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Please use this identifier to cite or link to this item: http://hdl.handle.net/1974/5323

Title: A New and Improved Spin-Dependent Dark Matter Exclusion Limit Using the PICASSO Experiment
Authors: Clark, Kenneth

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Keywords: dark matter
neutralino
direct detection
wimp
Issue Date: 2009
Series/Report no.: Canadian theses
Abstract: The PICASSO project is a direct dark matter search experiment located 2070 metres underground in SNOLAB. Superheated droplets of Freon (C4F10) are used as the active mass, providing a target for the incoming neutralinos. Recoiling nuclei deposit energy in the superheated Freon droplets, triggering a phase transition, the pressure waves of which can be detected using piezo-electric sensors. Previously published limits using an exposure of 1.98 +/- 0.19 kg day obtained a peak spin-dependent cross section exclusion limit for neutralino-proton interactions of 1.31 pb at a neutralino mass of 29 GeV/c^2 at a 90% confidence level. Improvements in the detectors installed in the underground experiment have provided 20.99 +/- 0.25 kg day for analysis and improvements in the analysis method have produced an exclusion limit of 2.9 X 10^(-2) pb at a neutralino mass of 16.7 GeV/c^2. In addition, a thorough study of the backgrounds, corrections and systematic uncertainties has been included, indicating that this limit does not exceed 3.5 X 10^(-2) pb when considering the one sigma error on the uncertainty band.
Description: Thesis (Ph.D, Physics, Engineering Physics and Astronomy) -- Queen's University, 2008-08-29 11:42:31.428
URI: http://hdl.handle.net/1974/5323
Appears in Collections:Queen's Theses & Dissertations
Physics, Engineering Physics & Astronomy Graduate Theses

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