Browsing by Author "Kaya, Boniface Dimitri Christel Kimene"
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- ItemNew developments in the nuclear binary cluster-core in the heavy nuclear region(Stellenbosch : Stellenbosch University, 2018-03) Kaya, Boniface Dimitri Christel Kimene; Wyngaardt, Shaun M.; Van der Ventel, B.I.S.; Stellenbosch University. Faculty of Arts and Social Sciences. Dept. of PhysicsENGLISH ABSTRACT : The atomic nucleus is a complex many-body interacting system, which exhibits a underlying correlated set of nucleon states. The cluster model is one of the most reliable models that predicts the strongly correlated subsystem of nucleons close to the decay threshold of nuclei. The binary-cluster model describes the structure and decay properties of super-heavy nuclei. The phenomenological CubicWoods-Saxon potential, developed by Buck, Merchant and Perez, has successfully predicted a number of experimental observables associated with clustering phenomenon. The recently developed microscopic double folded M3Y potential results in the inverted spectra for the positive parity excited cluster states, but successfully predicts the decay halflife for the α-Pb system. These shortcoming of the M3Y based microscopic binary cluster model lead to the newly developed hybrid cluster-core potential, obtained by fitting the phenomenological Saxon-Woods Cubed and the M3Y double folding at the surface region where the two potentials coalesce. The project presents an overview on nuclear cluster models. The double folding potentials are constructed with the M3Y and the new complex effective Gaussian form factor (CEG) effective nucleon-nucleon interactions. Furthermore the recently developed self-consistent relativistic mean-field cluster-core description is presented with the relativistic Love-Franey amplitudes. The decay half-lives for α-Pb give satisfactory results for M3Y and CEG with the addition of a zero-range exchange potential. However, the CEG with a finite-range and the relativistic mean field approach potentials for all cluster-core configurations α-Pb, C-Pb and O-Pb except Be-Pb, give decay half-lives that overestimate the experimental values. The generated positive parity level structures are inverted for α -Pb when compared to other cluster configurations which are compressed although positive. Finally we construct the hybrid cluster-core potential from different microscopic potential models. We find that predictions for the positive parity level structure, the transition probability, nuclear charge radii and deformation parameters are in good agreement with the corresponding experimental data for most cluster-core configurations.