Detection of Solar Neutrino Absorption and Study of TPB and Acrylic Fluorescence in DEAP-3600
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Authors
Ellingwood, Emma Rose
Date
2025-04-15
Type
thesis
Language
eng
Keyword
Neutrino absorption , Neutrino , Dark matter , DEAP-3600 , Fluorescence , Acrylic
Alternative Title
Abstract
DEAP-3600 is a liquid argon experiment located at SNOLAB whose principal goal is to observe WIMP dark matter. There are many DEAP-3600 analyses that can use the high livetime of the ultra-low background LAr detector to expand the scientific output of the experiment. With recent hardware upgrades, there is also a motivation to improve the detector simulation model and the understanding of the detector by studying properties of materials that can affect the detection of the scintillation light.
DEAP-3600 can use the LAr data collected for the dark matter search to attempt to make the first observation of 8B solar neutrino charged-current (CC) neutrino interactions on 40Ar, which will be referred to as neutrino absorption. It would be the first charged-current neutrino interaction detected in a dark matter experiment and it could provide a pathway for next-generation LAr experiments to do solar neutrino spectroscopy. The neutrino absorption project is split into two energy ranges where the approach depends on whether the signal or background rate dominates.
In the high-energy region (10.5-13 MeV), the expected neutrino signal dominates. This method aims to accurately model the background to look for excess events attributed to CC neutrino interactions. The results of this study are currently being reviewed by the collaboration and should appear in an upcoming publication.
In the delayed coincidence region, the two-pulse neutrino absorption signature can distinguish it from the dominant mostly single-pulse background below 10 MeV. This search relies on the accuracy of identifying two pulses in a waveform and determining the unique expected energy of the delayed pulse. This work covers the progress in this ongoing analysis on both of those projects.
This work also includes the study of the temperature-dependent fluorescence of acrylic and the wavelength shifter 1,1,4,4-tetraphenyl-1,3-butadiene (TPB) for DEAP-3600 from 4-300 K. The results can be used to improve the experiment's optical model and to understand optical properties of materials.
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