A Data-Driven Method for Measuring Position Resolution in the DEAP-3600 DarkMatter Detector

  • Author / Creator
    Willis, Joseph
  • DEAP-3600 is a single-phase liquid Argon dark matter detector operated at SNOLAB in Ontario, Canada, searching for Weakly Interacting Massive Particles (WIMPs).
    It is well-established that astronomical and cosmological observations suggest the existence of some form of unseen matter in the universe, with the WIMP as one of the
    primary candidates. DEAP-3600 has set the leading limit on the WIMP-nucleon spin-independent cross-section for Argon based experiments, at 3.9 × 10−45 cm2 (1.5 × 10−44 cm2) for a 100 GeV c−2 (1 TeV c−2) mass WIMP (90% C.L.). A key
    factor in mitigating one source of backgrounds is the removal of events caused by contaminants on the inner surface of the acrylic vessel, achieved through means of position
    reconstruction and a fiducial cut on the reconstructed spherical radius. Understanding the precision of the reconstruction is therefore vital to knowing its effectiveness and so the goal of this project was to develop a method of measuring the position resolution in data. Using a process of event splitting this goal was achieved, demonstrating
    resolutions between 30 and 45 mm at the fiduciary boundary and at the energy range considered for candidate WIMP events.

  • Subjects / Keywords
  • Graduation date
    Fall 2019
  • Type of Item
  • Degree
    Master of Science
  • DOI
  • License
    Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.