Browsing Research Articles (Physics) by Title

Now showing items 1-20 of 32

    • Chiral bands in 193Tl 

      Ndayishimye, J.; Lawrie, E. A.; Shirinda, O.; Easton, J. L.; Wyngaardt, S. M.; Bark, R. A.; Bvumbi, S. P.; Dinoko, T. R. S.; Jones, P.; Kheswa, N. Y.; Lawrie, J. J.; Majola, S. N. T.; Masiteng, P. L.; Negi, D.; Orce, J. N.; Papka, P.; Sharpey-Schafer, J. F.; Stankiewicz, M.; Wiedeking, M. (Jagiellonian University, 2017-03)
      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 ...

    • Defect-induced supersolidity with soft-core bosons 

      Cinti, F.; Macri, T.; Lechner, W.; Pupillo, G.; Pohl, T. (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 

      Angeletti, Florian; Touchette, Hugo (AIP, 2016-02)
      A Markov process fluctuating away from its typical behavior can be represented in the long-time limit by another Markov process, called the effective or driven process, having the same stationary states as the original ...

    • Distorted-wave Born approximation study of the 11Li(p,t) 9Li reaction 

      Cowley, A. A. (IOP Publishing, 2016)
      The reaction 11Li(p,t) 9Li(gs) at an incident energy of 4 MeV is treated in terms of a simplistic distorted-wave Born approximation transfer. The halo neutrons involved in the reaction are treated as a di-neutron cluster ...

    • Duality constructions from quantum state manifolds 

      Kriel, J. N.; Van Zyl, H. J. R.; Scholtz, F. G. (Springer, 2015-11-20)
      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 non-relativistic quantum systems. These state ...

    • Emerging translational variance : vacuum polarization energy of the 𝜙6 kink 

      Weigel, H. (Hindawi, 2017-07-30)
      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 ...

    • Entanglement-enhanced spreading of correlations 

      Kastner, Michael (IOP Publishing, 2015-12-17)
      Starting from a product initial state, equal-time correlations in nonrelativistic quantum lattice models propagate within a light cone-like causal region. The presence of entanglement in the initial state can modify this ...

    • Examination of evidence for collinear cluster tri-partition 

      Pyatkov, Yu. V.; Kamanin, D. V.; Alexandrov, A. A.; Alexandrova, I. A.; Goryainova, Z. I.; Malaza, V.; Mkaza, N.; Kuznetsova, E. A.; Strekalovsky, A. O.; Strekalovsky, O. V.; Zhuchko, V. E. (American Physical Society, 2017)
      Background: In a series of experiments at different time-of-flight 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 ...

    • Exchange-induced crystallization of soft-core bosons 

      Cinti, Fabio; Boninsegni, Massimo; Pohl, Thomas (Institute of Physics, 2014-03-28)
      We study the phase diagram of a two-dimensional assembly of bosons interacting via a soft-core 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 light-harvesting complexes from extractions of spinach leaves 

      Ombinda-Lemboumba, S.; Du Plessis, A.; Sparrow, R. W.; Molukanele, P.; Botha, L. R.; Rohwer, E. G.; Steenkamp, C. M.; Van Rensburg, L. (Academy of Science of South Africa (ASSAf), 2009-10)
      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 

      Kheswa, B. V.; Wiedeking, M.; Giacoppo, F.; Goriely, S.; Guttormsen, M.; Larsen, A. C.; Bello Garrote, F. L.; Eriksen, T. K.; Gorgen, A.; Hagen, T. W.; Koehler, P. E.; Klintefjord, M.; Nyhus, H. T.; Papka, P.; Renstrom, T.; Rose, S.; Sahin, E.; Siem, S.; Tornyi, T. (Elsevier, 2015)
      The γ-ray 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 Maxwellian-averaged (n, γ) cross-sections ...

    • Heavy baryons with strangeness in a soliton model 

      Blanckenberg, J. P.; Weigel, H. (Elsevier, 2015-09)
      We present results from a chiral soliton model calculation for the spectrum of baryons with a single heavy quark (charm or bottom) and non-zero strangeness. We treat the strange components within a three flavor collective ...

    • Higher-order interference and single-system postulates characterizing quantum theory 

      Barnum, Howard; Muller, Markus P.; Ududec, Cozmin (Institute of Physics, 2014-12-10)
      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 

      Baricholo, Peter; Hlatywayo, Dumisani J.; Von Bergmann, Hubertus M.; Stehmann, Timo; Rohwer, Erick; Collier, Mike (ASSAF -- Academy of Science of South Africa, 2011-11)
      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 

      Eggers, H. C.; Buschbeck, B. (Hindawi Publishing Corporation, 2013)
      A detailed understanding of all effects and influences on higher-order correlations is essential. At low charged multiplicity, the effect of a non-Poissonian multiplicity distribution can significantly distort correlations. ...

    • International astronomer Phil Charles meets the ire of the National Research Foundation 

      Bohm, Lothar (Academy of Science of South Africa (ASSAf), 2010-03)
      Recent weeks have seen an embarrassing display of heavy-handed 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 

      Slippers, Bernard; Majozi, Thokozani; Nelwamondo, Fulufhelo V.; Steenkamp, Christine M.; Van Heerden, Esta; Wright, Caradee Y. (Academy of Science of South Africa (ASSAf), 2011-09)
      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 

      Storch, David-Maximilian; Van den Worm, Mauritz; Kastner, Michael (Bristol : IOP Publishing, 2015-06-16)
      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 X-ray micro-computed tomography : a user guideline for biological samples 

      Du Plessis, Anton; Broeckhoven, Chris; Guelpa, Anina; Le Roux, Stephan Gerhard (Oxford University Press, 2015)
      Laboratory X-ray micro-computed tomography (micro-CT) is a fast growing method in scientific research applications that allows for non-destructive imaging of morphological structures. This paper provides an easily operated ...

    • Nonperturbative flow equations from running expectation values 

      Scholtz, F. G.; Bartlett, Bruce H.; Geyer, H. B. (American Physical Society (APS), 2003-08)
      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 ...