Novel Cross Section Measurements through Absolute High-Precision Cold Neutron Fluence Determination

ORAL

Abstract

The National Institute of Standards and Technology has developed an instrument (Alpha-Gamma) that utilizes the interaction of neutrons with a totally absorbing 10B target to precisely measure the flux of a well-collimated monochromatic neutron beam. This measurement provides a calibration of the 6Li (n,alpha) 3H based flux monitor used in the NIST beam-based neutron lifetime experiment to better than 0.1 {\%} and is now being utilized in novel, 0.2 {\%} level, measurements of the 235U neutron-induced fission and 6Li cross sections.~ These ancillary measurements will provide systematically independent determinations of these important quantities. The results of recent and ongoing measurements will be presented, and planned operations will be discussed.

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Authors

  • Hans Mumm

    • National Institute of Standards and Technology

  • E. Adamek

    • University of Hawaii

  • J. Caylor

    • University of Tennessee

  • M. Dewey

    • National Institute of Standards and Technology

  • C. Haddock

    • National Institute of Standards and Technology

  • D. Gilliam

    • Retired

  • E. Pirovano

    • Physikalisch-Technische Bundesanstalt

  • E. Scott

    • National Institute of Standards and Technology