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Time Correlation Study in DEAP-3600 Dataset
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- Author / Creator
- Papi, Danial
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DEAP-3600 is a single-phase dark matter experiment that utilizes 3.3 tonnes of liquid argon as a scintillation target to detect Weakly Interacting Massive Particles (WIMPs). Two significant challenges in the DEAP-3600 experiment are alpha particles produced in the acrylic vessel neck and dust, which can mimic a WIMP signal. In this thesis, the 214Bi-214Po decay chain was identified in the three-year dataset based on the time correlation. The study demonstrated that degraded alphas originated in dust. A comparison of the time distribution from dust and TPB-coated surface alpha particles showed differences, demonstrating that most dust is not TPB-coated. Time correlation allows us to identify the 220Rn-216Po decay chain. Comparing surface alphas from 214Bi-214Po and 220Rn-216Po revealed differences in their energy distribution, indicating that the alphas from 220Rn-216Po may have originated in the acrylic. A toy Monte Carlo simulation was used to investigate the differences observed in the alpha energy distributions. Although this model could account for some characteristics of the energy distribution, it could not fully explain it.
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- Subjects / Keywords
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- Graduation date
- Fall 2024
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- Type of Item
- Thesis
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- Degree
- Master of Science
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- License
- This thesis is made available by the University of Alberta Library with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.