Browsing Research Articles (Physics) by Title
Now showing items 120 of 33

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 ... 
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 ... 
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 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 ... 
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 ... 
Heavy baryons with strangeness in a soliton model
(Elsevier, 201509)We present results from a chiral soliton model calculation for the spectrum of baryons with a single heavy quark (charm or bottom) and nonzero strangeness. We treat the strange components within a three flavor collective ... 
Higherorder interference and singlesystem postulates characterizing quantum theory
(Institute of Physics, 20141210)We present a new characterization of quantum theory in terms of simple physical principles that is different from previous ones in two important respects: first, it only refers to properties of single systems without any ... 
Influence of gas discharge parameters on emissions from a dielectric barrier discharge excited argon excimer lamp
(ASSAF  Academy of Science of South Africa, 201111)A dielectric barrier discharge excited neutral argon (Ar I) excimer lamp has been developed and characterised. The aim of this study was to develop an excimer lamp operating at atmospheric pressure that can replace mercury ... 
Internal cumulants for femtoscopy with fixed charged multiplicity
(Hindawi Publishing Corporation, 2013)A detailed understanding of all effects and influences on higherorder correlations is essential. At low charged multiplicity, the effect of a nonPoissonian multiplicity distribution can significantly distort correlations. ... 
International astronomer Phil Charles meets the ire of the National Research Foundation
(Academy of Science of South Africa (ASSAf), 201003)Recent weeks have seen an embarrassing display of heavyhanded National Research Foundation (NRF) management in connection with the Square Kilometer Array (SKA) project – a new $2 billion radio astronomy facility to be ... 
Internet access constrains science development and training at South African universities
(Academy of Science of South Africa (ASSAf), 201109)As a group of young scientists whose future careers depend increasingly on access to Internet resources, we are extremely concerned by the apparent lack of understanding of the stranglehold that current approaches to ... 
Interplay of soundcone and supersonic propagation in lattice models with power law interactions
(Bristol : IOP Publishing, 20150616)Westudy the spreading of correlations and other physical quantities in quantum lattice models with interactions or hopping decaying like r−α with the distance r.Our focus is on exponents α between 0 and 6, where the ... 
Laboratory Xray microcomputed tomography : a user guideline for biological samples
(Oxford University Press, 2015)Laboratory Xray microcomputed tomography (microCT) is a fast growing method in scientific research applications that allows for nondestructive imaging of morphological structures. This paper provides an easily operated ... 
Nonperturbative flow equations from running expectation values
(American Physical Society (APS), 200308)We show that Wegner’s flow equations, as recently discussed in the Lipkin model, can be solved selfconsistently. This leads to a nonlinear differential equation which fully determines the order parameter as a function ...