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Recent Submissions

  • Superfluid filaments of dipolar bosons in free space 

    Cinti, Fabio; Cappellaro, Alberto; Salasnich, Luca; Macri, Tommaso (American Physical Society, 2017)
    We systematically investigate the zero temperature phase diagram of bosons interacting via dipolar interactions in three dimensions in free space via path integral Monte Carlo simulations with a few hundreds of particles ...
  • Examination of evidence for collinear cluster tri-partition 

    Pyatkov, Yu. V.; Kamanin, D. V.; Alexandrov, A. A.; Alexandrova, I. A.; Goryainova, Z. I.; Malaza, V.; Mkaza, N.; Kuznetsova, E. A.; Strekalovsky, A. O.; Strekalovsky, O. V.; Zhuchko, V. E. (American Physical Society, 2017)
    Background: In a series of experiments at different time-of-flight spectrometers of heavy ions we have observed manifestations of a new at least ternary decay channel of low excited heavy nuclei. Due to specific features ...
  • Snake fangs : 3D morphological and mechanical analysis by microCT, simulation, and physical compression testing 

    Du Plessis, Anton; Broeckhoven, Chris; Le Roux, Stephan G. (Oxford University Press, 2018)
    This Data Note provides data from an experimental campaign to analyse the detailed internal and external morphology and mechanical properties of venomous snake fangs. The aim of the experimental campaign was to investigate ...
  • Emerging translational variance : vacuum polarization energy of the 𝜙6 kink 

    Weigel, H. (Hindawi, 2017-07-30)
    We propose an efficient method to compute the vacuum polarization energy of static field configurations that do not allow decomposition into symmetric and antisymmetric channels in one space dimension. In particular, we ...
  • Simple models of three coupled PT-symmetric wave guides allowing for third-order exceptional points 

    Schnabel, Jan; Cartarius, Holger; Main, Jorg; Wunner, Gunter; Heiss, Walter Dieter (Czech Technical University--Prague, 2017-08)
    We study theoretical models of three coupled wave guides with a PT-symmetric distribution of gain and loss. A realistic matrix model is developed in terms of a three-mode expansion. By comparing with a previously postulated ...
  • Proportional crosstalk for the iThemba LABS clover detector 

    Noncolela, S. P.; Bucher, T. D.; Lawrie, E. A.; Dinoko, T. R. S.; Easton, J. L.; Erasmus, N.; Lawrie, J. J.; Mthembu, S. H.; Mtshali, W. X.; Shirinda, O.; Orce, J. N. (Jagiellonian University, 2017-03)
    Measurements of the proportional crosstalk were performed for the iThemba LABS segmented clover detector. More than 1000 crosstalk parameters were determined and a crosstalk correction algorithm was implemented successfully.
  • Chiral bands in 193Tl 

    Ndayishimye, J.; Lawrie, E. A.; Shirinda, O.; Easton, J. L.; Wyngaardt, S. M.; Bark, R. A.; Bvumbi, S. P.; Dinoko, T. R. S.; Jones, P.; Kheswa, N. Y.; Lawrie, J. J.; Majola, S. N. T.; Masiteng, P. L.; Negi, D.; Orce, J. N.; Papka, P.; Sharpey-Schafer, J. F.; Stankiewicz, M.; Wiedeking, M. (Jagiellonian University, 2017-03)
    Since the introduction of chirality in nuclei, the search for chiral candidates in different mass regions has been a hot topic for about two decades. At iThemba LABS, a new chiral symmetry region, the thallium isotopes with ...
  • Optical tweezers for advanced microscopy 

    Erasmus, Anneke (Stellenbosch : Stellenbosch University, 2018-03)
    ENGLISH SUMMARY: The integration of lasers into microscopy has enabled new areas of research and expanded existing ones. Not only can one now image samples to resolutions and contrast unheard of before lasers became ...
  • Investigating the photo-induced ultrafast insulator-metal phase transition in organic Cu(DCNQI)2 salts by ultrafast electron diffraction 

    Smit, Albert Bart (Stellenbosch : Stellenbosch University, 2018-03)
    ENGLISH SUMMARY: This work presents the structural dynamics of the organic crystal Cu(DCNQI)2 (DCNQI: dicyanoquinonediimine) as it undergoes a photo-induced insulator-to-metal (IM) transition. Cu(DCNQI)2, a radical ion ...
  • Point spread function engineering for fluorescence microscopy 

    Holinirina Dina Miora, Ratsimandresy (Stellenbosch : Stellenbosch University, 2018-03)
    ENGLISH SUMMARY: A tool for biological imaging is developed within this work. It consists of engineering the point spread function (PSF) of a fluorescent molecule or a nanoparticle emitter by modulating the phase of the ...
  • New developments in the nuclear binary cluster-core in the heavy nuclear region 

    Kaya, Boniface Dimitri Christel Kimene (Stellenbosch : Stellenbosch University, 2018-03)
    ENGLISH ABSTRACT : The atomic nucleus is a complex many-body interacting system, which exhibits a underlying correlated set of nucleon states. The cluster model is one of the most reliable models that predicts the strongly ...
  • Non-commutative quantum mechanics in 3-dimensional fuzzy space and its applications 

    Groenewald, Hendrikus Wilhelm (Stellenbosch : Stellenbosch University, 2018-03)
    ENGLISH SUMMARY: As the structure of space-time at very short length scales comparable to the Planck length remains a contentious issue, this study aims to determine whether non-commutative space-time would prove to be ...
  • Photophysics and photovoltaic application of direct heteroarylation derived isoindigo based copolymers 

    Tegegne, Newayemedhin (Stellenbosch : Stellenbosch University, 2018-03)
    ENGLISH SUMMARY: Environmental friendliness, ease of fabrication, low cost and mechanical flexibility make organic solar cells a potential future of renewable energy sources. The structure of organic materials such as ...
  • A microscopic description of elastic scattering from unstable nuclei within a relativistic framework 

    Yahya, Wasiu Akanni (Stellenbosch : Stellenbosch University, 2018-03)
    ENGLISH SUMMARY: In this dissertation, a microscopic study of proton elastic scattering from unstable nuclei at intermediate energies using relativistic formalisms is presented. We have employed both the original ...
  • Bayesian parameter estimation for discrete data spectra 

    Wang, Li (Stellenbosch : Stellenbosch University, 2017-12)
    ENGLISH ABSTRACT : Discrete spectra are ubiquitous in physics; for example nuclear physics, laser physics and experimental high energy physics measure integer counts in the form of particles in dependence of angle, ...
  • Charge dynamics in hybrid and organic-inorganic light harvesting thin films followed with femtosecond transient absorption spectroscopy 

    Minda, Iulia (Stellenbosch : Stellenbosch University, 2017-12)
    ENGLISH ABSTRACT : In order to bridge the gap between traditional sources of electricity and the increasing global demand for it, as a society we must move towards renewable sources of energy such as solar radiation. ...
  • Noninvasive measurement of dynamic correlations in spin systems 

    Uhrich, Philipp Johann (Stellenbosch : Stellenbosch University, 2017-12)
    ENGLISH ABSTRACT : Dynamic correlations hψ| O1(t1)O2(t2)|ψi of quantum observables are useful quantities for the study of quantum dynamics. Attempts at measuring these correlations are however complicated, due to the ...
  • Studying the structural phase transition of organic Cu(DCNQI)2 with ultrafast electron diffraction 

    Payne, Nancy (Stellenbosch : Stellenbosch University, 2017-12)
    ENGLISH ABSTRACT : Organic molecular solids combine the richness of molecular and solid state physics. The structure and properties of organic solids can be modified to a great extent—for example, by utilising isotope ...
  • Field theory of reversible and active network formation 

    Pachong, Stanard Mebwe (Stellenbosch : Stellenbosch University, 2017-12)
    ENGLISH ABSTRACT : This dissertation presents a statistical physics analysis of randomly cross-linked polymer networks with both reversible and permanent cross-links. The theory used here is adapted from the field theory ...
  • Driven nonequilibrium systems modeled with Markov processes 

    Nyawo, Pelerine Tsobgni (Stellenbosch : Stellenbosch University, 2017-12)
    ENGLISH ABSTRACT : We study in this thesis the fluctuations of time-integrated functionals of Markov processes, which represent physical observables that can be measured in time for noisy systems driven in nonequilibrium ...

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