Utilizing (p,d) and (p,t) reactions to obtain (n,f) cross sections in uranium nuclei via the surrogate-ratio method

R. O. Hughes, C. W. Beausang, T. J. Ross, J. T. Harke, N. D. Scielzo, M. S. Basunia, C. M. Campbell, R. J. Casperson, H. L. Crawford, J. E. Escher, J. Munson, L. W. Phair, and J. J. Ressler
Phys. Rev. C 85, 024613 – Published 21 February 2012

Abstract

The surrogate ratio method has been tested for (p,d) and (p,t) reactions on uranium nuclei. 236U and 238U targets were bombarded with 28-MeV protons and the light ion recoils and fission fragments were detected using the Silicon Telescope Array for Reaction Studies detector array at the 88-Inch Cyclotron at Lawrence Berkeley National Laboratory. The (p,df) reaction channels on 236U and 238U targets were used as a surrogate to determine the σ[236U(n,f)]/σ[234U(n,f)] cross-section ratio. The (p,tf) reaction channels were also measured with the same targets as a surrogate for the σ[235U(n,f)]/σ[(233U(n,f)] ratio. For the (p,df) and (p,tf) surrogate measurements, there is good agreement with accepted (n,f) values over equivalent neutron energy ranges of En=0–7 MeV and En=0–5.5 MeV, respectively. An internal surrogate ratio method comparing the (p,d) and (p,t) reaction channels on a single target is also discussed. The σ[234U(n,f)]/σ[233U(n,f)] and σ[236U(n,f)]/σ[235U(n,f)] cross-section ratios are extracted using this method for the 236U and 238U targets, respectively. The resulting fission cross-section ratios show relatively good agreement with accepted values up to En5 MeV.

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  • Received 20 December 2011

DOI:https://doi.org/10.1103/PhysRevC.85.024613

©2012 American Physical Society

Authors & Affiliations

R. O. Hughes1,*, C. W. Beausang1, T. J. Ross1,4, J. T. Harke2, N. D. Scielzo2, M. S. Basunia3, C. M. Campbell3, R. J. Casperson2, H. L. Crawford3, J. E. Escher2, J. Munson3, L. W. Phair3, and J. J. Ressler2

  • 1Department of Physics, University of Richmond, 28 Westhampton Way, Richmond, Virginia 23173, USA
  • 2Lawrence Livermore National Laboratory, Livermore, California 94551, USA
  • 3Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 4Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom

  • *rhughes2@richmond.edu

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Vol. 85, Iss. 2 — February 2012

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