Recent Submissions

  • Radiation shielding design for sealed radioactive gamma-ray and neutron sources: measurements and modeling 

    Mahanyapane, Motlatsi Vincent (Stellenbosch : Stellenbosch University, 2022-04)
    ENGLISH ABSTRACT: Adequacy of the radiation shielding implemented for sealed radioactive sources used at the University was evaluated and improved. Three different setups were investi- gated; 1. neutron activation drum, ...
  • Quantum computing on cloud-based processors 

    Skosana, Unathi (Stellenbosch : Stellenbosch University, 2022-04)
    ENGLISH ABSTRACT: The noisy intermediate-scale quantum (NISQ) era refers to the current technological epoch permeated with quantum processors that are big enough (50-100 qubits) to be no longer trivially simulatable with ...
  • Image analysis and theory of spatially confined cytoskeletal filaments 

    Gouws, Christo (Stellenbosch : Stellenbosch University, 2022-04)
    ENGLISH ABSTRACT: An existing self-consistent approach to calculating density was used to model linear as well as branched polymer networks within a selection of confining re- gions with hard-boundaries. Density and ...
  • Motor protein transport on cytoskeleton networks 

    Dempers, Nadine (Stellenbosch : Stellenbosch University, 2022-04)
    ENGLISH ABSTRACT: Motor proteins are able to propel themselves along the, sometimes branched and intersecting, directed filaments of the cytoskeleton, dragging various organelles and vesicles to their required destinations ...
  • Vacuum polarization energy of a soliton with many internal degrees of freedom 

    Du Toit, Arne (Stellenbosch : Stellenbosch University, 2022-04)
    ENGLISH ABSTRACT: The main objective of this thesis is to numerically compute the vacuum polarization energy (VPE) of solitons in a multi-component model by means of spectral methods. The VPE is the leading quantum ...
  • Quantum optical modelling and experiments investigating the population evolution in atomic zinc and ytterbium-171 ions 

    Bester, Siann (Stellenbosch : Stellenbosch University, 2022-04)
    ENGLISH ABSTRACT: This project sets out to derive, adapt and apply the four state optical Bloch equations to two very different experimental scenarios which are studied in our research group. These include modelling the ...
  • Manufacturing and characterization of in-situ alloyed Ti6Al4V(ELI)-3 at.% Cu by laser powder bed fusion 

    Vilardell, A. M.; Yadroitsev, I.; Yadroitsava, I.; Albu, M.; Takata, N.; Kobashi, M.; Krakhmalev, P.; Kouprianoff, D.; Kothleitne, G.; Du Plessis, A. (Elsevier, 2020)
    Biofunctionalization of Ti6Al4V alloy with metallic agents like Ag or Cu is a promising approach to add anti-bacterial properties and thus to reduce the risk of implant failure. This research investigates the in-situ ...
  • Multi-spectral object tracking and prediction of kinematic quantities 

    Buckton, Calib Jonas (Stellenbosch : Stellenbosch University, 2021-12)
    ENGLISH ABSTRACT: The use of convolutional neural networks in object identification is well-documented and useful in a variety of applications. Particularly, when combined with a tracking algorithm such as SORT or DeepSORT, ...
  • Universal scaling and dynamics at quantum phase transitions in the Kitaev Chain 

    King, Emma Catherine (Stellenbosch : Stellenbosch University, 2021-12)
    ENGLISH ABSTRACT: Experimental advances in ultracold gases present physicists with the opportunity to explore a diverse range of new phenomena in a controllable manner. In turn, this has fuelled significant interest in ...
  • Resonant ionization spectroscopy for laser isotope separation of zinc isotopes 

    De Bruyn, Andre (Stellenbosch : Stellenbosch University, 2021-12)
    ENGLISH ABSTRACT: The vast zinc (Zn) reserves in South Africa are currently being underutilized, as the Zn ore refinement and isotope enrichment occurs abroad. The enrichment process most commonly used thus relies only ...
  • Investigation on the influence of the initial RDX crystal size on the performance of shaped charge warheads 

    Majiet, F.; Mostert, F. J. (KeAi Communications, 2019)
    Copper lined wave shaped shaped charges of particular design and liner metallurgy were used to investigate the effect of explosive crystal size on the resultant shaped charge jet parameters. Composition A3 with RDX of three ...
  • Rapid deconvolution of low-resolution time-of-flight data using Bayesian inference 

    Pieterse, Cornelius L.; De Kock, Michiel B.; Robertson, Wesley D.; Eggers, Hans C.; Miller, R. J. Dwayne (AIP Publishing LLC, 2019)
    The deconvolution of low-resolution time-of-flight data has numerous advantages, including the ability to extract additional information from the experimental data. We augment the well-known Lucy-Richardson deconvolution ...
  • The Structure of 33Si,35S and the magicity of the N = 20 gap at Z = 14; 16 

    Jongile, Sandile (Stellenbosch : Stellenbosch University, 2021-12)
    ENGLISH ABSTRACT: Nuclei along N = 20 provide an excellent region to investigate nuclear structure and interactions, with their evolution from the doubly magic nucleus 40Ca through the Z = 16 and Z = 14 nuclei 36S and ...
  • Re-estimation of 180Ta nucleosynthesis in light of newly constrained reaction rates 

    Malatji, K. L.; Wiedeking, M.; Goriely, S.; Brits, C. P.; Kheswa, B. V.; Bello Garrote, F. L.; Bleuel, D. L.; Giacoppo, F.; Gorgen, A.; Guttormsen, M.; Hadynska-Klek, K.; Hagen, T. W.; Ingeberg, V. W.; Klintefjord, M.; Larsen, A. C.; Papka, P.; Renstrom, T.; Sahin, E.; Siem, S.; Siess, L.; Tveten, G. M.; Zeiser, F. (Elsevier, 2019-03-12)
    Recent measurements of the nuclear level densities and γ-ray strength functions below the neutron thresholds in 180,181,182Ta are used as input in the nuclear reaction code TALYS. These experimental average quantities are ...
  • Interplay of dynamical and structure effects in the observables for 12C(p,2p) near 400 MeV with polarized and unpolarized beams 

    Mecca, A.; Cravo, E.; Deltuva, A.; Crespo, R.; Cowley, A. A.; Arriaga, A.; Wiringa, R. B.; Noro, T. (Elsevier, 2019-10-01)
    We investigate the interplay of reaction mechanism and structure effects in the calculated cross sections and polarization observables for the direct 12C(p, 2p)reaction near 400 MeV around the Quasi Free Scattering (QFS) ...
  • New candidate chiral nucleus in the A ≈ 80 mass region : 82 35 Br 47 

    Liu, C.; Wang, S. Y.; Qi, B.; Wang, S.; Sun, D. P.; Li, Z. Q.; Bark, R. A.; Jones, P.; Lawrie, J. J.; Masebi, L.; Wiedeking, M.; Meng, J.; Zhang, S. Q.; Hua, H.; Li, X. Q.; Li, C. G.; Han, R.; Wyngaardt, S. M.; Sun, B. H.; Zhu, L. H.; Bucher, T. D.; Kheswa, B. V.; Malatji, K. L.; Ndayishimye, J.; Shirinda, O.; Dinoko, T.; Khumalo, N.; Lawrie, E. A.; Ntshangase, S. S. (American Physical Society, 2019-11-07)
    A pair of nearly degenerate positive-parity bands were observed in 82 Br for the first time using the 82 Se(α,p3n) reaction. The positive-parity doublet bands are proposed to be chiral doublet bands based on the triaxial ...
  • “Stapler” mechanism for a dipole band in 79Se 

    Li, C. G.; Chen, Q. B.; Zhang, S. Q.; Xu, C.; Hua, H.; Wang, S. Y.; Bark, R. A.; Wyngaardt, S. M.; Shi, Z.; Dai, A. C.; Wang, C. G.; Li, X. Q.; Li, Z. H.; Meng, J.; Xu, F. R.; Ye, Y. L.; Jiang, D. X.; Han, R.; Niu, C. Y.; Chen, Z. Q.; Wu, H. Y.; Wang, X.; Luo, D. W.; Wu, C. G.; Wang, S.; Sun, D. P.; Liu, C.; Li, Z. Q.; Sun, B. H.; Jones, P.; Msebi, L.; Sharpey-Schafer, J. F.; Dinoko, T.; Lawrie, E. A.; Ntshangase, S. S.; Kheswa, B. V.; Shirinda, O.; Khumalo, N.; Bucher, T. D.; Malatji, K. L. (American Physical Society, 2019-10-24)
    The spectroscopy of 79 Se is studied via the 82 Se(α, α3n)79Se fusion-evaporation reaction. A negative-parity magnetic dipole band in 79Se is established for the first time. Based on the calculations by the self-consistent ...
  • β and γ bands in N = 88 , 90, and 92 isotones investigated with a five-dimensional collective Hamiltonian based on covariant density functional theory : vibrations, shape coexistence, and superdeformation 

    Majola, S. N. T.; Shi, Z.; Song, B. Y.; Li, Z. P.; Zhang, S. Q.; Bark, R. A.; Sharpey-Schafer, J. F.; Aschman, D. G.; Bvumbi, S. P.; Bucher, T. D.; Cullen, D. M.; Dinoko, T. S.; Easton, J. E.; Erasmus, N.; Greenlees, P. T.; Hartley, D. J.; Hirvonen, J.; Korichi, A.; Jakobsson, U.; Jones, P.; Jongile, S.; Julin, R.; Juutinen, S.; Ketelhut, S.; Kheswa, B. V.; Khumalo, N. A.; Lawrie, E. A.; Lawrie, J. J.; Lindsay, R.; Madiba, T. E.; Makhathini, L.; Maliage, S. M.; Maqabuka, B.; Malatji, K. L.; Masiteng, P. L.; Mashita, P. I.; Mdletshe, L.; Minkova, A.; Msebi, L.; Mullins, S. M.; Ndayishimye, J.; Negi, D.; Netshiya, A.; Newman, R.; Ntshangase, S. S.; Ntshodu, R.; Msebi, L.; Mullins, S. M.; Ndayishimye, J.; Negi, D.; Netshiya, A.; Newman, R.; Ntshangase, S. S.; Ntshodu, R.; Nyako, B. M.; Papka, P.; Peura, P.; Rahkila, P.; Riedinger, L. L.; Riley, M. A.; Roux, D. G.; Ruotsalainen, P.; Saren, J. J.; Scholey, C.; Shirinda, O.; Sithole, M. A.; Sorri, J.; Stankiewicz, M.; Stolze, S.; Timar, J.; Uusitalo, J.; Vymers, P. A.; Wiedeking, M.; Zimba, G. L. (American Physical Society, 2019-06-05)
    A comprehensive systematic study is made for the collective β and γ bands in even-even isotopes with neutron numbers N = 88 to 92 and proton numbers Z = 62 (Sm) to 70 (Yb). Data, including excitation energies, B(E0) and ...
  • Generation of a frequency-degenerate four-photon entangled state using a silicon nanowire 

    Feng, Lan-Tian; Zhang, Ming; Zhou, Zhi-Yuan; Chen, Yang; Li, Ming; Dai, Dao-Xin; Ren, Hong-Liang; Guo, Guo-Ping; Guo, Guang-Can; Tame, Mark; Ren, Xi-Feng (Nature Research, 2019)
    Integrated photonics is becoming an ideal platform for generating two-photon entangled states with high brightness, high stability, and scalability. This high brightness and high quality of photon pair sources encourages ...
  • Thermalization of a Lipkin-Meshkov-Glick model coupled to a bosonic bath 

    Louw, Jan C.; Kriel, Johannes N.; Kastner, Michael (American Physical Society, 2019)
    We derive a Lindblad master equation that approximates the dynamics of a Lipkin-Meshkov-Glick (LMG) model weakly coupled to a bosonic bath. By studying the time evolution of operators under the adjoint master equation we ...

View more