Browsing by Subject "Monte Carlo"

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    Charged Vector Boson (W ±) production in simulated proton-proton collisions at √s = 5.36 TeV.
    (2025) Potgieter, Jakobus; Buthelezi, Zinhle; Fortsch, Siegfried; Dietel, Thomas
    In this work, the focus is on the charged vector boson (W ±) production in the forward rapidity region of simulated relativistic proton-proton collisions, where the POWHEG and Pythia Monte Carlo (MC) event generators are used to simulate the events of interest for the analysis. The W ± boson production is studied via the muonic decay channel as W ± → μ±+νμ (–). It is theoretically motivated in the work that this process can serve as a probe of the initial state of the collision, since the W ± boson is produced in the hardest partonic interaction and neither the W ± boson nor the μ± have a colour charge. The muonic decay of heavy-flavour (HF) mesons in the same forward rapidity region is also investigated, where it is shown that these processes serve as the dominant background for the muon production from W ± boson decays. The primary charged-particle multiplicity is also introduced as an observable of interest, where the self-normalised W ± boson production as a function of the normalised multiplicity is defined and studied specifically. For this observable, it is shown that a linear trend is obtained when estimating the multiplicity in the central rapidity region and using the default Monash Tune. The choice of the central region for the multiplicity estimation is clearly motivated by looking at auto-correlation effects - which are shown to effect the slope of the multiplicity observable. In addition, it is shown that the slope of the multiplicity observable is also sensitive to the multi-parton interaction (MPI) and colour reconnection (CR) models - which motivates the use of the observable to probe the initial-state of the collision. Finally, a feasibility study is also performed to investigate whether the same study can be done with the ALICE Run 3 proton-proton reference data at the same centre-of-mass energy - where an estimation of the available statistics for the W ± → μ±+νμ (–) process is presented. Through the work, it is also argued that the study in proton-proton collisions can serve as a meaningful baseline measurements for other collision systems - such as proton-lead and lead-lead.
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    Computational physics resources - topic 1 - basic Monte Carlo
    (2013) Wheaton, Spencer
    A collection of resources (simulations and worksheets) focusing on basic Monte Carlo techniques. These materials are suited for guided-inquiry instruction at the senior undergraduate or honours level.
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    Sequential regression multiple imputation for incomplete multivariate data using Markov Chain Monte Carlo
    (Southern Africa Labour and Development Research Unit, 2015-05-28) Lacerda, M.; Ardington, Cally; Leibbrandt, Murray
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    Validation and verification of FLUKA for neutron shielding problems
    (2022) Dondolo, Petrus; Hutton, Tanya; Leadbeater, Thomas
    Monte Carlo-based radiation transport codes provide an opportunity to simulate situations with various levels of activation and different induced nuclides. However, to test their reliability, it is important to verify the simulation codes by comparing them with experimental data. In this study, validation of simulation models with experiments was performed with the purpose of determining the reliability of the simulation/experimental results. Concrete is the most generally used shield material as it is inexpensive and adjustable for any construction design. Radiation shielding properties of concrete may vary depending on the concrete composites. In this thesis, the fluences (i.e. the flux integrated over time) of neutrons impinging on the shielding nuclear material were studied using FLUKA Monte Carlo package. The rectangular blocks of shielding nuclear materials such as concrete ingredients: cement, sand and water were irradiated with a beam of 14 MeV neutrons and the shielding properties of these materials were investigated using FLUKA Monte Carlo simulation code. The simulation set-up replicates the experimental measurements performed within the nuclear laboratory in the Department of Physics at the University of Cape Town. The comparison of the effective removal cross-section shows a good agreement between experiments and FLUKA. The results from these two approaches show general agreement for sand and cement, but show some minor deviations for water and concrete. The source of these deviations is discussed, along with potential solutions. FLUKA has been well benchmarked and validated against other Monte Carlo codes. The discrepancies obtained on water and concrete may have occurred from the material properties in the input file. Comparisons of results are presented and the discrepancies and agreements between the two methods are discussed for these target materials. The effective removal cross section of a concrete mix was measured by simulation to be 0.1038 +/- 0.0005 cm-1 and by experiment to be 0.1230 +/- 0.0002 cm-1 of 14 MeV neutrons. This illustrates a broad agreement between experiment and simulation in the case of concrete ingredients. Validation and comparison of measured and simulated neutron irradiation on concrete ingredients shows good agreement, supporting the use of FLUKA for estimating the neutron transmission into the shielding material.