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Title: Characterization of water-based liquid scintillator for Cherenkov and scintillation separation

Abstract

This paper presents measurements of the scintillation light yield and time profile for a number of concentrations of water-based liquid scintillator, formulated from linear alkylbenzene (LAB) and 2,5-diphenyloxazole (PPO). We find that the scintillation light yield is linear with the concentration of liquid scintillator in water between 1 and 10% with a slope of 127.9±17.0 ph/MeV/concentration and an intercept value of 108.3±51.0 ph/MeV, the latter being illustrative of non-linearities with concentration at values less than 1%. This is larger than expected from a simple extrapolation of the pure liquid scintillator light yield. The measured time profiles are consistently faster than that of pure liquid scintillator, with rise times less than 250 ps and prompt decay constants in the range of 2.1–2.85 ns. Additionally, the separation between Cherenkov and scintillation light is quantified using cosmic muons in the CHESS experiment for each formulation, demonstrating an improvement in separation at the centimeter scale. Finally, we briefly discuss the prospects for large-scale detectors.

Authors:
ORCiD logo; ; ;
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA), Office of Nonproliferation and Verification Research and Development; USDOE Office of Science (SC)
OSTI Identifier:
1664491
Alternate Identifier(s):
OSTI ID: 1693389; OSTI ID: 1706657
Report Number(s):
BNL-220017-2020-JAAM
Journal ID: ISSN 1434-6044; 867; PII: 8418
Grant/Contract Number:  
AC02-05CH11231; AC02-98CH10886; SC0018974; SC0012704
Resource Type:
Published Article
Journal Name:
European Physical Journal. C, Particles and Fields
Additional Journal Information:
Journal Name: European Physical Journal. C, Particles and Fields Journal Volume: 80 Journal Issue: 9; Journal ID: ISSN 1434-6044
Publisher:
Springer
Country of Publication:
Germany
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Caravaca, J., Land, B. J., Yeh, M., and Orebi Gann, G. D.. Characterization of water-based liquid scintillator for Cherenkov and scintillation separation. Germany: N. p., 2020. Web. https://doi.org/10.1140/epjc/s10052-020-8418-4.
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Caravaca, J., Land, B. J., Yeh, M., & Orebi Gann, G. D.. Characterization of water-based liquid scintillator for Cherenkov and scintillation separation. Germany. https://doi.org/10.1140/epjc/s10052-020-8418-4
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Caravaca, J., Land, B. J., Yeh, M., and Orebi Gann, G. D.. Sun . "Characterization of water-based liquid scintillator for Cherenkov and scintillation separation". Germany. https://doi.org/10.1140/epjc/s10052-020-8418-4.
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@article{osti_1664491,
title = {Characterization of water-based liquid scintillator for Cherenkov and scintillation separation},
author = {Caravaca, J. and Land, B. J. and Yeh, M. and Orebi Gann, G. D.},
abstractNote = {This paper presents measurements of the scintillation light yield and time profile for a number of concentrations of water-based liquid scintillator, formulated from linear alkylbenzene (LAB) and 2,5-diphenyloxazole (PPO). We find that the scintillation light yield is linear with the concentration of liquid scintillator in water between 1 and 10% with a slope of 127.9±17.0 ph/MeV/concentration and an intercept value of 108.3±51.0 ph/MeV, the latter being illustrative of non-linearities with concentration at values less than 1%. This is larger than expected from a simple extrapolation of the pure liquid scintillator light yield. The measured time profiles are consistently faster than that of pure liquid scintillator, with rise times less than 250 ps and prompt decay constants in the range of 2.1–2.85 ns. Additionally, the separation between Cherenkov and scintillation light is quantified using cosmic muons in the CHESS experiment for each formulation, demonstrating an improvement in separation at the centimeter scale. Finally, we briefly discuss the prospects for large-scale detectors.},
doi = {10.1140/epjc/s10052-020-8418-4},
journal = {European Physical Journal. C, Particles and Fields},
number = 9,
volume = 80,
place = {Germany},
year = {2020},
month = {9}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1140/epjc/s10052-020-8418-4
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