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  • 1
    Electronic Resource
    Electronic Resource
    η′ Production in proton-proton collisions near threshold (1998)
    Springer
    The European physical journal 2 (1998), S. 333-335 
    Details
    ISSN: 1434-601X
    Keywords: PACS:13.75.C Nucleon-nucleon interactions – 12.40.V One-meson exchange model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstact: Within the one-pion exchange model we calculate the near-threshold η′ production from pp collisions including the final state interaction between the protons. Since the description of the data is quite well we conclude that η, ρ or ω exchange currents either play no role or cancel each other to a large extent in this reaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500050129
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  • 2
    Electronic Resource
    Electronic Resource
    On the quantum mechanical description of scattering by a dissipative and diffusive scattering centre (1979)
    Springer
    The European physical journal 291 (1979), S. 339-346 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A partial integro-differential equation is formulated for the Wigner transform of the quantum mechanical reduced density operator describing the time evolution of a “macroscopic” coordinate under the influence of coupling to a large number of “intrinsic” degrees of freedom. The equation contains integral operators which lead to energy dissipation and diffusion and reduces to a transport equation of the Fokker-Planck type if the form factors in the integrands are treated in appropriate (harmonic) approximations. The stationary solution of the partial integro-differential equation is obtained numerically for scattering by a conservative potential and by a dissipative and diffusive scattering centre in one spatial dimension.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01408384
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  • 3
    Electronic Resource
    Electronic Resource
    Correlation dynamics of Yukawa-theory in 1+1 dimensions (1998)
    Springer
    The European physical journal 2 (1998), S. 355-370 
    Details
    ISSN: 1434-601X
    Keywords: PACS:11.10-z Field theory – 11.10.Ef Lagrangian and Hamiltonian approach – 11.15.Tk Other nonperturbativ techniques
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstact: Using the method of correlation dynamics we investigate the properties of a field-theory for fermions and scalar bosons coupled via a Yukawa interaction. Within this approach, which consists in an expansion of full equal-time Green functions into connected equal-time Green functions and a corresponding truncation of the hierarchy of equations of motion we carry out calculations up to 4th order in the connected Green functions and evaluate the effective potential of the theory in 1+1 dimensions on a torus. Comparing the different approximations we find a strong influence of the connected 4-point functions on the properties of the system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500050132
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  • 4
    Electronic Resource
    Electronic Resource
    ωN final state interactions and ω-meson production from heavy-ion collisions (1999)
    Springer
    The European physical journal 6 (1999), S. 71-81 
    Details
    ISSN: 1434-601X
    Keywords: PACS: 25.75.-q Relativistic heavy-ion collisions – 25.80.-e Meson- and hyperon-induced reactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We calculate the elastic and inelastic ωN→ωN, →πN, →ρN, →ρπN, →ππN, →σN reactions within a boson exchange approximation where the ωρπ coupling constant and form factor are fixed by the reaction πN→ωN in comparison to the experimental data. We find rather large ωN cross sections at low relative momenta of the ω-meson which leads to a substantial broadening of the ω-meson width in nuclear matter. The implications of the ωN final state interactions are studied for ω production in 12C +12C, 40Ca +40Ca and 58Ni +58Ni reactions at about 2 · A GeV within the HSD transport approach; the drastic changes of the transverse mass spectra relative to a general m T-scaling (for π0 and η mesons) might be controlled experimentally by the TAPS Collaboration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500050319
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  • 5
    Electronic Resource
    Electronic Resource
    Dynamical and thermal aspects of relativistic heavy-ion collisions (1991)
    Springer
    The European physical journal 340 (1991), S. 287-295 
    Details
    ISSN: 1434-601X
    Keywords: 25.70.−z ; 25.70.Np
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Within a covariant BUU-approach we simulate heavyion collisions at various bombarding energies from 400 MeV/u to 1 GeV/u. We evaluate locally the energymomentum tensorT μv (x), and extract pressures, energydensities and temperatures. The connection of these thermodynamical quantities to experimental observables and their sensitivity to the equation of state is discussed. Furthermore, we investigate the question of local equilibration and evaluate the entropy produced in these reactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294677
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  • 6
    Electronic Resource
    Electronic Resource
    η Production in proton-nucleus reactions (1991)
    Springer
    The European physical journal 340 (1991), S. 51-57 
    Details
    ISSN: 1434-601X
    Keywords: 25.40.−h
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The production ofη-mesons in proton-nucleus reactions is analysed with respect to primary nucleon-nucleon (NN→NNη) and secondary pion-nucleon (πN→ηN) production processes on the basis of Hartree-Fock groundstate momentum distributions and free on-shell production processes. The folding model adopted compares well for meson production with more involved simulations based on VUU transport equations. Similar to K+ production in proton-nucleus reactions theη-mesons are primarily produced by theπN →ηN channel. However,η-mesons are absorbed in nuclei via excitation of the N* (1535) resonance which leads to strong distortions of the primordial spectra. On the other hand, the experimental mass dependence of the differential cross sections might yield information about the in-medium properties of this resonance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01284480
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  • 7
    Electronic Resource
    Electronic Resource
    Antiproton production inp+A andd+A reactions at subthreshold energies (1994)
    Springer
    The European physical journal 348 (1994), S. 247-248 
    Details
    ISSN: 1434-601X
    Keywords: 25.40.-h
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The production of antiprotons in proton-nucleus and deuteron-nucleus collisions is analyzed with respect to one-step nucleon-nucleon (NN → NNp¯ p) and secondary Δ-nucleon (ΔN → NNN¯ p) production channels within a phase-space model incorporating the selfenergies of the baryons. It is found that contrary to nucleus-nucleus collisions the Δ induced reaction channels are of minor importance except at very low bombarding energies. The data from KEK are approximately reproduced when accounting for the internal momentum distribution of the deuteron which provides a natural explanation for the large enhancement of the ¯p cross section ind+A as compared top+A.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01305878
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  • 8
    Electronic Resource
    Electronic Resource
    K + production in proton and deuteron induced reactions at subthreshold energies (1994)
    Springer
    The European physical journal 349 (1994), S. 77-86 
    Details
    ISSN: 1434-601X
    Keywords: 25.40.−h
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The production ofK + mesons in proton-nucleus and deuteron-nucleus collisions is analyzed with respect to one-step nucleon-nucleon (NN → N ΛK +),Δ- nucleon (ΔN → N Λ K+) and two-step pion-nucleon (πN → K + Λ) production channels on the basis of experimental ground state momentum distributions and free on-shell production processes. Whereas forK + production in proton-nucleus reactions the secondary channelπN clearly dominates at subthreshold energies, meson and nucleon induced channels are of similar magnitude in deuteron-nucleus reactions. Contrary to nucleus-nucleus collisions theΔ induced reaction channels are found to be of minor importance. The experimental differentiation of the underlying microscopic reaction channels appears possible via differential proton —K + coincidence measurements as shown in detail by the microscopic simulations including proton rescattering.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01296336
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  • 9
    Electronic Resource
    Electronic Resource
    Self-consistent truncation of the BBGKY hierarchy on the two-body level (1992)
    Springer
    The European physical journal 342 (1992), S. 161-167 
    Details
    ISSN: 1434-601X
    Keywords: 24.10.Cn ; 25.70.−z
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present a coupled set of equations for the one-body density matrix and the two-body correlation function consistent with trace relations and conservation laws which provide an extension of correlation dynamics on the two-body level. The additional interaction terms are discussed in the context of time-dependent G-matrix theory and NQCD and studied numerically by one-dimensional calculations for colliding finite fermion systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01288464
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  • 10
    Electronic Resource
    Electronic Resource
    Photon production in nucleon-nucleon collisions (1991)
    Springer
    The European physical journal 339 (1991), S. 391-398 
    Details
    ISSN: 1434-601X
    Keywords: 14.80.Am ; 25.20.Gf ; 25.20.Lj
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We calculate the differential cross section for nucleonnucleon bremsstrahlung in covariant way based on a realistic meson-exchange approximation for the NN-scattering amplitude. The results are discussed in comparison to semiclassical approximations and with respect to the role of internal radiation diagrams. The influence of the anomalous magnetic moment on the proton-neutron bremsstrahlung is found to contribute up to 50% for specific kinematical conditions. Recent measurements on the elementary differential cross sectionpn→pnγ are found to be quite accurately reproduced. Furthermore, for use in proton-nucleus and nucleus-nucleus collisions, we present a parametrization of thepnγ cross section within a broad kinematical range.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01560642
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