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Title: The breakup reactions of polarized 7Li
Author: Shepherd-Themistocleous, Claire Heather
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 1991
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This thesis is an investigation of the breakup of 70MeV polarized 7Li on a 120Sn target. The reaction of primary interest is the breakup of 7Li into an α and a t. The analysing power ^T T_20 has been measured for this reaction for angles ranging between 9^o and 25^o. The data between 9^o and 15^o was found to agree with a semi-classical calculation for ^T T_20 which assumed that λchar61 1 for the breakup. This implied that at these angles the direct breakup reaction is a Coulomb one. This method of investigation of the reaction mechanism is an improvement on the previously used method of measuring differential cross sections. Analysing powers are inherently more sensitive to measures of deviations from assumptions that are made in reaction models and should therefore enable a more accurate test of the mechanism in question than differential cross sections would allow. The greatly reduced possibility of systematic errors and the requirement of relative rather than absolute yields are also major advantages of analysing powers over differential cross sections. The analysing powers of the sequential breakup of ^7Li and the transfer breakup reactions ^120Sn(^7Li,αchar43 d)^121Sn_g.s.,0.06 and ^120Sn(^7Li,αchar43 α)119Ing.s.,0.31 were also measured. A comparison of the sequential breakup data with a semi-classical calculation did not provide any evidence for a Coulomb dominated process. Calculations do not at present exist for the transfer breakup reactions, but qualitative explanations of the sign and angular distribution of the analysing power TT20 have been proposed.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available