A5046005558- Nuclear physics research studies
- Nuclear Physics and Applications
- Astronomical and nuclear sciences
- Nuclear reactor physics and engineering
- Atomic and Molecular Physics
- Advanced Chemical Physics Studies
- Radiation Shielding Materials Analysis
- X-ray Spectroscopy and Fluorescence Analysis
- Perovskite Materials and Applications
- Rare-earth and actinide compounds
- Gamma-ray bursts and supernovae
- Quantum Chromodynamics and Particle Interactions
- Nuclear materials and radiation effects
- Advanced NMR Techniques and Applications
- Innovative Teaching Methods
- Radioactive Decay and Measurement Techniques
- Neutrino Physics Research
- Conducting polymers and applications
- Advanced X-ray and CT Imaging
- Radiation Dose and Imaging
- Education and Critical Thinking Development
- Academic integrity and plagiarism
- Chalcogenide Semiconductor Thin Films
- Astrophysical Phenomena and Observations
- Metallurgical and Alloy Processes
University of Oslo
2014-2025
University of Johannesburg
2017-2025
University of the Western Cape
2014-2024
iThemba Laboratory
2013-2023
National Research Foundation
2013-2023
Stellenbosch University
2013-2023
Shandong University
2019
Proton-<a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mi>γ</a:mi></a:math> coincidences from <b:math xmlns:b="http://www.w3.org/1998/Math/MathML"><b:mrow><b:mo>(</b:mo><b:mi>d</b:mi><b:mo>,</b:mo><b:mi>p</b:mi><b:mo>)</b:mo></b:mrow></b:math> reactions between a <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"><c:mmultiscripts><c:mi>Ni</c:mi><c:mprescripts/><c:none/><c:mn>66</c:mn></c:mmultiscripts></c:math> beam and deuterated polyethylene target have been analyzed with the...
The γ-ray strength functions and nuclear level densities of 138La 139La have been measured below the neutron separation energies. These new data were used to calculate astrophysical Maxwellian-averaged (n,γ) cross-sections investigate production destruction p-nucleus in photodisintegration process. results confirm underproduction p-process with respect observed abundances strongly support ν-process through νe capture on 138Ba as main contributor synthesis Type II supernovae.
The experimental gamma-ray strength functions (gamma-SFs) of 142,144-151Nd have been studied for energies up to the neutron separation energy. results represent a unique set gamma-SFs an isotopic chain with increasing nuclear deformation. data reveal how low-energy enhancement, scissors mode and pygmy dipole resonance evolve deformation mass number. indicate that mechanisms behind enhancement are decoupled from each other.
The KSnI3 based perovskite solar cells have attracted a lot of research interest due their unique electronic, optical, and thermal properties. In this study, we optimized the performance various lead-free cell structures—specifically, FTO/Al-ZnO/KSnI3/rGO/Se, FTO/LiTiO2/KSnI3/rGO/Se, FTO/ZnO/KSnI3/rGO/Se, FTO/SnO2/KSnI3/rGO/Se, using SCAPS-1D simulation tool. optimization focused on thicknesses dopant densities rGO, KSnI3, Al-ZnO, LiTiO2, ZnO, SnO2 layers, as well thickness FTO electrode....
KSnI3-based perovskite solar cells have attracted a lot of research interest due their unique electronic, optical, and thermal properties. In this study, we optimized the performance various lead-free cell structures-specifically, FTO/Al-ZnO/KSnI3/rGO/Se, FTO/LiTiO2/KSnI3/rGO/Se, FTO/ZnO/KSnI3/rGO/Se, FTO/SnO2/KSnI3/rGO/Se, using SCAPS-1D simulation tool. The optimization focused on thicknesses dopant densities rGO, KSnI3, Al-ZnO, LiTiO2, ZnO, SnO2 layers, thickness FTO electrode, as well...
The $\ensuremath{\gamma}$-ray strength functions and level densities of $^{73,74}\mathrm{Ge}$ have been extracted up to the neutron-separation energy ${S}_{n}$ from particle-$\ensuremath{\gamma}$ coincidence data using Oslo method. Moreover, function $^{74}\mathrm{Ge}$ above has determined photoneutron measurements; hence these two experiments cover range ${\mathrm{E}}_{\ensuremath{\gamma}}\ensuremath{\approx}1$--13 MeV for $^{74}\mathrm{Ge}$. obtained show that both display an increase in...
Two nearly degenerate positive-parity bands with the πg9/22⊗νg9/2−1 configuration and three negative-parity πg9/2(p3/2,f5/2)⊗νg9/2−1 have been identified in 81Kr. They are interpreted as chiral doublet pseudospin-chiral triplet bands, which is supported by constrained covariant density functional theory multiparticle plus rotor model calculations. The present work reports two new configurations πg9/2(p3/2,f5/2)⊗νg9/2−1, first example of involving π(p3/2,f5/2) pseudospin doublet.
Nuclear level densities and γ-ray strength functions of 56,57Fe have been extracted from proton-γ coincidences. A low-energy enhancement in the up to a factor 30 over common theoretical E1 models is confirmed. Angular distributions 57Fe indicate its dipole nature, agreement with findings for 56Fe. The high statistics excellent energy resolution large-volume LaBr3(Ce) detectors allowed thorough analysis γ as function excitation energy. Taking into account presence strong Porter–Thomas...
Abstract The $$\gamma $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>γ</mml:mi></mml:math> -ray strength function ( SF) and nuclear level density (NLD) have been extracted for the first time from inverse kinematic reactions with Oslo method. This novel technique allows measurements of these properties across a wide range previously inaccessible nuclei. Proton– coincidence events $$\mathrm {d}(^{86}\mathrm {Kr}, \mathrm {p}\gamma )^{87}\mathrm {Kr}$$...
Abstract Lead (Pb)-based materials are very effective in radiation shielding due to their high density of Pb. However, they pose health risks humans because the toxicity lead. As a result, investigation properties various lead-free glass has drawn lot attention from researchers. In this work, γ competence Bi 2 O 3 –ZnO–B –SiO network was investigated, for first time 0.015–15 MeV energy range, using Phy-X/PSD and XCOM software systems. The results showed that 45Bi –5ZnO–20B –30SiO sample...
The nuclear level densities and $\gamma$-ray strength functions of $^{138,139,140}$La were measured using the $^{139}$La($^{3}$He, $\alpha$), $^{3}$He$^\prime$) $^{139}$La(d, p) reactions. particle-$\gamma$ coincidences recorded with silicon particle telescope (SiRi) NaI(Tl) (CACTUS) arrays. In context these experimental results, low-energy enhancement in A$\sim$140 region is discussed. $^{137,138,139}$La($n, \gamma)$ cross sections calculated at $s$- $p$-process temperatures experimentally...
Photoneutron cross sections were measured for $^{58}\mathrm{Ni},^{60}\mathrm{Ni},^{61}\mathrm{Ni}$, and $^{64}\mathrm{Ni}$ at energies between the one-neutron two-neutron thresholds using quasimonochromatic $\ensuremath{\gamma}$-ray beams produced in laser Compton scattering NewSUBARU synchrotron radiation facility. These photoneutron data are used to extract strength function above neutron threshold, complementing information obtained by Oslo method below threshold. We discuss radiative...
Recent measurements of the nuclear level densities and γ-ray strength functions below neutron thresholds in 180,181,182Ta are used as input reaction code TALYS. These experimental average quantities utilized calculations 179,180,181Ta radiative capture cross sections. From latter, astrophysical Maxwellian-averaged (n,γ) sections (MACS) rates extracted, which turn large network to probe production mechanism 180Ta. performed for two scenarios, s-process 180,181Ta Asymptotic Giant Branch (AGB)...
The nuclear level densities of $^{194-196}$Pt and $^{197,198}$Au below the neutron separation energy have been measured using transfer scattering reactions. All density distributions follow constant-temperature description. Each group isotopes is characterized by same temperature above threshold corresponding to breaking first Cooper pair. A constant entropy excess $\Delta S=1.9$ $1.1$ $k_B$ observed in $^{195}$Pt $^{198}$Au with respect $^{196}$Pt $^{197}$Au, respectively, giving...
Isospin properties of dipole excitations in 74 Ge are investigated using the ({\alpha},{\alpha}'{\gamma}) reaction and compared to ({\gamma},{\gamma}) data. The results indicate that energy region 6 9 MeV adhere scenario recently found splitting into two separated parts: one at low energy, being populated by both isoscalar isovector probes, other high excited only electromagnetic probe. Relativistic quasiparticle time blocking approximation (RQTBA) calculations show a reduction E1 strength...
Understanding the evolution of level densities in crossover from spherical to well-deformed nuclei has been a long-standing problem nuclear physics. We measure for chain neodymium isotopes $^{142,144-151}$Nd which exhibit such crossover. These results represent date most complete data set an isotopic between neutron shell-closure and towards mid-shell. observe strong increase along with overall by factor $\approx 170$ at excitation energy 7.5 MeV saturation around mass 150. Level calculated...
The nuclear level densities (NLDs) and the $\ensuremath{\gamma}$-ray strength functions ($\ensuremath{\gamma}\mathrm{SFs}$) of $^{153,155}\mathrm{Sm}$ have been extracted from ($d,p\ensuremath{\gamma}$) coincidences using Oslo method. experimental NLD $^{153}\mathrm{Sm}$ is higher than $^{155}\mathrm{Sm}$, in accordance with microscopic calculations. $\ensuremath{\gamma}\mathrm{SFs}$ are fair agreement QRPA calculations based on D1M Gogny interaction. An enhancement observed...
A comprehensive systematic study is made for the collective β and γ bands in even-even isotopes with neutron numbers N=88 to 92 proton Z=62(Sm) 70 (Yb). Data, including excitation energies, B(E0) B(E2) values, branching ratios from previously published experiments are collated new data presented first time this study. The experimental compared calculations using a five-dimensional Hamiltonian (5DCH) based on covariant density functional theory (CDFT). realistic potential quadrupole shape...
A pair of nearly degenerate positive-parity bands were observed in $^{82}\mathrm{Br}$ for the first time using $^{82}\mathrm{Se}(\ensuremath{\alpha},p3n)$ reaction. The doublet are proposed to be chiral based on triaxial particle rotor model and potential energy surface calculations. root-mean-square values angular momentum components their probability distributions discussed detail exhibit geometry its evolution $^{82}\mathrm{Br}$.
Particle-$\ensuremath{\gamma}$ coincidence experiments were performed at the Oslo Cyclotron Laboratory with $^{181}\mathrm{Ta}(d,X)$ and $^{181}\mathrm{Ta}(^{3}\mathrm{He},X)$ reactions to measure nuclear level densities (NLDs) $\ensuremath{\gamma}$-ray strength functions ($\ensuremath{\gamma}\mathrm{SFs}$) of $^{180,181,182}\mathrm{Ta}$ using method. The back-shifted Fermi-gas, constant temperature plus Fermi gas, Hartree-Fock-Bogoliubov combinatorial models used for absolute normalizations...
Abstract In this study, the X-ray shielding competence of 15Bi 2 O 3 + 75H BO 10Sm , 10Nd and 10CeO glasses was investigated using Phy-X/PSD simulation software validated XCOM software. The Sm 3+ -doped bismuth-borate glass gave highest linear attenuation coefficients effective atomic number, lowest half-value layer, tenth-value mean free path. Thus, it is most radiation material compared to Nd - Ce 4+ glasses. It also observed that has better radiation-shielding than various systems have...
In this work, we present new data on the $^{182,183,184}\mathrm{W}(\ensuremath{\gamma},n$) cross sections, utilizing a quasi-monochromatic photon beam produced at NewSUBARU synchrotron radiation facility. Further, have extracted nuclear level density and $\ensuremath{\gamma}$-ray strength function of $^{186}\mathrm{W}$ from $^{186}\mathrm{W}(\ensuremath{\alpha},{\ensuremath{\alpha}}^{\ensuremath{'}}\ensuremath{\gamma})^{186}\mathrm{W}$ reaction measured Oslo Cyclotron Laboratory. Combining...
Abstract This work reports the first rotational bands observed in neutron-deficient nucleus $$^{231}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow/> <mml:mn>231</mml:mn> </mml:msup> </mml:math> U. Excited states were populated $$^{232}$$ <mml:mn>232</mml:mn> Th( $$\alpha $$ <mml:mi>α</mml:mi> ,5n) reaction at a beam energy of 52 MeV. Coincident decay $$\gamma <mml:mi>γ</mml:mi> -rays measured with high-purity germanium detectors afrodite spectrometer array,...
Abstract In this research, we employed SCAPS-1D simulation software to numerically optimize the performance of four CsSnBr3-based perovskite solar cell structures. Specifically, analyzed FTO/ZnO/CsSnBr3/rGO/Se, FTO/AlZnO/CsSnBr3/rGO/Se, FTO/LiTiO2/CsSnBr3/rGO/Se, and FTO/WS2/CsSnBr3/rGO/Se configurations. The optimization process focused on adjusting thicknesses electron transport layer, hole while also evaluating effects temperature, series resistance, shunt resistance Jsc, Voc, FF, PCE. As...