Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.649011
Title: A study of the ternary fission of 252Cf
Author: Cumpstey, David E.
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 1978
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Abstract:
A Gas Proportional Scintillation Detector has been designed and developed. In contrast to other designs, the present G.P.S.D. displays good energy resolution with respect to a-particles and fission fragments over a 2w ateradian acceptance angle, while maintaining the fast timing characteristics of a conventional gas scintillator. The principal problem to be overcome was that of obtaining a uniform light collection efficiency over an extended volume. This has been achieved by the application of a non-uniform electric field to enhance the light output in the regions of low light collection efficiency such that a uniform secondary scintillation response is attained. An empirical expression has been derived to describe the light output as a function of electric field and gas pressure. Analysis of the secondary scintillation pulse shape enables the orientation of the particle track within the counter to be deduced, thus allowing angular distribution measurements to be made. The G.P.S.C. in association with a conventional solid state E-AE telescope has been used to investigate the ternary fission of 252Cf. Measurements have been made of the energy and complete angular distributions of the long range 3H, 4He and 6He emission. Where possible, comparisons have been made with previous data which confirm the viability of the novel technique employed in the present measurements. The data has been extended to provide an essentially continuous measurement over the complete angular range and include the so-called 'polar' emission. The data does not provide conclusive evidence to suggest that the 'polar' emission process is the same or different from the 'normal' ternary emission process. Suggestions have been made to further extend the range of the measurements and also to improve the performance of the G.P.S.C. The electronic circuit constructed by the author to provide control of and data collection for the experiment is discussed in the appendix.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.649011  DOI: Not available
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