Arzu Alpan

Pennsylvania State University

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Apisit Patchimpattapong

Electricity Generating Authority of Thailand

Shane R. Gardner

Pennsylvania State University

Vefa Kucukboyaci

Westinghouse Electric (Japan)

T. N. Massey

Ohio University

Alireza Haghighat

Virginia Tech

James M. Adams

National Institute of Standards and Technology

A.D. Carlson

Brookhaven National Laboratory

Michael T. Wenner

University of Florida

S. M. Grimes

Ohio University

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Pennsylvania State University

University of Florida

Lawrence Livermore National Laboratory

National Institute of Standards and Technology

Ohio University

University of Notre Dame

Fraunhofer Institute for Telecommunications, Heinrich Hertz Institute

NIST Center for Neutron Research

National Institute of Standards

Electricity Generating Authority of Thailand

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A New Investigation of Iron Cross Sections via Spherical-Shell Transmission Measurements and Particle Transport Calculations

Journal of Nuclear Science and Technology (2002)

James M. Adams Arzu Alpan A.D. Carlson Shane R. Gardner S. M. Grimes

We are engaged in a multi-year project to study neutron scattering interactions in iron, the principal objective of which is to investigate the well-known deficiency that exists in reactor pressure vessel neutron fluence determinations. Specifically, we are using the spherical-shell transmission method, employing iron shells with different thicknesses, and neutron time-of-flight measurements of the scattered neutrons, in an effort to precisely determine specific energy regions over which deficiencies in the non-elastic scattering cross section for neutron scattering in iron appear to exist. The analysis of the experimental data involves correlating the data with theoretical calculations of neutron transport through the iron spheres in order to evaluate the degree to which the calculated neutron spectra predict the measured spectra relative to different types of particle interactions. In doing so, we have developed new methodologies for performing neutron transport calculations that will be useful to a range of transport problems. Preliminary results show good agreement between the experimental data and the calculated distribution of neutron flight times over much of the data range, except for the contribution due to breakup neutrons.

Neutron Transport

10.1080/00223131.2002.10875242

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