[{"key":"dc.contributor.author","value":"Miller, Douglas Burton","language":null},{"key":"dc.date.accessioned","value":"2011-06-29T16:53:54Z","language":null},{"key":"dc.date.available","value":"2011-06-29T16:53:54Z","language":null},{"key":"dc.date.issued","value":"1968","language":null},{"key":"dc.identifier.uri","value":"http:\/\/hdl.handle.net\/2429\/35802","language":null},{"key":"dc.description.abstract","value":"Lifetime techniques have been used to measure the direct annihilation rate in Argon gas as a function of temperature. In order to accomplish this, a pressure chamber capable of holding 10 amagats of gas at 300\u00b0C was designed and constructed.\r\nThe temperature of the Argon gas was varied between 140\u00b0K and 480\u00b0K. The results were collected at specific temperatures for gas densities of 8.0 and 10.2 amagats. The direct annihilation rate was found to be a decreasing function of temperature meaning it is a decreasing function of velocity. The direct annihilation rate decreased by 30% over the range investigated. Various functions in temperature were fitted to the results by the least squares technique.\r\nThe shoulder width-density product was found to be constant with temperature indicating that the shoulder annihilations take place at velocities significantly greater than thermal velocities.\r\nThe statistics on the ortho-positronium lifetime were not sufficiently good to see a temperature variation of this component.\r\nA comparison of an electric result with these results gave a position - Argon atom scattering rate of 9.0xl0\u00b9\u00b9sec\u02c9\u00b9am\u02c9\u00b9. This was assuming that the scattering rate was independent of velocity.","language":"en"},{"key":"dc.language.iso","value":"eng","language":"en"},{"key":"dc.publisher","value":"University of British Columbia","language":"en"},{"key":"dc.rights","value":"For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https:\/\/open.library.ubc.ca\/terms_of_use.","language":null},{"key":"dc.title","value":"Temperature effect of positron annihilation in argon","language":"en"},{"key":"dc.type","value":"Text","language":"en"},{"key":"dc.degree.name","value":"Master of Applied Science - MASc","language":"en"},{"key":"dc.degree.discipline","value":"Physics","language":"en"},{"key":"dc.degree.grantor","value":"University of British Columbia","language":"en"},{"key":"dc.type.text","value":"Thesis\/Dissertation","language":"en"},{"key":"dc.description.affiliation","value":"Science, Faculty of","language":null},{"key":"dc.description.affiliation","value":"Physics and Astronomy, Department of","language":null},{"key":"dc.degree.campus","value":"UBCV","language":"en"},{"key":"dc.description.scholarlevel","value":"Graduate","language":"en"}]