• Quantum corrections to the kink-antikink potential 

      Lee, Zander (Stellenbosch : Stellenbosch University, 2017-03)
      ENGLISH ABSTRACT : In quantum field theory vacuum polarization effects may drastically alter the classical properties of non-perturbative field configurations. This is especially the case when comparing the vacuum ...
    • A quantum hall effect without landau levels in a quasi one dimensional system 

      Brand, Janetta Debora (Stellenbosch : Stellenbosch University, 2012-12)
      ENGLISH ABSTRACT: The experimental observation of the quantum Hall effect in a two-dimensional electron gas posed an intriguing question to theorists: Why is the quantization of conductance so precise, given the imperfections ...
    • Quantum information theory 

      Schumann, Robert Helmut (Stellenbosch : Stellenbosch University, 2000-12)
      ENGLISH ABSTRACT: What are the information processing capabilities of physical systems? As recently as the first half of the 20th century this question did not even have a definite meaning. What is information, and how ...
    • Relativistic mean-field theory applied to the study of neutron star properties 

      Diener, Jacobus Petrus Willem (Stellenbosch : Stellenbosch University, 2008-03)
      Nuclear physics can be applied in various ways to the study of neutron stars. This thesis reports on one such application, where the relativistic mean-field approximation has been employed to calculate the equations of ...
    • Relativistic quantum mechanics on non-commutative spaces 

      Williams, Paul Henry (Stellenbosch : Stellenbosch University, 2015-12)
      ENGLISH ABSTRACT: A brief review of non-relativistic and relativistic quantum mechanics is carried out, with particular attention to concepts that are modified in the noncommutative setting. The Hilbert-Schmidt operator ...
    • Resonance ionization spectroscopy with time of flight mass spectrometry 

      Waso, Frederick John (Stellenbosch : Stellenbosch University, 2019-04)
      ENGLISH ABSTRACT : Resonance ionization using laser light is one of the most useful techniques for isolating radioactive isotopes and producing radioactive ion beams at accelerator facilities around the world. The aim of ...
    • Response of NaI(T1) detectors in geophysical applications 

      Titus, Nortin P. (Stellenbosch : Stellenbosch University, 2005-03)
      ENGLISH ABSTRACT: Airborne gamma-ray spectrometry is used for exploration and environmental monitoring over large areas. Such datasets of 7-ray are acquired using large 16l NaI(T1) detector crystals mounted in an aircraft. ...
    • The Role of a direct knock-out mechanism in the inclusive (p, α) reaction 

      Van Zyl, Johannes Jacobus (Stellenbosch : University of Stellenbosch, 2008-03)
      Experimental double differential cross sections and analyzing powers for the inclusive 93 Nb(p,α) r and 93 Nb(p, 3He) r reactions have been measured at an incident energy of 160 MeV. The results of this experiment, for ...
    • Scattering in soliton models and crossing symmetry 

      Abdelhady, A. M. H. H. (Stellenbosch : Stellenbosch University, 2012-12)
      ENGLISH ABSTRACT: Crossing symmetry relates scattering and annihilation processes to each other. Its derivation is straightforward in perturbative approaches to quantum field theory: it merely reflects the exchange of ...
    • Search for the scissors resonance in 182Ta 

      Brits, Christiaan Petrus (Stellenbosch : Stellenbosch University, 2016-12)
      ENGLISH ABSTRACT :Relatively small changes to the overall shape of the photon strength function such as the scissors or pygmy resonances can have a significant impact on reaction rates. Reaction rates are important for ...
    • Self-organised criticality and seismicity 

      Boonzaaier, Leandro (Stellenbosch : Stellenbosch University, 2002-12)
      ENGLISH ABSTRACT: In this thesis we give an overview of self-organised criticality and its application to studying seismicity. We recall some of the basic models and techniques for studying self-organised critical systems. ...
    • Short-pulse generation in a diode-end-pumped solid-state laser 

      Ngcobo, Sandile (Stellenbosch : University of Stellenbosch, 2010-03)
      ENGLISH ABSTRACT: This thesis consists of two parts; the first part is a discussion on the detailed history of the development of different types of modelocked lasers, especially the neodymium-doped lasers. The second ...
    • Single molecule diffusion in polymeric systems 

      Sibanda, Charmaine (Stellenbosch : Stellenbosch University, 2019-04)
      ENGLISH ABSTRACT : The dynamics of thin polymeric systems were studied in this research work using the diffusion of single fluorescent molecules observed by single molecule fluorescence microscopy. A wide field single ...
    • Spectral and temporal modulation and characterization of femtosecond ultra-short laser pulses 

      Mbanda Nsoungui, Gaelle Carine (Stellenbosch : Stellenbosch University, 2012-12)
      ENGLISH ABSTRACT: Ultra-short laser pulses are useful in materials processing like melting and cutting metals, and medical applications such as surgery and many other fields. In this study, we characterize and control ...
    • Spectral characteristics of stimulated Raman scattered radiation in a waveguide 

      Du Plessis, Johann Altenburg (Stellenbosch : Stellenbosch University, 1992-01)
      ENGLISH ABSTRACT: The spectral characteristics of stimulated Raman scattered radiation in a waveguide was investigated using a laser as source of pump radiation. The pump laser is focused into the waveguide to obtain a ...
    • Spectral characterization of materials using terahertz time domain spectroscopy (THz-TDS) 

      Hissen, Huzifa Zain Alabdeen Abdarahman (Stellenbosch : Stellenbosch University, 2014-12)
      ENGLISH ABSTRACT: Terahertz (THz) radiation is often used in many promising applications such as information and communication technology and airport security. Optimized and adapted terahertz fields hold huge promise for ...
    • Spectroscopy of atomic zinc inside a heat pipe: Towards resonance ionisation 

      Hattingh, Brandon Dane (Stellenbosch : Stellenbosch University, 2019-04)
      ENGLISH ABSTRACT : Zinc (Zn) reserves in South Africa are not being used to full potential. Separating Zn into its different stable isotopes drastically increases its value, as well as usefulness in certain areas such ...
    • Statistical thermodynamics of long-range quantum spin systems 

      Olivier, G. J. F. (Gerrit Jacobus Francois) (Stellenbosch : Stellenbosch University, 2012-03)
      ENGLISH ABSTRACT:In this thesis we discuss some of the anomalies present in systems with long-range interactions, for instance negative specifc heat and negative magnetic susceptibility, and show how they can be related ...
    • Strange particle production via the weak interaction 

      Adera, Gashaw Bekele (Stellenbosch : University of Stellenbosch, 2009-03)
      In this thesis a general relativistic formalism for neutrino-induced weak production of strange particles is presented. In our formalism it is shown that the differential cross section is constructed as a contraction ...
    • Structural dynamics of 1T-TiSe2 using femtosecond electron diffraction 

      Suleiman, Aminat Oyiza (Stellenbosch : Stellenbosch University, 2014-12)
      ENGLISH ABSTRACT: Trilayered transition metal dichalcogenides such as our sample (1T-TiSe2) have been studied for many years as systems with strong electron-electron and electron-phonon correlations. The main attraction ...