Department of Physics

Recent Submissions

  • Proton pencil beam kernels as extracted from Geant4 Monte Carlo simulations 

    Chisapi, Maluba Vernon J (Stellenbosch : Stellenbosch University, 2016-12)
    ENGLISH ABSTRACT : The contribution of primary protons, secondary protons, heavy recoil ions, and other secondary particles to the total energy deposited in water by a proton pencil beam (in the therapeutic energy regime) ...

  • Elemental Analysis of Mosses and Lichens from the Western Cape (South Africa) using INAA and ICP-MS 

    Ndlovu, Ntombizikhona Beaulah (Stellenbosch : Stellenbosch University, 2016-12)
    ENGLISH ABSTRACT : Mosses and lichens, analyzed by nuclear and related techniques, have been extensively used as biomonitors in the European countries to provide information about air quality, but not in South Africa. ...

  • Ultrafast photochromism in metal-organic complexes 

    Von Stein, P.-F. Xavier (Stellenbosch : Stellenbosch University, 2016-12)
    ENGLISH ABSTRACT : Dithizone (H2Dz), an analytical reagent typically used in colourimetric analysis, reacts with various transition metals to form metal dithizonate complexes. These complexes display strong absorption ...

  • Search for the scissors resonance in 182Ta 

    Brits, Christiaan Petrus (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 ...

  • Charge carrier effects in free standing Si membranes investigated by linear and second harmonic optical techniques 

    Ndebeka, Wilfrid Innocent (Stellenbosch : Stellenbosch University, 2016-12)
    ENGLISH ABSTRACT : Silicon (Si) based materials have been of technological importance throughout the years and today silicon remains a leading material in microelectronics industries. The silicon/silicon dioxide (Si/SiO2) ...

  • Cave front tracking experiment 

    Green, Mark (Stellenbosch : Stellenbosch University, 2016-12)
    ENGLISH ABSTRACT : Seismic tomography, a procedure to trace seismic wave velocity variation, has been used for more than 100 years to “see through rock”. Initially the recording of seismic waves from natural sources ...

  • Heavy baryons with strangeness in a soliton model 

    Blanckenberg, J. P.; Weigel, H. (Elsevier, 2015-09)
    We present results from a chiral soliton model calculation for the spectrum of baryons with a single heavy quark (charm or bottom) and non-zero strangeness. We treat the strange components within a three flavor collective ...

  • Interplay of soundcone and supersonic propagation in lattice models with power law interactions 

    Storch, David-Maximilian; Van den Worm, Mauritz; Kastner, Michael (Bristol : IOP Publishing, 2015-06-16)
    Westudy the spreading of correlations and other physical quantities in quantum lattice models with interactions or hopping decaying like r−α with the distance r.Our focus is on exponents α between 0 and 6, where the ...

  • Higher-order interference and single-system postulates characterizing quantum theory 

    Barnum, Howard; Muller, Markus P.; Ududec, Cozmin (Institute of Physics, 2014-12-10)
    We present a new characterization of quantum theory in terms of simple physical principles that is different from previous ones in two important respects: first, it only refers to properties of single systems without any ...

  • Exchange-induced crystallization of soft-core bosons 

    Cinti, Fabio; Boninsegni, Massimo; Pohl, Thomas (Institute of Physics, 2014-03-28)
    We study the phase diagram of a two-dimensional assembly of bosons interacting via a soft-core repulsive pair potential of varying strength, and compare it to that of the equivalent system in which particles are regarded ...

  • Development of diode end-pumped Nd:YLF lasers at 1314 nm for high power operation 

    Botha, Roelf Cornelis (Stellenbosch : Stellenbosch University, 2016-03)
    ENGLISH ABSTRACT : Please refer to the full text abstract.

  • Novel implementation of a phase-only spatial light modulator for laser beam shaping 

    Burger, Liesl (Stellenbosch : Stellenbosch University, 2016-03)
    ENGLISH ABSTRACT : The phase-only spatial light modulator (SLM) has revolutionized the field of laser beam shaping. In this thesis we describe in detail the considerations necessary to build a “digital laser” which ...

  • Middle-infrared laser sources 

    Koen, Wayne Sean (Stellenbosch : Stellenbosch University, 2016-03)
    ENGLISH ABSTRACT : Both bulk solid-state mid-infrared lasers and amplifier systems based on Tm3+ and Ho3+, as well as mid-infrared optically pumped molecular gas lasers based on HBr were developed and studied. An efficient ...

  • Development and characterisation of a Nd:YAG pumped wavelength tunable VUV light source 

    Rigby, Charles Ian (Stellenbosch : Stellenbosch University, 2016-03)
    ENGLISH ABSTRACT : Please refer to the full text abstract.

  • Surface enhanced Raman spectroscopy (SERS) of amino acids 

    Pfukwa, Ngaatendwe Buhle Cathrine (Stellenbosch : Stellenbosch University, 2016-03)
    ENGLISH ABSTRACT : Raman spectroscopy (RS) is an invaluable technique for sample identification. This method requires little sample preparation and is not completely non-invasive. The intensity of Raman scattered light can ...

  • Development of a kHz optical remote sensing system for in situ insect monitoring 

    Gebru, Alem Kindeya (Stellenbosch : Stellenbosch University, 2016-03)
    ENGLISH ABSTRACT : In this work we have developed a kHz optical remote sensing system for in situ insect monitoring applications. This is an active and passive remote sensing system based on laser and sunlight. This system ...

  • Multiple chiral bands in 193Tl 

    Ndayishimye, Joram (Stellenbosch : Stellenbosch University, 2016-03)
    ENGLISH ABSTRACT : In order to extend knowledge about chirality in A ∼ 190 mass region, experiments were performed at iThemba LABS for γ−spectroscopy studies in 192,193Tl. Previous level scheme of 193Tl was considerably ...

  • Ultrafast dynamics of excitons in tetracene single crystals 

    Birech, Zephania; Schwoerer, Markus; Schmeiler, Teresa; Pflaum, Jens; Schwoerer, Heinrich (AIP Publishing LLC, 2014-03-18)
    Ultrafast exciton dynamics in free standing 200 nm thin tetracene single crystals were studied at room temperature by femtosecond transient absorption spectroscopy in the visible spectral range. The complex spectrally ...

  • The design and construction of an active-target detector for the study of the 20Ne(α,α’)20Ne* reaction 

    Brummer, Johann Wiggert (Stellenbosch : Stellenbosch University, 2015-12)

  • Structural dynamics in DCNQI salts and transition metal dichalcogenides studied by electron diffraction simulation 

    Olaoye, Olufemi Opeyemi (Stellenbosch : Stellenbosch University, 2015-12)
    ENGLISH ABSTRACT: An in-depth understanding of the working principles of and phenomena governing strongly correlated condensed matter materials has paved way for technological advancement in electronics in the recent ...

  • 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 ...

  • Biofilament interacting with molecular motors 

    Meylahn, Janusz Martin (Stellenbosch : Stellenbosch University, 2015-12)
    ENGLISH ABSTRACT: We study molecular motors moving along a filament or polymer using two different mathematical models in which motors are idealised as springs. In the first model we study the average and the fluctuations ...

  • Characterization of the pre-eminent 4-α cluster state candidate in 16O 

    Li, Kevin Ching Wei (Stellenbosch : Stellenbosch University, 2015-12)
    ENGLISH ABSTRACT: Please see full text for abstract

  • Collective coordinate description of kink-antikink interaction 

    Takyi, Ishmael (Stellenbosch : Stellenbosch University, 2015-12)
    ENGLISH ABSTRACT: In this thesis we explore resonance solutions in one space and one time dimensions in the nonlinear non-integrable ø⁴ and ø⁶ models. These resonances occur when the relative velocity between the kink ...

  • One-dimensional fluid model with oscillating, exponentially decaying pair interactions 

    Maziya, Gcina (Stellenbosch : Stellenbosch University, 2015-12)
    ENGLISH ABSTRACT: For a one-dimensional fluid model where the pair interaction potential between the molecules consists of a hard core and an exponential attraction, Kac has shown that the partition function can be ...

  • Generalized time-frequency representations and their application to quantum control 

    Smit, Andre Marius (Stellenbosch : Stellenbosch University, 2015-12)
    ENGLISH ABSTRACT: We present here a new generalized Time-Frequency-Represenation (TFR) for use in describing ultra-fast laser pulses. The TFR is developed in terms of Fourier- Hermite-Gauss (FHG) polynomials on a von ...

  • Aspects of femtosecond pulse shape transfer via difference frequency mixing 

    Botha, Gerda Nicolene (Stellenbosch : Stellenbosch University, 2015-12)
    ENGLISH ABSTRACT: We investigate the generation of shaped femtosecond pulses in the infrared spectral regime via a nonlinear process called di erence frequency mixing. First we develop a detailed model of the process, ...

  • Dynamics of long-range interacting quantum spin systems 

    Van den Worm, Mauritz (Stellenbosch : Stellenbosch University, 2015-12)
    ENGLISH ABSTRACT: In this thesis we study the time evolution of correlation functions in quantum lattice models in the presence of long-range interactions or hopping decaying asymptotically as a power law. For a large ...

  • Constructing dualities from quantum state manifolds 

    Van Zyl, Hendrik Jacobus Rust (Stellenbosch : Stellenbosch University, 2015-12)
    ENGLISH ABSTRACT: A constructive procedure to build gravitational duals from quantum mechanical models is developed with the aim of studying aspects of the gauge/gravity duality. The construction is simplified as far as ...

  • An investigation of a possible effect of reactor antineutrinos on the decay rate of 22Na 

    Van Rooy, Milton William (Stellenbosch : Stellenbosch University, 2015-04)
    ENGLISH ABSTRACT: Reported claims of a solar neutrino influence on radioactive β - -decay rates prompted a series of three long term measurements that were carried out at the Koeberg nuclear power plant North of Cape ...

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