NDLI: Hybrid Liquid Organic Scintillator and Lithium-6 Glass Neutron Detector : Correlated Pulses

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Hybrid Liquid Organic Scintillator and Lithium-6 Glass Neutron Detector : Correlated Pulses

Content Provider	Semantic Scholar
Author	McClellan, Andrew D.
Copyright Year	2016
Abstract	Hybrid Liquid Organic Scintillator and Lithium-6 Glass Neutron Detector: Correlated Pulses Andrew McClellan Department of Physics and Astronomy, BYU Bachelor of Science In recent years, there has been a 3He shortage, resulting in a need for alternative neutron detectors that can efficiently distinguish between neutrons and gammas. A hybrid liquid organic scintillator and lithium-6 glass neutron detector has been developed and tested to determine its neutron-gamma discrimination capabilities using pulse shape discrimination (PSD). Two liquid scintillators, Eljen EJ-325a and EJ-325UV, were compared. The EJ-325UV lacks a wavelengthshifting phosphor so as to minimize the significance of the absorption of lithium glass light in the scintillator. Principal component analysis (PCA) is explored as a method to improve neutron and gamma region separation. Previous work is extended from singleto correlated-pulse analysis, which declares an event a neutron if a liquid scintillator recoil pulse precedes a lithium capture pulse. It was found that PCA fails to improve region separation and efficiencies, but it does provide quantifiable measures of the significance of PSD parameters in distinguishing between events. The correlated-pulse analysis method reduces the ratio of misidentified gammas by an order of magnitude, but reduces the detector efficiency to less than one percent. The detector utilizing EJ-325UV identified 20–40% more neutrons than the EJ-325a detector. Further analysis is needed to determine the importance of self-absorption in the hybrid detector.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://www.physics.byu.edu/docs/thesis/719
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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