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Title: Measurements of the Prompt Fission Neutron Spectrum at LANSCE: The Chi-Nu Experiment

Abstract

The goal of the Chi-Nu experiment at the Los Alamos Neutron Science Center is to measure the prompt fission neutron spectra from major actinides using a double time-of-flight method with a pulsed, white incoming neutron source. Fission events are detected with a parallel-plate avalanche counter and outgoing neutrons are detected with either a 6Li-glass or liquid scintillator detector array for low- or high-energy neutrons, respectively. A detector response matrix for the interaction of neutrons with the experimental environment for neutrons measured with the Chi-Nu 6Li-glass detector array has been calculated to obtain a full understanding of the measured Chi-Nu data and also to allow for nearly instantaneous production of simulated Chi-Nu data spectra. Prompt fission neutron spectra corresponding to 19 incoming neutron energy ranges from 0.7-20 MeV have been extracted using the ratio-of-ratios method with Chi-Nu 6Li-glass data on the neutron-induced fission of 235U.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [1];  [1];  [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [1];  [2];  [2];  [2];  [2]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1485387
Report Number(s):
LA-UR-17-24604
Journal ID: ISSN 2100-014X
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
EPJ Web of Conferences
Additional Journal Information:
Journal Volume: 193; Conference: 6th Workshop on Nuclear Fission and Spectroscopy of Neutron-Rich Nuclei, Chamrousse (France), 20-24 Mar 2017; Journal ID: ISSN 2100-014X
Publisher:
EDP Sciences
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY

Citation Formats

Kelly, Keegan John, Devlin, Matthew James, Gomez, Jaime A., O'Donnell, John M., Taddeucci, Terry Nicholas, Haight, Robert Cameron, Lee, Hye Young, Mosby, Shea Morgan, Fotiadis, Nikolaos, Neudecker, Denise, Talou, Patrick, Rising, Michael Evan, White, Morgan Curtis, Solomon, Clell Jeffrey Jr., Wu, Ching-Yen, Bucher, Brian Michael, Buckner, Matthew Quinn, and Henderson, Roger Alan. Measurements of the Prompt Fission Neutron Spectrum at LANSCE: The Chi-Nu Experiment. United States: N. p., 2018. Web. doi:10.1051/epjconf/201819303003.
Kelly, Keegan John, Devlin, Matthew James, Gomez, Jaime A., O'Donnell, John M., Taddeucci, Terry Nicholas, Haight, Robert Cameron, Lee, Hye Young, Mosby, Shea Morgan, Fotiadis, Nikolaos, Neudecker, Denise, Talou, Patrick, Rising, Michael Evan, White, Morgan Curtis, Solomon, Clell Jeffrey Jr., Wu, Ching-Yen, Bucher, Brian Michael, Buckner, Matthew Quinn, & Henderson, Roger Alan. Measurements of the Prompt Fission Neutron Spectrum at LANSCE: The Chi-Nu Experiment. United States. doi:10.1051/epjconf/201819303003.
Kelly, Keegan John, Devlin, Matthew James, Gomez, Jaime A., O'Donnell, John M., Taddeucci, Terry Nicholas, Haight, Robert Cameron, Lee, Hye Young, Mosby, Shea Morgan, Fotiadis, Nikolaos, Neudecker, Denise, Talou, Patrick, Rising, Michael Evan, White, Morgan Curtis, Solomon, Clell Jeffrey Jr., Wu, Ching-Yen, Bucher, Brian Michael, Buckner, Matthew Quinn, and Henderson, Roger Alan. Wed . "Measurements of the Prompt Fission Neutron Spectrum at LANSCE: The Chi-Nu Experiment". United States. doi:10.1051/epjconf/201819303003. https://www.osti.gov/servlets/purl/1485387.
@article{osti_1485387,
title = {Measurements of the Prompt Fission Neutron Spectrum at LANSCE: The Chi-Nu Experiment},
author = {Kelly, Keegan John and Devlin, Matthew James and Gomez, Jaime A. and O'Donnell, John M. and Taddeucci, Terry Nicholas and Haight, Robert Cameron and Lee, Hye Young and Mosby, Shea Morgan and Fotiadis, Nikolaos and Neudecker, Denise and Talou, Patrick and Rising, Michael Evan and White, Morgan Curtis and Solomon, Clell Jeffrey Jr. and Wu, Ching-Yen and Bucher, Brian Michael and Buckner, Matthew Quinn and Henderson, Roger Alan},
abstractNote = {The goal of the Chi-Nu experiment at the Los Alamos Neutron Science Center is to measure the prompt fission neutron spectra from major actinides using a double time-of-flight method with a pulsed, white incoming neutron source. Fission events are detected with a parallel-plate avalanche counter and outgoing neutrons are detected with either a 6Li-glass or liquid scintillator detector array for low- or high-energy neutrons, respectively. A detector response matrix for the interaction of neutrons with the experimental environment for neutrons measured with the Chi-Nu 6Li-glass detector array has been calculated to obtain a full understanding of the measured Chi-Nu data and also to allow for nearly instantaneous production of simulated Chi-Nu data spectra. Prompt fission neutron spectra corresponding to 19 incoming neutron energy ranges from 0.7-20 MeV have been extracted using the ratio-of-ratios method with Chi-Nu 6Li-glass data on the neutron-induced fission of 235U.},
doi = {10.1051/epjconf/201819303003},
journal = {EPJ Web of Conferences},
number = ,
volume = 193,
place = {United States},
year = {2018},
month = {11}
}

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

Figures / Tables:

Figure 1 Figure 1: An example 6Li-glass spectrum as a function of Et , the energy determined from the neutron time of flight. These data correspond to prompt fission neutrons emitted from the neutron-induced fission of 235U for an incoming neutron energy range of 1.0 MeV ≤ E$inc\atop{n}$ ≤ 1.5 MeV. Themore » data are shown as the blue circles. Additionally, the convolution of the ENDF/B-VII.1 6Li(n,α)t cross section with a PFNS known to approximately describe the displayed data is shown as the red, solid line. This line represents the expected counts from an “ideal” detector.« less

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Works referenced in this record:

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journal, January 2015


Numerical integration of detector response functions via Monte Carlo simulations
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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.