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Study of the Response of a New Continuous Compressionless Bubble Chamber

  • Author / Creator
    Cruz Venegas, Noel Alberto
  • Bubble chambers filled with fluorocarbons are a world-leading technology to search for nuclear recoils produced by spin-dependent WIMP dark matter particles. In this work, a novel bubble chamber using 28 ± 1 ml of the fluorocarbon C5F12 as target material is investigated. This superheated liquid detector nucleates bubbles as the result of elastic scattering off nuclei with neutral particles for example dark matter or neutrons. As the chamber produces small eruptions at the top, when a nuclear recoil happens inside the superheated liquid, it was named Geyser, like the geothermal phenomenon. The C5F12 Geyser bubble chamber does not require to be pressurized after every event to restore the active liquid. Instead, it uses a combination of gravity and temperature gradient to achieve an almost continuously superheated state. The whole apparatus, also referred to as a compressionless bubble chamber, was exposed to neutrons coming from an AmBe source. In a live-time of 2.45 ± 0.03 hours, the detector demonstrated evidence of AmBe neutron recoil events. A comparison of a Geant4 Monte Carlo simulation of the same detector, allowed for the calculation of dead time ( 27.9±3.0 seconds) and detector efficiency ( 56.5 ± 5.0 %).

  • Subjects / Keywords
  • Graduation date
    Fall 2021
  • Type of Item
    Thesis
  • Degree
    Master of Science
  • DOI
    https://doi.org/10.7939/r3-s1ez-7b12
  • License
    This thesis is made available by the University of Alberta Libraries 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.