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Title: Inspection of 56Fe γ-Ray angular distributions as a function of incident neutron energy using optical model approaches

Neutron inelastic scattering cross sections measured directly through (n,n) or deduced from g-ray production cross sections following inelastic neutron scattering (n,n0) are a focus of basic and applied research at the University of Kentucky Accelerator Laboratory (www.pa.uky.edu/accelerator). For nuclear data applications, angle-integrated cross sections are desired over a wide range of fast neutron energies. Several days of experimental beam time are required for a data set at each incident neutron energy, which limits the number of angular distributions that can be measured in a reasonable amount of time. Approximations can be employed to generate cross sections with a higher energy resolution, since at 125°, the a 2P 2 term of the Legendre expansion is identically zero and the a 4P 4 is assumed to be very small. Provided this assumption is true, a single measurement at 125o would produce the g-ray production cross section. Finally, this project tests these assumptions and energy dependences using the codes CINDY/SCAT and TALYS/ECIS06/SCAT. It is found that care must be taken when interpreting g-ray excitation functions as cross sections when the incident neutron energy is <1000 keV above threshold or before the onset of feeding.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [2] ;  [2] ;  [2] ;  [5]
  1. U.S. Naval Academy, Annapolis, MD (United States). Dept. of Physics; Univ. of Dallas, Irving, TX (United States). Dept. of Physics
  2. Univ. of Kentucky, Lexington, KY (United States). Dept. of Chemistry
  3. U.S. Naval Academy, Annapolis, MD (United States). Dept. of Physics
  4. Univ. of Dallas, Irving, TX (United States). Dept. of Physics
  5. Univ. of Kentucky, Lexington, KY (United States). Dept. of Chemistry; Univ. of Kentucky, Lexington, KY (United States). Dept. of Physics & Astronomy
Publication Date:
Grant/Contract Number:
NA0002931
Type:
Accepted Manuscript
Journal Name:
EPJ Web of Conferences
Additional Journal Information:
Journal Volume: 146; Conference: ND2016 International Conference on Nuclear Data for Science and Technology, Bruges (Belgium), 11-16 Sep 2016; Journal ID: ISSN 2100-014X
Publisher:
EDP Sciences
Research Org:
Univ. of Kentucky, Lexington, KY (United States). Research Foundation
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Gamma-ray angular distributions; Neutron inelastic cross sections
OSTI Identifier:
1415234