6 research outputs found
Coupling of single neutron configurations to collective core excitations in 162Yb using 163Yb
Magister Scientiae - MSc (Physics)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
New collective structures in the Z=76 stable odd neutron nucleus, 187Os
Philosophiae Doctor - PhDLow- 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
New Collective structures in the Z=76 stable odd neutron nucleus, 187Os
Philosophiae Doctor - PhDLow- 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
Encapsulated Sulfur targets for light ion beam experiments
A new method was developed to produce enriched Sulfur targets with minimum loss of material. This was made possible by inserting Sulfur in-between two 0.5 μm Mylar foils (C10H8O4). The initial aim was to ensure that the Sulfur targets reduce by no more than 50% of the initial thickness within 24 hours under the equivalent of 10 J/cm2 of integrated energy deposition by an energetic (Eb > 50 MeV) proton beam. There is no loss of enriched material while making the target, as all the material is deposited within the surface area to be exposed to the beam. During beam irradiation, the targets were frequently swivelled in order to expose each part of the target to the beam and achieve homogeneous irradiation. Targets of 0.4 mg/cm2 thickness were produced and characterised using ion beam analysis technique with a 3 MeV proton beam
Encapsulated Sulfur targets for light ion beam experiments
International audienceA new method was developed to produce enriched Sulfur targets with minimum loss of material. This was made possible by inserting Sulfur in-between two 0.5 μm Mylar foils (C10H8O4). The initial aim was to ensure that the Sulfur targets reduce by no more than 50% of the initial thickness within 24 hours under the equivalent of 10 J/cm2 of integrated energy deposition by an energetic (Eb > 50 MeV) proton beam. There is no loss of enriched material while making the target, as all the material is deposited within the surface area to be exposed to the beam. During beam irradiation, the targets were frequently swivelled in order to expose each part of the target to the beam and achieve homogeneous irradiation. Targets of 0.4 mg/cm2 thickness were produced and characterised using ion beam analysis technique with a 3 MeV proton beam
Encapsulated Sulfur targets for light ion beam experiments
A new method was developed to produce enriched Sulfur targets with minimum loss of material. This was made possible by inserting Sulfur in-between two 0.5 μm Mylar foils (C10H8O4). The initial aim was to ensure that the Sulfur targets reduce by no more than 50% of the initial thickness within 24 hours under the equivalent of 10 J/cm2 of integrated energy deposition by an energetic (Eb > 50 MeV) proton beam. There is no loss of enriched material while making the target, as all the material is deposited within the surface area to be exposed to the beam. During beam irradiation, the targets were frequently swivelled in order to expose each part of the target to the beam and achieve homogeneous irradiation. Targets of 0.4 mg/cm2 thickness were produced and characterised using ion beam analysis technique with a 3 MeV proton beam