Browsing by Author "Sithole, Makuhane Abel"

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    Coupling of single neutron configurations to collective core excitations in 162Yb using 163Yb
    (University of the Western Cape, 2017) Sithole, Makuhane Abel; Schafer, John Sharpey
    In odd-nuclei the single nucleon can couple to collective excitations of its even-even core nucleus . These collective excitations lie within the pairing gap and are therefore the lowest energy excitations of the core. Our physics motivation is to search for structures where an odd neutron couples to collective excitations of the 162Yb core. We also searched for high-K structures in this nucleus. The experiment 152Sm(16O,5n)163Yb at Elab = 93 MeV was performed to study 163Yb at iThemba LABS. The gamma-decays from the reaction products have been detected using the AFRODITE (AFRican Omnipurpose Detector for Innovative Techniques and Experiments) gamma-ray spectrometer [2] equipped with 8 escape-suppressed clover detectors.
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    New Collective structures in the Z=76 stable odd neutron nucleus, 187Os
    (University of the Western Cape, 2021) Sithole, Makuhane Abel; Lawrie, E A
    Low- and medium-spin bands of 187Os have been studied using the AFRODITE array, following the 186W(4He,3n)187Os reaction at a beam energy of 37 MeV. The measurements of γ − γ coincidences, angular distribution ratios (RAD), polarization and γ-intensities were performed using eleven High Purity Germanium (HPGe) clover detectors. In the current work, all the previously known bands have been significantly extended and five new bands have been added to the level scheme. The observed bands are interpreted within the cranked shell model (CSM), cranked Nilsson-StrutinskyBogoliubov (CNSB) formalism and Quasiparticle-plus-Triaxial-Rotor (QTR) model. Systematic comparison of bands with the neighbouring isotopes has also been made. Comparison of the models with experimental data shows good agreement. The configurations of some of the previously observed bands have been modified. Most importantly, the coupling of 2+ γ band to the 11/2+[615] neutron configuration is observed for the first time.
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    New collective structures in the Z=76 stable odd neutron nucleus, 187Os
    (University of Western Cape, 2021) Sithole, Makuhane Abel; Lawrie Elena
    Low- and medium-spin bands of 187Os have been studied using the AFRODITE array, following the 186W(4He,3n)187Os reaction at a beam energy of 37 MeV. The measurements of 􀀀 coincidences, angular distribution ratios (RAD), polarization and -intensities were performed using eleven High Purity Germanium (HPGe) clover detectors. In the current work, all the previously known bands have been signi cantly extended and ve new bands have been added to the level scheme. The observed bands are interpreted within the cranked shell model (CSM), cranked Nilsson-Strutinsky- Bogoliubov (CNSB) formalism and Quasiparticle-plus-Triaxial-Rotor (QTR) model. Systematic comparison of bands with the neighbouring isotopes has also been made. Comparison of the models with experimental data shows good agreement.