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  • 1. Jonsell, Svante
    et al.
    Saenz, Alejandro
    Froelich, Piotr
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical and Analytical Chemistry, Quantum Chemistry.
    Zygelman, Bernard
    Dalgarno, Alex
    Including the strong nuclear force in antihydrogen-scattering calculations2005In: Canadian journal of physics (Print), ISSN 0008-4204, E-ISSN 1208-6045, Vol. 83, no 4, p. 435-445Article in journal (Refereed)
    Abstract [en]

    We investigate two methods to include the strong nuclear force in hydrogen-antihydrogen scattering calculations. First, we construct a model optical potential with parameters determined by the measured shift and width of the protonium ground state. Although this potential is a very crude model for the strong nuclear force, its parameters may be adjusted to reproduce both bound states and low-energy annihilation cross sections to within the experimental accuracy. It is then shown that this potential may be reduced to a short-distance boundary condition in terms of the proton-antiproton strong-interaction scattering length. Elastic and annihilation cross sections for ground-state hydrogen-antihydrogen scattering are calculated for s- and p-waves, and collision energies up to 1 atomic unit. The two methods are found to agree to within about 1%. The main source of discrepancy is that the scattering-length approach does not account for vacuum polarization, relativistic, and finite-size corrections. We verify that the range of the strong interaction potential does not affect the hydrogen-antihydrogen s-wave scattering properties, and that the strong interaction has negligible influence on p-wave scattering.

  • 2. Schuch, R.
    et al.
    Johansson, A.
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry, Materials Chemistry.
    Kumar, R. T. R.
    Sahana, M. B.
    Skog, P.
    Soroka, I. L.
    Vikor, Gy.
    Zhang, H. Q.
    Guiding of highly charged ions through insulating nanocapillaries2008In: Canadian journal of physics (Print), ISSN 0008-4204, E-ISSN 1208-6045, Vol. 86, no 1, p. 327-330Article in journal (Refereed)
    Abstract [en]

    The guiding of highly charged ions through nanocapillaries in different insulating materials, such as polyethylene terephthalate, SiO2, and Al2O3 has been investigated by our group, using 7 keV Ne7+ ions. We find transmission of ions incident at angles larger than the angle given by the capillary aspect ratio in all these materials. The measured angular distributions, however, vary with the membrane material. In this report we compare the experimental findings with the different membranes.

  • 3.
    Sisman, Altug
    Istanbul Technical University, Nuclear Energy Institute.
    High Temperature Corrections For The Classical Expressions Of Radiative Losses From A Black-Body1999In: Canadian journal of physics (Print), ISSN 0008-4204, E-ISSN 1208-6045, Vol. 77, no 5, p. 343-351Article in journal (Refereed)
    Abstract [en]

    The contribution from thermally generated electron–positron pairs to the radiativelosses from a black body is considered near the temperature corresponding to the electron’srest mass energy Tc= mec2/k. The correction factors are defined as the ratio of correctedexpressions (which also include the contribution from thermal pairs) to the classical expressions(which include merely photons). The correction factors for energy, free energy, and entropyfluxes have different values about 0.5Tc, while they have the same value at T << Tc and T >> Tc. The Stephan–Boltzmann’s constant becomes temperature dependent due to thecontribution of thermal pairs. According to the classical expressions of radiative losses, the ratioof energy flux to the absolute value of free energy flux is a constant and it is equal to 3. On thecontrary, it is shown that it is a function of temperature about Tc and it has a maximum about0.38Tc. The correction factor for mean energy per emitted thermal particle has also a maximumabout T = 0.42Tc.

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