A5087473567- Nuclear physics research studies
- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Atomic and Molecular Physics
- Advanced Chemical Physics Studies
- Astronomical and nuclear sciences
- Nuclear Physics and Applications
- Advanced NMR Techniques and Applications
- Dark Matter and Cosmic Phenomena
- Nuclear reactor physics and engineering
- Muon and positron interactions and applications
- Atomic and Subatomic Physics Research
- Superconducting Materials and Applications
- Radiation Detection and Scintillator Technologies
- Particle accelerators and beam dynamics
- Gamma-ray bursts and supernovae
- Rare-earth and actinide compounds
- CCD and CMOS Imaging Sensors
- Particle Detector Development and Performance
- Mass Spectrometry Techniques and Applications
- Planetary Science and Exploration
- Crystallography and Radiation Phenomena
- High-pressure geophysics and materials
- Radiation Effects in Electronics
McGill University
2022-2025
University of the Western Cape
2016-2024
Stellenbosch University
2023
Centre National de la Recherche Scientifique
2022-2023
Université Claude Bernard Lyon 1
2023
Institut de Physique des 2 Infinis de Lyon
2022
Institut National de Physique Nucléaire et de Physique des Particules
2022
University of Zululand
2020
National Research Foundation
2020
Several experiments around the world are looking for a new particle, named Dark Boson, which may do link between Ordinary Matter (which forms basically stars, planets, interstellar gas...) and Hidden Sectors of Universe. This if it exists, would act as messenger fundamental interaction nature. In this paper, underlying theory will be introduced first. A non-exhaustive summary experimental studies carried out to date foreseen in incoming years presented after,including 8 Be anomaly. The last...
Carbon burning is a key step in the evolution of massive stars, Type 1a supernovae and superbursts x-ray binary systems. Determining $^{12}\mathrm{C}+^{12}\mathrm{C}$ fusion cross section at relevant energies by extrapolation direct measurements challenging due to resonances below Coulomb barrier. A study $^{24}\mathrm{Mg}(\ensuremath{\alpha},{\ensuremath{\alpha}}^{\ensuremath{'}})^{24}\mathrm{Mg}$ reaction has identified several ${0}^{+}$ states $^{24}\mathrm{Mg}$, close threshold, which...
The $\mathrm{^{16}O}(\alpha, \alpha^{\prime})$ reaction was studied at $\theta_{lab} = 0^\circ$ an incident energy of $\textrm{E}_{lab}$ 200 MeV using the K600 magnetic spectrometer iThemba LABS. Proton and $\alpha$-decay from natural parity states were observed in a large-acceptance silicon-strip detector array backward angles. coincident charged particle measurements used to characterize decay channels $0_{6}^{+}$ state $\mathrm{^{16}O}$ located $E_{x} 15.097(5)$ MeV. This is identified by...
We used the $^{138}\mathrm{Ba}(d,\ensuremath{\alpha})$ reaction to carry out an in-depth study of states in $^{136}\mathrm{Cs}$, up around 2.5 MeV. In this Letter, we place emphasis on hitherto unobserved below first ${1}^{+}$ level, which are important context solar neutrino and fermionic dark matter (FDM) detection large-scale xenon-based experiments. identify for time candidate metastable would allow a real-time FDM events xenon detectors, with high background suppression. Our results...
We used a high-resolution magnetic spectrograph to study neutron pair-correlated $0^+$ states in $^{136}$Ba, produced via the $^{138}{\rm Ba}(p,t)$ reaction. In conjunction with state-of-the-art shell model calculations, these data benchmark part of dominant Gamow-Teller component nuclear matrix element (NME) for $^{136}$Xe neutrinoless double beta ($0\nu\beta\beta$) decay. demonstrate first time an evaluation $0\nu\beta\beta$ decay NME by use experimental observable, presenting new avenue...
Background: Inelastic proton scattering at energies of a few hundred MeV and very-forward angles including $0^\circ$ has been established as tool to study electric-dipole strength distributions in nuclei. The present work reports systematic investigation the chain stable even-mass Nd isotopes representing transition from spherical quadrupole-deformed Purpose: Extraction equivalent photo-absorption cross sections analysis their fine structure energy region IsoVector Giant Dipole Resonance...
Background: In highly deformed nuclei, there is a noticeable coupling of the isoscalar giant monopole resonance (ISGMR) and K=0 component quadrupole (ISGQR), which results in double peak structure (IS0) strength (a narrow low-energy deformation-induced main broad ISGMR part). The energy low-lying IS0 sensitive to both incompressibility modulus K∞ between (IS2) strength. Purpose: This study aims investigate two-peaked prolate Mg24 oblate Si28 nuclei identify among variety density functionals...
Excited states in 98Ru were investigated using γ-ray spectroscopy following the β-decay of 98Rh, and via 100Ru(p,t) reaction. Combining results from two experiments, revised to have spin-parity 4+ subsequently assigned 02+ "γ" bands, respectively. The observed structures are suggested be deformed rotational, rather than spherical vibrational, fit well into systematics these excitations Ru isotopes. excitation is as a shape coexisting configuration. This observation eliminates some last...
We used the 8$\pi$ $\gamma$-ray spectrometer at TRIUMF-ISAC radiocative ion beam facility to obtain high-precision branching ratios for $^{19}$Ne $\beta^+$ decay excited states in $^{19}$F. Together with other previous work, our measurements determine superallowed $1/2^+ \to 1/2^+$ beta branch ground state $^{19}$F be 99.9878(7)\%, which is three times more precise than known previously. The implications of these testing a variety weak interaction symmetries are discussed briefly.
Background: Nuclei in the $sd$ shell demonstrate a remarkable interplay of cluster and mean-field phenomena. The $N=Z$ nuclei, such as $^{24}\mathrm{Mg}$ $^{28}\mathrm{Si}$, have been focus theoretical study both phenomena past. A variety different structures these nuclei are predicted, characterized by isoscalar dipole monopole transitions. For example, low-energy vortical states were predicted $^{24}\mathrm{Mg}$. can be probed excitation scattering particles deuterons or...
We performed a high resolution study of ${0}^{+}$ states in $^{134}\mathrm{Ba}$ using the $^{136}\mathrm{Ba}(p,t)$ two-neutron transfer reaction. Our experiment shows significant portion $L=0$ pair-transfer strength concentrated at excited levels $^{134}\mathrm{Ba}$. Potential implications context $^{136}\mathrm{Xe}\phantom{\rule{4pt}{0ex}}\ensuremath{\rightarrow}\phantom{\rule{4pt}{0ex}}^{136}\mathrm{Ba}$ neutrinoless double beta decay matrix element calculations are briefly discussed.
The low-lying excited states in 136Cs relevant to the double beta decay of 136Xe were studied via a 138Ba(d, α)136Cs transfer reaction with high resolution magnetic spectrometer. Preliminary results from experiment are presented.
Background: Type I x-ray bursts provide an opportunity to constrain the equation of state nuclear matter. Observations light curves from these allow compactness neutron stars be constrained. However, behavior also depends on a number important thermonuclear reaction rates. One reactions, $^{18}\mathrm{Ne}(\ensuremath{\alpha},p)^{21}\mathrm{Na}$, has been extensively studied but there is some tension between rate calculated spectroscopic information states above $\ensuremath{\alpha}$-particle...
Background: The $^{136}$Ba isotope is the daughter nucleus in $^{136}$Xe $\beta\beta$ decay. It also lies a shape transitional region of nuclear chart, making it suitable candidate to test variety models. Purpose: To obtain spectroscopic information on states $^{136}$Ba, which will allow better understanding its low-lying structure. These data may prove useful constrain future $\to$ neutrinoless decay matrix element calculations. Methods: A $^{138}\mathrm{Ba}(p,t)$ reaction was used populate...
The isobaric multiplet mass equation (IMME) relates the masses of an isospin quadratically, and it plays important role in studies nuclear structure, astrophysics, fundamental symmetries. This work uses shell-model calculations, together with data from ${}^{32}$Ar $\ensuremath{\beta}$ decay ${}^{32}$S(${}^{3}$He,$t$) experiments to provide step explaining observed IMME violation $A=32$, $T=2$ quintet. It is shown that a small but finite cubic term required for this case due $T=1$ mixing....
Recent high-precision mass measurements and shell-model calculations [M. Brodeur et al., Phys. Rev. Lett. 108, 212501 (2012)] have challenged a longstanding explanation for the requirement of cubic isobaric multiplet equation lowest $A=9$ isospin quartet. The conclusions relied upon choice excitation energy second $T=3/2$ state in $^{9}\mathrm{B}$, which had two conflicting prior to this work. We remeasured using $^{9}\mathrm{Be}(^{3}\mathrm{He},t)$ reaction significantly disagree with most...
Background: Inelastic $\ensuremath{\alpha}$-particle scattering at energies of a few hundred MeV and very-forward angles including 0\ifmmode^\circ\else\textdegree\fi{} has been established as tool for the study isoscalar giant monopole (IS0) strength distributions in nuclei. This compressional mode nuclear excitation can be used to derive incompressibility matter.Purpose: An independent investigation IS0 nuclei across wide mass range was performed using ${0}^{\ensuremath{\circ}}$ facility...
Over the past two decades high energy-resolution inelastic proton scattering studies were used to gain an understanding of origin fine structure observed in isoscalar giant quadrupole resonance (ISGQR) and isovector dipole (IVGDR). Recently, monopole (ISGMR) $^{58}$Ni, $^{90}$Zr, $^{120}$Sn $^{208}$Pb was studied at iThemba Laboratory for Accelerator Based Sciences (iThemba LABS) by means $\alpha$-particle very forward angles (including $0\circ$). The good energy resolution measurement...
Background: Over the past two decades high energy-resolution inelastic proton scattering studies were used to gain an understanding of origin fine structure observed in isoscalar giant quadrupole resonance (ISGQR) and isovector dipole (IVGDR). Recently, monopole (ISGMR) 58Ni, 90Zr, 120Sn, 208Pb was studied at iThemba Laboratory for Accelerator Based Sciences (iThemba LABS) by means α-particle very forward angles (including 0∘). The good energy resolution measurement revealed significant...
We use a high-resolution $^{32}\mathrm{S}(d,t)$ measurement to investigate the claimed existence of 6401(3) keV state in $^{31}\mathrm{S}$ that may affect $^{30}\mathrm{P}(p,\ensuremath{\gamma})$ nuclear reaction rate oxygen-neon (ONe) novae. Our data are shown exclude null hypothesis---that does not exist---with high significance. Additionally, also suggest hitherto unreported at 6648(4) keV. This corresponds resonance 517(4) keV, located below higher edge Gamow window for peak nova...
The 2019 Mazurian Lakes Conference on Physics was held in Piaski, a vacation resort located at the lake of Bełdany heart Great District, from 1 st to 7 th September 2019.It 36 meeting series initiated over 50 years ago, 1968, by Professor Zdzisław Wilhelmi and his students collaborators.Throughout these years, conferences have gained world-wide reputation for their high scientific merit unique atmosphere.