Masters Degrees (Physics)
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Browsing Masters Degrees (Physics) by browse.metadata.advisor "De Kock, P. R."
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- ItemNuclear reactions with polarized spin-1/2 beams(Stellenbosch : Stellenbosch University, 1990-03) Hillhouse, G. C. (Gregory Campbell); De Kock, P. R.; Stellenbosch University. Faculty of Science. Department of PhysicsENGLISH ABSTRACT: The first part of the thesis deals with the subject of polarization in nuclear reactions. The case where the incoming beam is polarized, is emphasized, and the theory is developed for the simple and illustrative cases of spin-t on spin-t scattering as well as spin-t on spin zero scattering. Finally, the polarization observables (or alternatively, the Wolfenstein-parameters) are introduced, their physical meanings and the ways in which they are measured, are discussed. In the second part we investigate the sensitivity of a complete set of spin-t on spin zero elastic scattering observables [ ~ , P, Q J to lelativistic and nonrelativistic predictions. The calculational approach is based on a simple relativistic extension of the first-order KMT optical potential within the context of a Dirac equation description. A formulation of this problem in terms of momentum space integral equations displaying an identifiable nonrelativistic sector is described and applied. The computer code WIZARD 1 is used in this respect and applied to the case of elastic scattering of polarized protons with energies of 135 MeV and 155 MeV on 24Mg, 2SSi and 325 targets. These results clearly demonstrate that the relativistic predictions are in far better agreement with the measured values than are the nonrelativistic results. We then propose the type of future measurements that can be made at the National Accelerator Centre, once the polarized-ion source has been installed. We also advise the implementations of relativistic calculations of the scattering observables.