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Title: Pu 236 ( n , f ) , Pu 237 ( n , f ) , and Pu 238 ( n , f ) cross sections deduced from ( p , t ) , ( p , d ) , and ( p , p ' ) surrogate reactions

Abstract

The Pu236(n,f), Pu237(n,f) and Pu238(n,f) cross sections have been inferred by utilizing the surrogate ratio method. Targets of Pu239 and U235 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 Pu239 and U235 targets was used to deduce the σ (Pu236(n,f))/σ(U232(n,f)) ratio, and the Pu236(n,f) cross section was subsequently determined for En=0.5–7.5 MeV. Similarly, the (p,df) reaction on the same two targets was used to deduce the σ(Pu237(n,f))/σ(U233(n,f)) ratio, and the Pu237(n,f) cross section was extracted in the energy range En=0.5–7 MeV. The Pu238(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 Pu238(n,f) in the range En=0.5–10.5 MeV and for Pu237(n,f) in the range En=0.5–7 MeV; however, the Pu236(n,f) cross section deduced in the present work is higher than the evaluation between 2 and 7 MeV.

Authors:
 [1];  [1];  [1];  [2];  [2];  [3];  [2];  [1];  [1];  [3];  [4];  [4];  [1];  [2]
  1. Univ. of Richmond, VA (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Yale Univ., New Haven, CT (United States)
  4. Texas A & M Univ., College Station, TX (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1229800
Report Number(s):
LLNL-JRNL-647733
Journal ID: ISSN 0556-2813; PRVCAN
DOE Contract Number:  
AC52-07NA27344
Resource Type:
Journal Article
Journal Name:
Physical Review C, Nuclear Physics
Additional Journal Information:
Journal Volume: 90; Journal Issue: 1; Journal ID: ISSN 0556-2813
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Hughes, R. O., Beausang, C. W., Ross, T. J., Burke, J. T., Casperson, R. J., Cooper, N., Escher, J. E., Gell, K., Good, E., Humby, P., McCleskey, M., Saastimoinen, A., Tarlow, T. D., and Thompson, I. J. Pu236(n,f) , Pu237(n,f) , and Pu238(n,f) cross sections deduced from (p,t) , (p,d) , and (p,p') surrogate reactions. United States: N. p., 2014. Web. doi:10.1103/PhysRevC.90.014304.
Hughes, R. O., Beausang, C. W., Ross, T. J., Burke, J. T., Casperson, R. J., Cooper, N., Escher, J. E., Gell, K., Good, E., Humby, P., McCleskey, M., Saastimoinen, A., Tarlow, T. D., & Thompson, I. J. Pu236(n,f) , Pu237(n,f) , and Pu238(n,f) cross sections deduced from (p,t) , (p,d) , and (p,p') surrogate reactions. United States. https://doi.org/10.1103/PhysRevC.90.014304
Hughes, R. O., Beausang, C. W., Ross, T. J., Burke, J. T., Casperson, R. J., Cooper, N., Escher, J. E., Gell, K., Good, E., Humby, P., McCleskey, M., Saastimoinen, A., Tarlow, T. D., and Thompson, I. J. 2014. "Pu236(n,f) , Pu237(n,f) , and Pu238(n,f) cross sections deduced from (p,t) , (p,d) , and (p,p') surrogate reactions". United States. https://doi.org/10.1103/PhysRevC.90.014304. https://www.osti.gov/servlets/purl/1229800.
@article{osti_1229800,
title = {Pu236(n,f) , Pu237(n,f) , and Pu238(n,f) cross sections deduced from (p,t) , (p,d) , and (p,p') surrogate reactions},
author = {Hughes, R. O. and Beausang, C. W. and Ross, T. J. and Burke, J. T. and Casperson, R. J. and Cooper, N. and Escher, J. E. and Gell, K. and Good, E. and Humby, P. and McCleskey, M. and Saastimoinen, A. and Tarlow, T. D. and Thompson, I. J.},
abstractNote = {The Pu236(n,f), Pu237(n,f) and Pu238(n,f) cross sections have been inferred by utilizing the surrogate ratio method. Targets of Pu239 and U235 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 Pu239 and U235 targets was used to deduce the σ (Pu236(n,f))/σ(U232(n,f)) ratio, and the Pu236(n,f) cross section was subsequently determined for En=0.5–7.5 MeV. Similarly, the (p,df) reaction on the same two targets was used to deduce the σ(Pu237(n,f))/σ(U233(n,f)) ratio, and the Pu237(n,f) cross section was extracted in the energy range En=0.5–7 MeV. The Pu238(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 Pu238(n,f) in the range En=0.5–10.5 MeV and for Pu237(n,f) in the range En=0.5–7 MeV; however, the Pu236(n,f) cross section deduced in the present work is higher than the evaluation between 2 and 7 MeV.},
doi = {10.1103/PhysRevC.90.014304},
url = {https://www.osti.gov/biblio/1229800}, journal = {Physical Review C, Nuclear Physics},
issn = {0556-2813},
number = 1,
volume = 90,
place = {United States},
year = {2014},
month = {7}
}

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The Inelastic Scattering of Neutrons
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The Ame2003 atomic mass evaluation
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