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A new 9Be(alpha,n) cross-section evaluation for use in the SOURCES computer code.

E F Shores1, G E Mueller, G A Schlapper

  • 1Department of Nuclear Engineering, University of Missouri-Rolla, Rolla, MO 65401, USA. eshores@lanl.gov

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|August 28, 2003
PubMed
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Researchers optimized alpha optical potential parameters for nuclear reaction calculations. New branching fractions improve neutron source code (SOURCES) simulations, showing promising results for future research.

Area of Science:

  • Nuclear Physics
  • Computational Physics

Background:

  • Accurate nuclear reaction modeling is crucial for understanding nuclear processes.
  • Existing models require refinement for specific reactions like 9Be(alpha,alpha'n).

Purpose of the Study:

  • To determine optimal alpha optical potential parameters for the 9Be(alpha,alpha'n) reaction.
  • To improve the accuracy of neutron source simulations using the SOURCES code system.

Main Methods:

  • Utilized experimental breakup reaction data to select alpha optical potential parameters.
  • Employed the GNASH code for cross-section calculations.
  • Developed an approximation for three-body reaction branching fractions.
  • Validated the updated SOURCES code against experimental and simulated neutron spectra.

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Main Results:

  • Selected alpha optical potential parameters provided promising, though not perfect, agreement with experimental data.
  • The approximation for branching fractions served as a temporary solution for SOURCES code modifications.
  • Comparison of experimental and simulated spectra validated the new version of the SOURCES code.

Conclusions:

  • Continued research is needed to find optimal alpha optical potential parameters.
  • The improved SOURCES code, with new branching fractions, shows potential for more accurate neutron source simulations.
  • The study provides a benchmark for future validation of nuclear data and simulation codes.