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Title: Neutron light output function and resolution investigation of the deuterated organic liquid scintillator EJ-315

Abstract

Here, we investigate the light response to fast neutrons and estimate the pulse height resolution of a deuterated liquid organic scintillator, EJ-315, considering the detector's non-linear light response to gamma-rays. Initially, collision data and a neutron beam trigger are recorded in coincidence mode, and incident neutron energy is calculated with a time-of-flight technique. Fast neutrons are further discriminated from gamma-ray background based on the scintillation material decay patterns using a pulse shape discrimination algorithm. We also derived a light response matrix composed of multiple neutron energy and their corresponding light outputs. The pulse height resolution property of the EJ-315 is characterized utilizing the derivatives of the pulse height distributions with corrections of the mea-surements setup uncertainties. In addition, the EJ-315's pulse height resolution is also characterized by comparing the smoothed derivatives of quasi-monoenergetic neutron pulse height distributions, given by the Peierls-formula-based analytic model, to match the measurement data. Results show rather consistent 10e13% pulse resolution for mono-energetic neutrons with kinetic energy above 2 MeV. The resolution decreases slightly with an increase in neutron energy indicating the improved resolution performance of EJ-315 in the higher energy events.

Authors:
 [1];  [2];  [2];  [1]
  1. Univ. of Florida, Gainesville, FL (United States). Nuclear Engineering Program
  2. Ohio Univ., Athens, OH (United States). Inst. of Nuclear and Particle Physics
Publication Date:
Research Org.:
Univ. of Michigan, Ann Arbor, MI (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA), Office of Nonproliferation and Verification Research and Development (NA-22); USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation (NA-20)
OSTI Identifier:
1366757
Alternate Identifier(s):
OSTI ID: 1487074
Grant/Contract Number:  
NA0002534
Resource Type:
Accepted Manuscript
Journal Name:
Radiation Measurements
Additional Journal Information:
Journal Volume: 89; Journal Issue: C; Journal ID: ISSN 1350-4487
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; Pulse height distribution; Deuterated scintillation detectors; Pulse shape discrimination; EJ-315; Time-of-flight; Time-of-flight

Citation Formats

Wang, Haitang, Carter, Donald, Massey, Thomas N., and Enqvist, Andreas. Neutron light output function and resolution investigation of the deuterated organic liquid scintillator EJ-315. United States: N. p., 2016. Web. doi:10.1016/j.radmeas.2016.03.009.
Wang, Haitang, Carter, Donald, Massey, Thomas N., & Enqvist, Andreas. Neutron light output function and resolution investigation of the deuterated organic liquid scintillator EJ-315. United States. doi:10.1016/j.radmeas.2016.03.009.
Wang, Haitang, Carter, Donald, Massey, Thomas N., and Enqvist, Andreas. Mon . "Neutron light output function and resolution investigation of the deuterated organic liquid scintillator EJ-315". United States. doi:10.1016/j.radmeas.2016.03.009. https://www.osti.gov/servlets/purl/1366757.
@article{osti_1366757,
title = {Neutron light output function and resolution investigation of the deuterated organic liquid scintillator EJ-315},
author = {Wang, Haitang and Carter, Donald and Massey, Thomas N. and Enqvist, Andreas},
abstractNote = {Here, we investigate the light response to fast neutrons and estimate the pulse height resolution of a deuterated liquid organic scintillator, EJ-315, considering the detector's non-linear light response to gamma-rays. Initially, collision data and a neutron beam trigger are recorded in coincidence mode, and incident neutron energy is calculated with a time-of-flight technique. Fast neutrons are further discriminated from gamma-ray background based on the scintillation material decay patterns using a pulse shape discrimination algorithm. We also derived a light response matrix composed of multiple neutron energy and their corresponding light outputs. The pulse height resolution property of the EJ-315 is characterized utilizing the derivatives of the pulse height distributions with corrections of the mea-surements setup uncertainties. In addition, the EJ-315's pulse height resolution is also characterized by comparing the smoothed derivatives of quasi-monoenergetic neutron pulse height distributions, given by the Peierls-formula-based analytic model, to match the measurement data. Results show rather consistent 10e13% pulse resolution for mono-energetic neutrons with kinetic energy above 2 MeV. The resolution decreases slightly with an increase in neutron energy indicating the improved resolution performance of EJ-315 in the higher energy events.},
doi = {10.1016/j.radmeas.2016.03.009},
journal = {Radiation Measurements},
number = C,
volume = 89,
place = {United States},
year = {2016},
month = {4}
}

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Figure 1 Figure 1: Simplified sketch of the facility in Edwards Accelerator Laboratory, showing the measurement tunnel that was utilized in this research in the right upper corner.

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