Browsing Department of Physics and Astronomy by Title
Now showing items 140-159 of 238
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Nonlinear optical properties of natural dyes based on optical resonance
(University of the Western Cape, 2012)Recent research shows that the study of optical properties of organic material natural dyes has gained much consideration. The specific functional groups in several natural dyes remain essential for the large nonlinear ... -
Nuclear level densities and gamma-ray strength functions in Ta isotopes and nucleo-synthesis of ¹⁸ᴼTa
(University of the Western Cape, 2016)Most stable and extremely low abundance neutron deficient nuclei with Z ≥ 34 are referred to as p-nuclei. Nearly all p-nuclei with A < 110 are most likely produced in the rp-process while almost all A > 110 are thought ... -
Nuclear structure studies in the A=136 region using transfer reactions
(University of the Western Cape, 2018)This thesis describes research work undertaken to study neutron pairing correlations in 136Ba via the 138Ba(p, t) pair transfer reaction and to perform high-precision spectroscopy of low-lying states in 136Cs using the ... -
The observed bispectrum for SKA and other galaxy surveys
(University of the Western Cape, 2019)Next-generation galaxy surveys will usher in a new era of high precision cosmology. They will increasingly rely on the galaxy bispectrum to provide improved constraints on the key parameters of a cosmological model to ... -
Octupole and quadrupole structures in the N=88 nucleus 152Gd
(University of the Western Cape, 2018)The focus for this work is on 152Gd produced by the 150Sm( , 2n)152Gd reaction at a beam energy of 25 MeV. The nucleus has been previously studied for both low spin states and high spin states at di erent energies. The ... -
Optical emission spectroscopy of laser induced plasmas containing carbon and transitional metals
(University of the Western Cape, 2008)The spectroscopic, SEM and Raman measurements on carbon nanotubes under the exact conditions of which OES analysis were made showed that at a pressure of 400 Torr and a flow rate of 200 sccm, the quality and quantity of ... -
Optical modeling of amorphous and metal induced crystallized silicon with an effective medium approximation
(University of the Western Cape, 2009)In this thesis we report on the metal-mediated-thermally induced changes of the structural and optical properties of hydrogenated amorphous silicon deposited by hot-wire CVD, where aluminium and nickel were used to induce ... -
Optical properties of annealed hydrogenated amorphous silicon nitride (a-SiNx:H) thin films for photovoltaic application
(2013)Technological advancement has created a market for large area electronics such as solar cells and thin film transistors (TFT’s). Such devices now play an important role in modern society. Various types of conducting, ... -
Optimization of lead halide perovskite thin films by chemical vapour deposition
(University of Western Cape, 2021)Perovskite solar cells have gained tremendous attention within the past decade, due to its rapid improvement in power conversion e ciency (PCE), with the current record cell at 25%. The aim of this study is to create ... -
Out of thermodynamic equilibrium reaction of zinc-molybdenum system monitored by real-time rutherford backscattering spectrometry
(University of the Western Cape, 2022)Solid phase reaction of bi-metallic thin films of zinc-molybdenum was thermally induced in order to investigate the diffusion kinetics of this bi-metallic system. The Zinc-Molybdenum bilayers were prepared by depositing ... -
(p.n.) Reactions on 59co in the intermediate energy range
(University of the Western Cape, 1992)Detailed theoretical investigations [Chi80,Mos82,Kle85] of (p,n) and (p,p') data indicate that the reaction mechanisms operative at intermediate energies and for energy losses up to several tens of MeV are predominantly ... -
Perturbations of dark energy models
(University of Western Cape, 2012)The growth of structure in the Universe proceeds via the collapse of dark matter and baryons. This process is retarded by dark energy which drives an accelerated expansion of the late Universe. In this thesis we use ... -
Photo-physical properties of lead-tin binary Perovskite thin films
(University of Western Cape, 2021)Organic-inorganic lead-based perovskite has exhibited great performance in the past few years. However, the lead (Pb) embedded in those compounds is a significant drawback to further progress, due to its environmental ... -
Physical properties of vanadium dioxide nanoparticles: application as 1-d nanobelts room temperature for hydrogen gas sensing
(University of the Western Cape, 2013)Transition metal oxides magneli phases present crystallographic shear structure which is of great interest in multiple applications because of their wide range of valence, which is exhibited by the transition metals. The ... -
Physics graduate preparedness for work and society
(University of the Western Cape, 2023)Both internationally and in South Africa, there have been renewed debates about the purposes of higher education and the attributes that should be developed in graduates. In the field of physics, many studies have reported ... -
Plasma characterisation of an electron cyclotron resonance ion source by means of x-ray spectroscopy
(University of the Western Cape, 2012)The ultimate aim of any multiply-charged ion source, like the Electron Cyclotron Resonance Ion Source, ECRIS, is the production of multiply-charged ions, in sufficiently large quantities. These multiplycharged ions, in the ... -
Point source simulations and Foreground cleaning techniques for HI intensity mapping
(University of the Western Cape, 2018)We created a full sky point source catalogue at frequencies around 1 GHz, including the intensity, polarisation, rotation measure and spectral index of the point source. These values were matched to data where available ... -
Polarizability effects due to low-energy enhancement of the gamma-strength function
(University of the Western Cape, 2018)Physics is the study of natural phenomena. Nuclear physicists have since the discovery of the nucleus been working on understanding its dynamics. The nuclear chart, analogous to the periodic table of elements, is illustrated ... -
Post-deposition doping of silicon nanowires
(University of the Western Cape, 2018)Silicon nanowires (Si NWs) continue to demonstrate superior properties to their bulk counterparts, with respect to their morphological and electrical transport properties for the use in photovoltaic (PV) applications. ... -
Pre-equilibrium cross section calculations with a realistic effective nucleon-nucleon interaction
(University of the Western Cape, 1995)The principle aim of this work is to improve the way in which pre-equilibrium double differential cross-sections are currently calculated [1, 2, 3, 4]. The theoretical basis for these calculations is the Multistep Direct ...