Joachim Reinhardt

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We calculate tractable microscopic expressions for the low-shear normal-stress coefficients of colloidal dispersions. Although restricted to the low rate regime, the presented formulas are valid for all volume fractions below the glass transition and for any interaction potential. Numerical results are presented for a system of colloids interacting via a(More)
A fundamental assumption of the dynamical density functional theory (DDFT) of colloidal systems is that a grand-canonical free-energy functional may be employed to generate the thermodynamic driving forces. Using one-dimensional hard rods as a model system, we analyze the validity of this key assumption and show that unphysical self-interactions of the(More)
2014 A high resolution electron impact spectrometer using electrostatic monochromators and the cross-beam technique is described. Considerations related to its construction and use in measuring cross-sections are discussed. This instrument has been used to obtain absolute values for differential and integral excitation cross-sections of the n = 2 manifold(More)
This Letter discusses inner-shell excitation in collisions of very heavy ions (2, -2, 2 140) in the framework of the quasimolecular model. The importance of multistep excitations and of coupling between continuum states is demonstrated. The lso vacancy probabilities resulting from coupled-channels calculations exceed perturbation theory by a factor 3-5,(More)
We investigate the microstructural and microrheological response to a tracer particle of a two-dimensional colloidal suspension under thermodynamic conditions close to a liquid-gas phase boundary. On the liquid side of the binodal, increasing the velocity of the (repulsive) tracer leads to the development of a pronounced cavitation bubble, within which the(More)
We discuss the implications of the eikonal amplitude on the pair production probability in ultrarelativistic heavy-ion transits. In this context the WeizsäckerWilliams method is shown to be exact in the ultrarelativistic limit, irrespective of the produced particles’ mass. A new equivalent single-photon distribution is derived which correctly accounts for(More)
We compute the vacuum polarization correction to the binding energy of nuclear matter in the Walecka model using a nonperturbative approach. We first study such a contribution as arising from a ground-state structure with baryon-antibaryon condensates. This yields the same results as obtained through the relativistic Hartree approximation of summing tadpole(More)
The theory of direct electron-positron pair production in the collision of heavy ions i s formulated in the framework of the quasimolecular model. The pair production process acquires a collective nature for (Z1 +Z,)cu; 1 and can be understood a s the shakeoff of the strong vacuum polarization cloud formed in the quasimolecule. The total Cross section is, e(More)
We calculate the spatial correlation of electrons and positrons emitted by internal pair conversion of Coulomb excited nuclei in heavy ion collisions. The alignment or polarization of the nucleus results in an anisotropic emission of the electron-positron pairs which is closely related to the anisotropic emission of γ-rays. However, the angular correlation(More)