Using anisotropies in prompt fission neutron coincidences to assess the neutron multiplication of highly multiplying subcritical plutonium assemblies
Abstract
There is a significant and well-known anisotropy between the prompt neutrons emitted from a single fission event; these neutrons are most likely to be observed at angles near 0° or 180° relative to each other. However, the propagation of this anisotropy through different generations of a fission chain re-action has not been previously studied. We have measured this anisotropy in neutron–neutron coincidences from a subcritical highly-multiplying assembly of plutonium metal. The assembly was a 4.5 kg α-phase plutonium metal sphere composed of 94% 239Pu and 6% 240Pu by mass. Data were collected using two EJ-309 liquid scintillators and two EJ-299 plastic scintillators. The angular distribution of neutron–neutron coincidences was measured at 90° and 180° and found to be largely isotropic. Simulations were performed using MCNPX-PoliMi of similar plutonium metal spheres of varying sizes and a correlation between the neutron multiplication of the assembly and the anisotropy of neutron–neutron coincidences was observed. In principle, this correlation could be used to assess the neutron multi-plication of an unknown assembly.
- Authors:
-
- North Carolina State University, Raleigh, NC (United States)
- Publication Date:
- Research Org.:
- North Carolina State University, Raleigh, NC (United States); Univ. of Michigan, Ann Arbor, MI (United States); CNEC/North Carolina State University, Raleigh, NC (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation
- OSTI Identifier:
- 1438391
- Alternate Identifier(s):
- OSTI ID: 1359655; OSTI ID: 1367549; OSTI ID: 1437438; OSTI ID: 1487109
- Grant/Contract Number:
- NA0002576; NA0002534
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
- Additional Journal Information:
- Journal Volume: 825; Journal Issue: C; Journal ID: ISSN 0168-9002
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; passive interrogation; plutonium; nonproliferation; special nuclear material; neutron angular anisotropy; neutron detectors
Citation Formats
Mueller, Jonathan M., and Mattingly, J. Using anisotropies in prompt fission neutron coincidences to assess the neutron multiplication of highly multiplying subcritical plutonium assemblies. United States: N. p., 2016.
Web. doi:10.1016/j.nima.2016.04.027.
Mueller, Jonathan M., & Mattingly, J. Using anisotropies in prompt fission neutron coincidences to assess the neutron multiplication of highly multiplying subcritical plutonium assemblies. United States. https://doi.org/10.1016/j.nima.2016.04.027
Mueller, Jonathan M., and Mattingly, J. Sat .
"Using anisotropies in prompt fission neutron coincidences to assess the neutron multiplication of highly multiplying subcritical plutonium assemblies". United States. https://doi.org/10.1016/j.nima.2016.04.027. https://www.osti.gov/servlets/purl/1438391.
@article{osti_1438391,
title = {Using anisotropies in prompt fission neutron coincidences to assess the neutron multiplication of highly multiplying subcritical plutonium assemblies},
author = {Mueller, Jonathan M. and Mattingly, J.},
abstractNote = {There is a significant and well-known anisotropy between the prompt neutrons emitted from a single fission event; these neutrons are most likely to be observed at angles near 0° or 180° relative to each other. However, the propagation of this anisotropy through different generations of a fission chain re-action has not been previously studied. We have measured this anisotropy in neutron–neutron coincidences from a subcritical highly-multiplying assembly of plutonium metal. The assembly was a 4.5 kg α-phase plutonium metal sphere composed of 94% 239Pu and 6% 240Pu by mass. Data were collected using two EJ-309 liquid scintillators and two EJ-299 plastic scintillators. The angular distribution of neutron–neutron coincidences was measured at 90° and 180° and found to be largely isotropic. Simulations were performed using MCNPX-PoliMi of similar plutonium metal spheres of varying sizes and a correlation between the neutron multiplication of the assembly and the anisotropy of neutron–neutron coincidences was observed. In principle, this correlation could be used to assess the neutron multi-plication of an unknown assembly.},
doi = {10.1016/j.nima.2016.04.027},
journal = {Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment},
number = C,
volume = 825,
place = {United States},
year = {Sat Apr 09 00:00:00 EDT 2016},
month = {Sat Apr 09 00:00:00 EDT 2016}
}
Web of Science
Figures / Tables:
Works referenced in this record:
Calculation of fission observables through event-by-event simulation
journal, August 2009
- Randrup, Jørgen; Vogt, Ramona
- Physical Review C, Vol. 80, Issue 2
The Energy Dependence of Fission Fragment Anisotropy in Fast-Neutron-Induced Fission of Uranium-235
journal, August 1979
- Ahmad, S.; Islam, M. M.; Khan, A. H.
- Nuclear Science and Engineering, Vol. 71, Issue 2
Neutron-neutron angular correlations in spontaneous fission of 252Cf
journal, June 2008
- Gagarski, A. M.; Guseva, I. S.; Sokolov, V. E.
- Bulletin of the Russian Academy of Sciences: Physics, Vol. 72, Issue 6
Measurements of angular and energy distributions of prompt neutrons from thermal neutron-induced fission
journal, January 2009
- Vorobyev, A. S.; Shcherbakov, O. A.; Pleva, Yu. S.
- Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 598, Issue 3
New Standard Evaluated Neutron Cross Section Libraries for the GEANT4 Code and First Verification
journal, August 2014
- Mendoza, Emilio; Cano-Ott, Daniel; Koi, Tatsumi
- IEEE Transactions on Nuclear Science, Vol. 61, Issue 4
Geant4 developments and applications
journal, February 2006
- Allison, J.; Amako, K.; Apostolakis, J.
- IEEE Transactions on Nuclear Science, Vol. 53, Issue 1
A zero-knowledge protocol for nuclear warhead verification
journal, June 2014
- Glaser, Alexander; Barak, Boaz; Goldston, Robert J.
- Nature, Vol. 510, Issue 7506
Neutron response characterization for an EJ299-33 plastic scintillation detector
journal, September 2014
- Lawrence, Chris C.; Febbraro, Michael; Massey, Thomas N.
- Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 759
MCNP-PoliMi: a Monte-Carlo code for correlation measurements
journal, November 2003
- Pozzi, Sara A.; Padovani, Enrico; Marseguerra, Marzio
- Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 513, Issue 3
Angular correlation of neutrons from thermal-neutron fission of 235U
journal, October 1978
- Franklyn, C. B.; Hofmeyer, C.; Mingay, D. W.
- Physics Letters B, Vol. 78, Issue 5
Polyethylene-reflected plutonium metal sphere : subcritical neutron and gamma measurements.
report, November 2009
- Mattingly, John K.
Models for a three-parameter analysis of neutron signal correlation measurements for fissile material assay
journal, November 1986
- Cifarelli, D. M.; Hage, W.
- Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 251, Issue 3
Angular Distribution of Fragments in Fission Induced by Mev Neutrons
journal, October 1960
- Simmons, J. E.; Henkel, R. L.
- Physical Review, Vol. 120, Issue 1
Pulse shape discrimination in inorganic and organic scintillators. I
journal, August 1971
- Winyard, R. A.; Lutkin, J. E.; McBeth, G. W.
- Nuclear Instruments and Methods, Vol. 95, Issue 1, p. 141-153
Neutron angular correlations in spontaneous and neutron-induced fission
journal, December 2014
- Vogt, R.; Randrup, J.
- Physical Review C, Vol. 90, Issue 6
Using neutron angular anisotropy information to dynamically determine the ratio of the (α,n) rate to spontaneous fission rate for coincidence counting applications
journal, February 2013
- Holewa, L.; Charlton, W.; Miller, E.
- Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 701
Angular Correlation of Neutrons from Spontaneous Fission of
journal, December 1975
- Pringle, J. S.; Brooks, F. D.
- Physical Review Letters, Vol. 35, Issue 23
Angular Dependence of Coincidences between Fission Neutrons
journal, December 1948
- Debenedetti, S.; Francis, J. E.; Preston, W. M.
- Physical Review, Vol. 74, Issue 11
Correlated Neutron Emissions from 252 Cf
journal, October 2014
- Pozzi, Sara A.; Wieger, Brian; Enqvist, Andreas
- Nuclear Science and Engineering, Vol. 178, Issue 2
Gamma-calibration of NE 213 scintillation counters
journal, March 1982
- Dietze, G.; Klein, H.
- Nuclear Instruments and Methods in Physics Research, Vol. 193, Issue 3
Works referencing / citing this record:
High resolution measurement of tagged two-neutron energy and angle correlations in (sf)
journal, July 2019
- Schuster, P. F.; Marcath, M. J.; Marin, S.
- Physical Review C, Vol. 100, Issue 1
Figures / Tables found in this record: