Global ETD Search

1	A microscopic description of nuclear alpha decay Ogunbade, Olusegun G. 30 September 2005 (has links) Radioactive decay of nuclei via emission of ??-particles is studied using three different theoretical approaches, viz: the quasi-bound state wavefunction approach (QSWA), the superasymmetric ??ssion model (SAFM) and the semiclassical approximation (QCA). The half-lives of the radioactive nuclei, calculated using these methods, are compared with each other and with available experimental data. The resonance wavefunction is obtained by numerically integrating the Schrödinger equation with outgoing boundary conditions. The sensitivity of the calculated decay widths to two particular parameter sets of the Woods-Saxon (WS) optical potentials are studied. Double folding (DF) model calculations to obtain the bare ??-nucleus potential have been carried out with the Reid M3Y effective nucleon-nucleon (NN) interactions. The exchange part of the interaction was taken to be of zero-range pseudo-potential and the density dependence of the NN interaction is accounted for. The effectiveness of the method is demonstrated using both even-even and odd-mass spherical nuclei. / Physics / MSC (PHYSICS) Preformed cluster Superasymmetric session model Double folding potential Alpha decay 539.7522 Alpha decay Nuclear optical potentials
2	A microscopic description of nuclear alpha decay Ogunbade, Olusegun G. 30 September 2005 (has links) Radioactive decay of nuclei via emission of ??-particles is studied using three different theoretical approaches, viz: the quasi-bound state wavefunction approach (QSWA), the superasymmetric ??ssion model (SAFM) and the semiclassical approximation (QCA). The half-lives of the radioactive nuclei, calculated using these methods, are compared with each other and with available experimental data. The resonance wavefunction is obtained by numerically integrating the Schrödinger equation with outgoing boundary conditions. The sensitivity of the calculated decay widths to two particular parameter sets of the Woods-Saxon (WS) optical potentials are studied. Double folding (DF) model calculations to obtain the bare ??-nucleus potential have been carried out with the Reid M3Y effective nucleon-nucleon (NN) interactions. The exchange part of the interaction was taken to be of zero-range pseudo-potential and the density dependence of the NN interaction is accounted for. The effectiveness of the method is demonstrated using both even-even and odd-mass spherical nuclei. / Physics / MSC (PHYSICS) Preformed cluster Superasymmetric session model Double folding potential Alpha decay 539.7522 Alpha decay Nuclear optical potentials
3	Interaction of the eta-meson with light nuclei De Villiers, Jean Schepers 30 November 2005 (has links) The long-standing problem of possible formation of metastable states in collisions of the eta-meson with atomic nuclei is revisited. The two-body eta-nucleon interaction is described by a local potential, which is constructed by fitting known low-energy parameters of this interaction. The many-body eta-nucleus potential obtained within the folding model, is used to search for metastable states of the systems formed by the eta-meson with hydrogen and helium isotopes. It is found that all these systems generate strings of overlapping resonances. / Physics / M.Sc. (Physics) Hydrogen Light nuclei Eta-nucleus interaction Eta-meson Hydrogen Deuteron Triton Helium Helion (He-3) Resonances Quasibound states Folding potential Density function Eta-nucleon interaction 539.7232 Protons Hydrogen Helium Density functionals
4	Interaction of the eta-meson with light nuclei De Villiers, Jean Schepers 30 November 2005 (has links) The long-standing problem of possible formation of metastable states in collisions of the eta-meson with atomic nuclei is revisited. The two-body eta-nucleon interaction is described by a local potential, which is constructed by fitting known low-energy parameters of this interaction. The many-body eta-nucleus potential obtained within the folding model, is used to search for metastable states of the systems formed by the eta-meson with hydrogen and helium isotopes. It is found that all these systems generate strings of overlapping resonances. / Physics / M.Sc. (Physics) Hydrogen Light nuclei Eta-nucleus interaction Eta-meson Hydrogen Deuteron Triton Helium Helion (He-3) Resonances Quasibound states Folding potential Density function Eta-nucleon interaction 539.7232 Protons Hydrogen Helium Density functionals

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