skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

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

Abstract

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:
Research Org.:
Univ. of Kentucky, Lexington, KY (United States). Research Foundation
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1415234
Grant/Contract Number:  
NA0002931
Resource Type:
Journal Article: 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
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Gamma-ray angular distributions; Neutron inelastic cross sections

Citation Formats

Vanhoy, J. R., Ramirez, A. P., Alcorn-Dominguez, D. K., Hicks, S. F., Peters, E. E., McEllistrem, M. T., Mukhopadhyay, S., and Yates, S. W. Inspection of 56Fe γ-Ray angular distributions as a function of incident neutron energy using optical model approaches. United States: N. p., 2017. Web. doi:10.1051/epjconf/201714611051.
Vanhoy, J. R., Ramirez, A. P., Alcorn-Dominguez, D. K., Hicks, S. F., Peters, E. E., McEllistrem, M. T., Mukhopadhyay, S., & Yates, S. W. Inspection of 56Fe γ-Ray angular distributions as a function of incident neutron energy using optical model approaches. United States. doi:10.1051/epjconf/201714611051.
Vanhoy, J. R., Ramirez, A. P., Alcorn-Dominguez, D. K., Hicks, S. F., Peters, E. E., McEllistrem, M. T., Mukhopadhyay, S., and Yates, S. W. Wed . "Inspection of 56Fe γ-Ray angular distributions as a function of incident neutron energy using optical model approaches". United States. doi:10.1051/epjconf/201714611051. https://www.osti.gov/servlets/purl/1415234.
@article{osti_1415234,
title = {Inspection of 56Fe γ-Ray angular distributions as a function of incident neutron energy using optical model approaches},
author = {Vanhoy, J. R. and Ramirez, A. P. and Alcorn-Dominguez, D. K. and Hicks, S. F. and Peters, E. E. and McEllistrem, M. T. and Mukhopadhyay, S. and Yates, S. W.},
abstractNote = {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 a2P2 term of the Legendre expansion is identically zero and the a4P4 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.},
doi = {10.1051/epjconf/201714611051},
journal = {EPJ Web of Conferences},
number = ,
volume = 146,
place = {United States},
year = {Wed Sep 13 00:00:00 EDT 2017},
month = {Wed Sep 13 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Save / Share: