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Title: Quenching measurements and modeling of a boron-loaded organic liquid scintillator

Abstract

Organic liquid scintillators are used in a wide variety of applications in experimental nuclear and particle physics. Boron-loaded scintillators are particularly useful for detecting neutron captures, due to the high thermal neutron capture cross section of 10B. These scintillators are commonly used in neutron detectors, including the DarkSide-50 neutron veto, where the neutron may produce a signal when it scatters o protons in the scintillator or when it captures on 10B. Reconstructing the energy of these recoils is complicated by scintillation quenching. Understanding how nuclear recoils are quenched in these scintillators is an important and dicult problem. In this article, we present a set of measurements of neutron-induced proton recoils in a boron-loaded organic liquid scintillator at recoil energies ranging from 57-467 keV, and we compare these measurements to predictions from different quenching models. We and that a modified Birks' model whose denominator is quadratic in dE=dx best describes the measurements, with χ 2/NDF = 1:6. This result will help model nuclear recoil scintillation in similar detectors and can be used to improve their neutron tagging efficiency.

Authors:
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Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1375375
Report Number(s):
PNNL-SA-125113
Journal ID: ISSN 1748-0221
DOE Contract Number:
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Instrumentation; Journal Volume: 12; Journal Issue: 08
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY

Citation Formats

Westerdale, S., Xu, J., Shields, E., Froborg, F., Calaprice, F., Alexander, T., Aprahamian, A., Back, H. O., Casarella, C., Fang, X., Gupta, Y. K., Lamere, E., Liu, Q., Lyons, S., Smith, M., and Tan, W. Quenching measurements and modeling of a boron-loaded organic liquid scintillator. United States: N. p., 2017. Web. doi:10.1088/1748-0221/12/08/P08002.
Westerdale, S., Xu, J., Shields, E., Froborg, F., Calaprice, F., Alexander, T., Aprahamian, A., Back, H. O., Casarella, C., Fang, X., Gupta, Y. K., Lamere, E., Liu, Q., Lyons, S., Smith, M., & Tan, W. Quenching measurements and modeling of a boron-loaded organic liquid scintillator. United States. doi:10.1088/1748-0221/12/08/P08002.
Westerdale, S., Xu, J., Shields, E., Froborg, F., Calaprice, F., Alexander, T., Aprahamian, A., Back, H. O., Casarella, C., Fang, X., Gupta, Y. K., Lamere, E., Liu, Q., Lyons, S., Smith, M., and Tan, W. Tue . "Quenching measurements and modeling of a boron-loaded organic liquid scintillator". United States. doi:10.1088/1748-0221/12/08/P08002.
@article{osti_1375375,
title = {Quenching measurements and modeling of a boron-loaded organic liquid scintillator},
author = {Westerdale, S. and Xu, J. and Shields, E. and Froborg, F. and Calaprice, F. and Alexander, T. and Aprahamian, A. and Back, H. O. and Casarella, C. and Fang, X. and Gupta, Y. K. and Lamere, E. and Liu, Q. and Lyons, S. and Smith, M. and Tan, W.},
abstractNote = {Organic liquid scintillators are used in a wide variety of applications in experimental nuclear and particle physics. Boron-loaded scintillators are particularly useful for detecting neutron captures, due to the high thermal neutron capture cross section of 10B. These scintillators are commonly used in neutron detectors, including the DarkSide-50 neutron veto, where the neutron may produce a signal when it scatters o protons in the scintillator or when it captures on 10B. Reconstructing the energy of these recoils is complicated by scintillation quenching. Understanding how nuclear recoils are quenched in these scintillators is an important and dicult problem. In this article, we present a set of measurements of neutron-induced proton recoils in a boron-loaded organic liquid scintillator at recoil energies ranging from 57-467 keV, and we compare these measurements to predictions from different quenching models. We and that a modified Birks' model whose denominator is quadratic in dE=dx best describes the measurements, with χ2/NDF = 1:6. This result will help model nuclear recoil scintillation in similar detectors and can be used to improve their neutron tagging efficiency.},
doi = {10.1088/1748-0221/12/08/P08002},
journal = {Journal of Instrumentation},
number = 08,
volume = 12,
place = {United States},
year = {Tue Aug 01 00:00:00 EDT 2017},
month = {Tue Aug 01 00:00:00 EDT 2017}
}