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Permanent link (DOI): https://doi.org/10.7939/R3BN9XF6T

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A LIKELIHOOD RATIO ALGORITHM FOR REMOVING LOCALIZED ALPHA PARTICLE BACKGROUNDS IN THE DEAP-3600 DETECTOR Open Access

Descriptions

Other title
Subject/Keyword
likelihood ratio algorithm
DEAP-3600
alpha particle backgrounds
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Mielnichuk, Courtney T.
Supervisor and department
Hallin, Aksel (Physics)
Examining committee member and department
LeBlanc, Lindsay (Physics)
Kopper, Claudio (Physics)
Grant, Darren (Physics)
Department
Department of Physics
Specialization

Date accepted
2017-03-27T14:51:42Z
Graduation date
2017-06:Spring 2017
Degree
Master of Science
Degree level
Master's
Abstract
DEAP-3600 (Dark Matter Experiment using Argon for Pulse shape discrimination) is a single phase dark matter experiment using a tonne-scale mass of liquid argon as a target to observe spin-independent interactions with Weakly Interacting Massive Particles (WIMPs). Alpha decays from radioactive nuclei accumulating on the surface of detector materials are a background concern for the experiment. Specifically, alpha decays occurring in the neck region of the detector produce signals with characteristics similar to those expected for WIMP interactions. In order to estimate the potential background from alpha decays in the detector neck, projected material radioactivity levels have been incorporated into Monte Carlo simulations. A likelihood ratio algorithm to discriminate between neck alpha decays and a WIMP signal has been developed based on Monte Carlo simulation. The benefit of implementing a likelihood ratio cut, both in comparison and in combination with a fiducial volume cut, has been studied. Preliminary results of the likelihood ratio applied to commissioning data are also studied.
Language
English
DOI
doi:10.7939/R3BN9XF6T
Rights
This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for the purpose of private, scholarly or scientific research. 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.
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