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Title: Neutron Response of the EJ-254 Boron-Loaded Plastic Scintillator

Abstract

Organic scintillators doped with capture agents provide a detectable signal for neutrons over a broad energy range. This work characterizes the fast and slow neutron response of EJ-254, an organic plastic scintillator with 5 loading by weight. For fast neutrons, the primary mechanism for light generation in organic scintillators is n-p elastic scattering. To study the fast neutron response, the proton light yield of EJ-254 was measured at the 88-Inch Cyclotron at Lawrence Berkeley National Laboratory. Using a broad-spectrum neutron source and a double time-of-flight technique, the EJ-254 proton light yield was obtained over the energy range of approximately 270 keV to 4.5 MeV and determined to be in agreement with other plastic scintillators comprised of the same polymer base. To isolate the slow neutron response, an AmBe source with polyethylene moderator was made incident on the EJ-254 scintillator surrounded by an array of EJ-309 observation detectors. Events in the EJ-254 target coincident with the signature 477.6 keV γ ray (resulting from de-excitation of the residual 7Li nucleus following boron neutron capture) were identified. Pulse shape discrimination was used to evaluate the temporal differences in the response of EJ-254 scintillation signals arising from γ-ray and fast/slow neutron interactions. Clear separationmore » between γ-ray and fast neutrons signals was not achieved and the neutron capture feature was observed to overlap both the γ-ray and fast neutron bands. Taking into account the electron light nonproportionality, the neutron capture light yield in EJ-254 was determined to be 89.4±1.1 keVee.« less

Authors:
 [1];  [2];  [1];  [3];  [1];  [4];  [5]
  1. Univ. of California, Berkeley, CA (United States)
  2. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Univ. of California, Berkeley, CA (United States
  4. Univ. of California, Berkeley, CA (United States); Univ. of California, Davis, CA (United States)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
Univ. of California, Berkeley, CA (United States). Nuclear Science and Security Consortium
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation
OSTI Identifier:
1756055
Grant/Contract Number:  
NA0003180; AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
IEEE Transactions on Nuclear Science
Additional Journal Information:
Journal Volume: 68; Journal Issue: 1; Journal ID: ISSN 0018-9499
Publisher:
IEEE
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; Neutron detector; organic scintillator; light yield; nuclear recoil; neutron capture

Citation Formats

Gabella, G., Goldblum, Bethany L., Laplace, T. A., Manfredi, J. J., Gordon, J., Sweger, Z. W., and Bourret, E. Neutron Response of the EJ-254 Boron-Loaded Plastic Scintillator. United States: N. p., 2020. Web. doi:10.1109/tns.2020.3041215.
Gabella, G., Goldblum, Bethany L., Laplace, T. A., Manfredi, J. J., Gordon, J., Sweger, Z. W., & Bourret, E. Neutron Response of the EJ-254 Boron-Loaded Plastic Scintillator. United States. https://doi.org/10.1109/tns.2020.3041215
Gabella, G., Goldblum, Bethany L., Laplace, T. A., Manfredi, J. J., Gordon, J., Sweger, Z. W., and Bourret, E. Fri . "Neutron Response of the EJ-254 Boron-Loaded Plastic Scintillator". United States. https://doi.org/10.1109/tns.2020.3041215. https://www.osti.gov/servlets/purl/1756055.
@article{osti_1756055,
title = {Neutron Response of the EJ-254 Boron-Loaded Plastic Scintillator},
author = {Gabella, G. and Goldblum, Bethany L. and Laplace, T. A. and Manfredi, J. J. and Gordon, J. and Sweger, Z. W. and Bourret, E.},
abstractNote = {Organic scintillators doped with capture agents provide a detectable signal for neutrons over a broad energy range. This work characterizes the fast and slow neutron response of EJ-254, an organic plastic scintillator with 5 loading by weight. For fast neutrons, the primary mechanism for light generation in organic scintillators is n-p elastic scattering. To study the fast neutron response, the proton light yield of EJ-254 was measured at the 88-Inch Cyclotron at Lawrence Berkeley National Laboratory. Using a broad-spectrum neutron source and a double time-of-flight technique, the EJ-254 proton light yield was obtained over the energy range of approximately 270 keV to 4.5 MeV and determined to be in agreement with other plastic scintillators comprised of the same polymer base. To isolate the slow neutron response, an AmBe source with polyethylene moderator was made incident on the EJ-254 scintillator surrounded by an array of EJ-309 observation detectors. Events in the EJ-254 target coincident with the signature 477.6 keV γ ray (resulting from de-excitation of the residual 7Li nucleus following boron neutron capture) were identified. Pulse shape discrimination was used to evaluate the temporal differences in the response of EJ-254 scintillation signals arising from γ-ray and fast/slow neutron interactions. Clear separation between γ-ray and fast neutrons signals was not achieved and the neutron capture feature was observed to overlap both the γ-ray and fast neutron bands. Taking into account the electron light nonproportionality, the neutron capture light yield in EJ-254 was determined to be 89.4±1.1 keVee.},
doi = {10.1109/tns.2020.3041215},
journal = {IEEE Transactions on Nuclear Science},
number = 1,
volume = 68,
place = {United States},
year = {Fri Nov 27 00:00:00 EST 2020},
month = {Fri Nov 27 00:00:00 EST 2020}
}

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