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Title: Detection of special nuclear material from delayed neutron emission induced by a dual-particle monoenergetic source

Detection of unique signatures of special nuclear materials is critical for their interdiction in a variety of nuclear security and nonproliferation scenarios. We report on the observation of delayed neutrons from fission of uranium induced in dual-particle active interrogation based on the 11B(d,n γ) 12C nuclear reaction. Majority of the fissions are attributed to fast fission induced by the incident quasi-monoenergetic neutrons. A Li-doped glass–polymer composite scintillation neutron detector, which displays excellent neutron/γ discrimination at low energies, was used in the measurements, along with a recoil-based liquid scintillation detector. Time- dependent buildup and decay of delayed neutron emission from 238U were measured between the interrogating beam pulses and after the interrogating beam was turned off, respectively. Characteristic buildup and decay time profiles were compared to the common parametrization into six delayed neutron groups, finding a good agreement between the measurement and nuclear data. Furthermore, this method is promising for detecting fissile and fissionable materials in cargo scanning applications and can be readily integrated with transmission radiography using low-energy nuclear reaction sources.
Authors:
ORCiD logo [1] ;  [2] ;  [2]
  1. The Pennsylvania State Univ., University Park, PA (United States); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  2. Univ. of Michigan, Ann Arbor, MI (United States)
Publication Date:
Report Number(s):
PNNL-SA-119002
Journal ID: ISSN 0003-6951
Grant/Contract Number:
AC05-76RL01830
Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 108; Journal Issue: 26; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Research Org:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
OSTI Identifier:
1282478

Mayer, Michael F., Nattress, J., and Jovanovic, I.. Detection of special nuclear material from delayed neutron emission induced by a dual-particle monoenergetic source. United States: N. p., Web. doi:10.1063/1.4955051.
Mayer, Michael F., Nattress, J., & Jovanovic, I.. Detection of special nuclear material from delayed neutron emission induced by a dual-particle monoenergetic source. United States. doi:10.1063/1.4955051.
Mayer, Michael F., Nattress, J., and Jovanovic, I.. 2016. "Detection of special nuclear material from delayed neutron emission induced by a dual-particle monoenergetic source". United States. doi:10.1063/1.4955051. https://www.osti.gov/servlets/purl/1282478.
@article{osti_1282478,
title = {Detection of special nuclear material from delayed neutron emission induced by a dual-particle monoenergetic source},
author = {Mayer, Michael F. and Nattress, J. and Jovanovic, I.},
abstractNote = {Detection of unique signatures of special nuclear materials is critical for their interdiction in a variety of nuclear security and nonproliferation scenarios. We report on the observation of delayed neutrons from fission of uranium induced in dual-particle active interrogation based on the 11B(d,n γ)12C nuclear reaction. Majority of the fissions are attributed to fast fission induced by the incident quasi-monoenergetic neutrons. A Li-doped glass–polymer composite scintillation neutron detector, which displays excellent neutron/γ discrimination at low energies, was used in the measurements, along with a recoil-based liquid scintillation detector. Time- dependent buildup and decay of delayed neutron emission from 238U were measured between the interrogating beam pulses and after the interrogating beam was turned off, respectively. Characteristic buildup and decay time profiles were compared to the common parametrization into six delayed neutron groups, finding a good agreement between the measurement and nuclear data. Furthermore, this method is promising for detecting fissile and fissionable materials in cargo scanning applications and can be readily integrated with transmission radiography using low-energy nuclear reaction sources.},
doi = {10.1063/1.4955051},
journal = {Applied Physics Letters},
number = 26,
volume = 108,
place = {United States},
year = {2016},
month = {6}
}