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New prompt fission neutron spectra measurements in the 238 U(n,f) reaction with a dedicated setup at LANSCE/WNR

Journal Article · · EPJ Web of Conferences
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  1. Alternative Energies and Atomic Energy Commission (CEA), Arpajon (France). Directorate of Military Applications (DAM)
  2. Univ. de Caen, Caen (France). Lab. de Physique Corpusculaire de Caen, ENSICAEN
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
+ Show Author Affiliations
A new prompt fission neutron spectra (PFNS) measurement in the 238U(n,f) reaction was performed at LANSCE/WNR facility. Evaluated data show discrepancies on the low (below 1 MeV) and high (above 5 MeV) energy parts in the PFNS for different major and minor actinides. The goal is to improve these measurements in a wide range of incident energy. The energy of the incoming neutron, inducing the fission, and the prompt neutron energies, are measured by time-of-flight method. A dedicated fission chamber was developed, in order to improve alpha-fission discrimination, timing resolution, actinide mass, and to reduce the amount of neutron scattering. To detect prompt neutrons, the 54 Chi-Nu scintillator cells array were surrounding the fission chamber. High statistics were recorded during this experiment, allowing a precise study of PFNS behavior as a function of incident neutron energy, from 1 MeV to 200 MeV. In conclusion, this experiment also showed that all the new tools developed to improve PFNS measurements are performing. Therefore, measurements of PFNS with others actinides such as 239Pu are planned.
Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA). Office of Defense Programs (DP) (NA-10)
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1463567
Report Number(s):
LA-UR--18-25951
Journal Information:
EPJ Web of Conferences, Journal Name: EPJ Web of Conferences Vol. 146; ISSN 2100-014X
Publisher:
EDP SciencesCopyright Statement
Country of Publication:
United States
Language:
English

References (8)

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journal June 2006
p-Terphenyl: An alternative to liquid scintillators for neutron detection
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journal August 2015
A new fission chamber dedicated to Prompt Fission Neutron Spectra measurements
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journal October 2016
Prompt-fission-neutron average energy for 238U(n,f) from threshold to 200 MeV journal November 2003
Measurement of prompt neutron spectra from the 239 Pu( n , f ) fission reaction for incident neutron energies from 1 to 200 MeV journal January 2014
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