Browsing Research Articles (Physics) by Title
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Attractive electromagnetic Casimir stress on a spherical dielectric shell
(Elsevier, 2013)Based on calculations involving an idealized boundary condition, it has long been assumed that the stress on a spherical conducting shell is repulsive. We use the more realistic case of a Drude dielectric to show that the ... 
Characterization of the proposed 4−α cluster state candidate in ¹⁶O
(American Physical Society, 2017)The 0¹⁶O(α,α′) reaction was studied at θlab=0∘ at an incident energy of Elab=200 MeV using the K600 magnetic spectrometer at iThemba LABS. Proton decay and α decay from the natural parity states were observed in a ... 
Chiral bands in 193Tl
(Jagiellonian University, 201703)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 ... 
A class of spatiotemporal and causal stochastic processes, with application to multiscaling and multifractality
(Academy of Science for South Africa, 2005)We present a general class of spatiotemporal stochastic processes describing the causal evolution of a positivevalued field in space and time. The field construction is based on independently scattered random measures ... 
Classical and quantum filaments in the ground state of trapped dipolar Bose gases
(American Physical Society, 2017)We study, by quantum Monte Carlo simulations, the ground state of a harmonically confined dipolar Bose gas with aligned dipole moments and with the inclusion of a repulsive twobody potential of varying range. Two different ... 
Consistency between SU(3) and SU(2) covariant baryon chiral perturbation theory for the nucleon mass
(Elsevier, 2017)Treating the strange quark mass as a heavy scale compared to the light quark mass, we perform a matching of the nucleon mass in the SU(3) sector to the twoflavor case in covariant baryon chiral perturbation theory. The ... 
Defectinduced supersolidity with softcore bosons
(Nature Publishing Group, 2014)More than 40 years ago, Andreev, Lifshitz and Chester suggested the possible existence of a peculiar solid phase of matter, the microscopic constituents of which can flow superfluidly without resistance due to the formation ... 
Diffusions conditioned on occupation measures
(AIP, 201602)A Markov process fluctuating away from its typical behavior can be represented in the longtime limit by another Markov process, called the effective or driven process, having the same stationary states as the original ... 
Distortedwave Born approximation study of the 11Li(p,t) 9Li reaction
(IOP Publishing, 2016)The reaction 11Li(p,t) 9Li(gs) at an incident energy of 4 MeV is treated in terms of a simplistic distortedwave Born approximation transfer. The halo neutrons involved in the reaction are treated as a dineutron cluster ... 
Duality constructions from quantum state manifolds
(Springer, 20151120)The formalism of quantum state space geometry on manifolds of generalised coherent states is proposed as a natural setting for the construction of geometric dual descriptions of nonrelativistic quantum systems. These state ... 
Emerging translational variance : vacuum polarization energy of the 𝜙6 kink
(Hindawi, 20170730)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 ... 
Entanglementenhanced spreading of correlations
(IOP Publishing, 20151217)Starting from a product initial state, equaltime correlations in nonrelativistic quantum lattice models propagate within a light conelike causal region. The presence of entanglement in the initial state can modify this ... 
Examination of evidence for collinear cluster tripartition
(American Physical Society, 2017)Background: In a series of experiments at different timeofflight 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 ... 
Examining the role of protein structural dynamics in drug resistance in Mycobacterium tuberculosis
(Royal Society of Chemistry, 2017)Antimicrobial resistance represents a growing global health problem. The emergence of novel resistance mechanisms necessitates the development of alternative approaches to investigate the molecular fundamentals of resistance, ... 
Exchangeinduced crystallization of softcore bosons
(Institute of Physics, 20140328)We study the phase diagram of a twodimensional assembly of bosons interacting via a softcore repulsive pair potential of varying strength, and compare it to that of the equivalent system in which particles are regarded ... 
Femtosecond laser diagnostics of thin films, surfaces and interfaces
(Academy of Science for South Africa, 2005)An overview is given of optical second harmonic generation (SHG) using femtosecond laser pulses to analyse technologically important crystalline materials. The principle of SHG is briefly explained and a typical experimental ... 
Femtosecond pump probe spectroscopy for the study of energy transfer of lightharvesting complexes from extractions of spinach leaves
(Academy of Science of South Africa (ASSAf), 200910)Measurements of ultrafast transient processes, of temporal durations in the picosecond and femtosecond regime, are made possible by femtosecond pump probe transient absorption spectroscopy. Such an ultrafast pump probe ... 
Fully selfconsistent relativistic BruecknerHartreeFock theory for finite nuclei
(American Physical Society, 2017)Starting from the relativistic form of the Bonn potential as a bare nucleonnucleon interaction, the full relativistic BruecknerHartreeFock (RBHF) equations are solved for finite nuclei in a fully selfconsistent basis. ... 
Galactic production of 138La : Impact of 138,139La statistical properties
(Elsevier, 2015)The γray strength functions and nuclear level densities of 138La and 139La have been measured below the neutron separation energies. These new data were used to calculate astrophysical Maxwellianaveraged (n, γ) crosssections ... 
Glass transitions in monodisperse clusterforming ensembles : vortex matter in type1.5 superconductors
(American Physical Society, 2017)At low enough temperatures and high densities, the equilibrium configuration of an ensemble of ultrasoft particles is a selfassembled, ordered, cluster crystal. In the present Letter, we explore the outofequilibrium ...