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Title: Calculation and measurement of the Rayleigh scattering length of the scintillation wavelength of liquid argon for dark matter and neutrino detectors
Author: Williams, Emily
Awarding Body: Royal Holloway, University of London
Current Institution: Royal Holloway, University of London
Date of Award: 2018
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There is wealth of evidence that the majority of the matter in the universe is composed of non-baryonic dark matter. One candidate for dark matter is weakly interacting massive particle (WIMP). There are many detectors searching for evidence of WIMP particle interaction. A common active medium is liquid argon. Argon, like all noble elements is a scintillator, meaning it produces light when exposed to radiation. Within these large, liquid argon detectors, one method of determining the signicance of the event is by determining the event location. This involves a deep understanding of how the scintillation light optically propagates through the detector, including the Rayleigh scattering length. The Rayleigh scattering length of liquid argon was formerly contention, as experimental results did not agree with a theoretical calculation. We will discuss an update calculation of the wavelength dependent scattering in argon using historical measurements. These calculations were tested using an experimental test stand, designed and constructed at Royal Holloway. This will show that the scattering length of the scintillation light of liquid argon is 58 cm.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Argon ; Dark matter ; Rayleigh Scattering ; SCINTILLATION ; Neutrinos