energy of the fissioning system. Emitted γ-ray spectra were measured, and γ-ray multiplicities and average and total γ energies per fission were determined for the 233U(d,pf) reaction for excitation energies between 4.8 and 10 MeV, and for the 239Pu(d,pf) reaction between 4.5 and 9 MeV. The spectral characteristics show no significant change as a function of excitation energy above the fission barrier, despite the fact that an extra ~5 MeV of energy is potentially available in the excited fragments for γ decay. The measured results are compared with model calculations made for prompt γ-ray emission with the fission model code gef. In conclusion, further comparison with previously obtained results from thermal neutron induced fission is made to characterize possible differences arising from using the surrogate (d,p) reaction.},
doi = {10.1103/PhysRevC.96.014601},
journal = {Physical Review C},
number = 1,
volume = 96,
place = {United States},
year = {Wed Jul 05 00:00:00 EDT 2017},
month = {Wed Jul 05 00:00:00 EDT 2017}
}

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  • Cited by 1
  • Prompt-fission γ rays are responsible for approximately 5% of the total energy released in fission, and therefore important to understand when modeling nuclear reactors. In this work we present prompt γ-ray emission characteristics in fission as a function of the nuclear excitation energy of the fissioning system. Emitted γ-ray spectra were measured, and γ-ray multiplicities and average and total γ energies per fission were determined for the U(d,pf)233 reaction for excitation energies between 4.8 and 10 MeV, and for the Pu(d,pf)239 reaction between 4.5 and 9 MeV. The spectral characteristics show no significant change as a function of excitation energymore » above the fission barrier, despite the fact that an extra -5 MeV of energy is potentially available in the excited fragments for γ decay. The measured results are compared with model calculations made for prompt γ-ray emission with the fission model code gef. Further comparison with previously obtained results from thermal neutron induced fission is made to characterize possible differences arising from using the surrogate (d,p) reaction.« less
    Cited by 1
  • The Pu 236(n,f), Pu 237(n,f) and Pu 238(n,f) cross sections have been inferred by utilizing the surrogate ratio method. Targets of Pu 239 and U 235 were bombarded with 28.5-MeV protons, and the light ion recoils, as well as fission fragments, were detected using the STARS detector array at the K150 Cyclotron at the Texas A&M cyclotron facility. The (p, tf) reaction on Pu 239 and U 235 targets was used to deduce the σ (Pu 236(n,f))/σ(U 232(n,f)) ratio, and the Pu 236(n,f) cross section was subsequently determined for En=0.5–7.5 MeV. Similarly, the (p,df) reaction on the same two targetsmore » was used to deduce the σ(Pu 237(n,f))/σ(U 233(n,f)) ratio, and the Pu 237(n,f) cross section was extracted in the energy range En=0.5–7 MeV. The Pu 238(n,f) cross section was also deduced by utilizing the (p,p') reaction channel on the same targets. There is good agreement with the recent ENDF/B-VII.1 evaluated cross section data for Pu 238(n,f) in the range En=0.5–10.5 MeV and for Pu 237(n,f) in the range En=0.5–7 MeV; however, the Pu 236(n,f) cross section deduced in the present work is higher than the evaluation between 2 and 7 MeV.« less
  • Cited by 1
  • Using dual-fission chambers each loaded with a thick (200–400–mg/cm 2) actinide target of 235,238U or 239Pu and two thin (~10–100–μg/cm 2) reference foils of the same actinide, the cumulative yields of fission products ranging from 92Sr to 147Nd have been measured at E n = 8.9MeV. The 2H(d,n) 3He reaction provided the quasimonoenergetic neutron beam. Here, the experimental setup and methods used to determine the fission product yield (FPY) are described, and results for typically eight high-yield fission products are presented.