Alpha decay and alpha elastic scattering by heavy nuclei

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dc.contributor.advisorPerez, Sandro Men_ZA
dc.contributor.authorTripe, Peteren_ZA
dc.date.accessioned2016-03-01T07:46:48Z
dc.date.available2016-03-01T07:46:48Z
dc.date.issued1993en_ZA
dc.descriptionIncludes bibliographical references.en_ZA
dc.description.abstractA simple three parameter cluster model has previously been developed by Buck, Merchant and Perez to successfully describe alpha decay half lives for more than 400 nuclei. An important feature of this model is that it envisages preformed (preformation factor, P=1.0) alpha particles in the parent nuclei to be moving in orbits with a large value of a global quantum number, G. The discontinuity in decay half-lives at the N=l26 neutron shell closure is then naturally explained by an increase of G as the alpha particle is forced into a higher orbit by the shell closure. We consider alternative approaches to this model and extend it to consider different values of P, and different changes in G at shell closures. We find the original approach of Buck et al., a radius fit with ΔG=2, is still the most successful, but that a potential fit with ΔG=4 turns out to be competitive, lending support to the suggestion that the proton shell closure is also felt. We have also analysed low energy (24.7MeV) scattering of alpha particles from a number of heavy nuclei in an attempt to find a common set of potential parameters that adequately reproduces both the decay and scattering data. Although not completely successful in this attempt, we find that the potential parameters obtained in the decay calculations provide a good first guess at the scattering potential parameters. The above analysis constrains P to the range 0.01≤P≤0.1, with the value of P=1.0 not ruled out.en_ZA
dc.identifier.apacitationTripe, P. (1993). <i>Alpha decay and alpha elastic scattering by heavy nuclei</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Physics. Retrieved from http://hdl.handle.net/11427/17411en_ZA
dc.identifier.chicagocitationTripe, Peter. <i>"Alpha decay and alpha elastic scattering by heavy nuclei."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Physics, 1993. http://hdl.handle.net/11427/17411en_ZA
dc.identifier.citationTripe, P. 1993. Alpha decay and alpha elastic scattering by heavy nuclei. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Tripe, Peter AB - A simple three parameter cluster model has previously been developed by Buck, Merchant and Perez to successfully describe alpha decay half lives for more than 400 nuclei. An important feature of this model is that it envisages preformed (preformation factor, P=1.0) alpha particles in the parent nuclei to be moving in orbits with a large value of a global quantum number, G. The discontinuity in decay half-lives at the N=l26 neutron shell closure is then naturally explained by an increase of G as the alpha particle is forced into a higher orbit by the shell closure. We consider alternative approaches to this model and extend it to consider different values of P, and different changes in G at shell closures. We find the original approach of Buck et al., a radius fit with ΔG=2, is still the most successful, but that a potential fit with ΔG=4 turns out to be competitive, lending support to the suggestion that the proton shell closure is also felt. We have also analysed low energy (24.7MeV) scattering of alpha particles from a number of heavy nuclei in an attempt to find a common set of potential parameters that adequately reproduces both the decay and scattering data. Although not completely successful in this attempt, we find that the potential parameters obtained in the decay calculations provide a good first guess at the scattering potential parameters. The above analysis constrains P to the range 0.01≤P≤0.1, with the value of P=1.0 not ruled out. DA - 1993 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1993 T1 - Alpha decay and alpha elastic scattering by heavy nuclei TI - Alpha decay and alpha elastic scattering by heavy nuclei UR - http://hdl.handle.net/11427/17411 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/17411
dc.identifier.vancouvercitationTripe P. Alpha decay and alpha elastic scattering by heavy nuclei. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Physics, 1993 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/17411en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Physicsen_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherPhysicsen_ZA
dc.subject.otherNuclear Physicsen_ZA
dc.titleAlpha decay and alpha elastic scattering by heavy nucleien_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMScen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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