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  • 1
    Electronic Resource
    Electronic Resource
    Relativistic bound states in QCD (1991)
    Springer
    Few body systems 10 (1991), S. 87-104 
    Details
    ISSN: 1432-5411
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper deals with the construction of a nonlocal theory of hadrons as bound states of quarks and gluons. The starting point of the investigation is a relativistic covariant definition of instantaneous bound states and the supposition of the dominance of an instantaneous gluon interaction. We have generalized the unified description of the nonlocal relativistic heavy and light mesons to the case of many-quark and many-gluon configurations using an operator approach. This includes the rules for the construction of relativistic wave functions in an arbitrary frame.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01083044
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  • 2
    Electronic Resource
    Electronic Resource
    Expanding fireballs and the account of the Pauli quenching for the deuteron production (1982)
    Springer
    The European physical journal 308 (1982), S. 187-188 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Describing the expanding fireballs in a relativistic gas dynamical approach the formation of deuterons is calculated under consideration of inmedium corrections. The theoretical results are in good agreement with experimental data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01413012
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  • 3
    Electronic Resource
    Electronic Resource
    One-body dynamics modified by collective fluctuations (1988)
    Springer
    The European physical journal 331 (1988), S. 43-51 
    Details
    ISSN: 1434-601X
    Keywords: 24.10.Cn ; 24.60 ; 25.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We show how the fluctuating part of the residual coupling between collective and intrinsic motion of a dissipative heavy-ion collision induces correlations in either subspace. They lead in general to a transport equation for the collective motion, and to a new term in the equation for the one-body density which describes collisions with the collective fluctuations. The resulting redistribution of the single-particle occupation numbers ρα and the evolution of the fluctuations are coupled with each other due to the dependence of the transition rates in the master equation on the fluctuations, and of the transport coefficients on ρα. Considering the special case of a long contact phase, we find the fluctuations to be most effective, with respect to a randomization of ρα, within a certain critical region where they pass from stable to unstable behaviour. Estimates are made for the corresponding relaxation times employing a schematic model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01289429
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  • 4
    Electronic Resource
    Electronic Resource
    The doorway concept in dissipative heavy-ion collisions (1980)
    Springer
    The European physical journal 296 (1980), S. 55-63 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In order to describe dissipative heavy ion collisions microscopically a generalized master equation for the reduced density operator of the relative motion is derived. In the approach phase the description of the time development of the internal system is considerably simplified by employing a doorway concept. Concerning the coupling between doorway and more complex states a strong and weak coupling limit is defined. The resulting classical equation for the relative motion shows up to be reversible at the beginning of the collision process and becomes irreversible later on. The corresponding friction coefficient tourns out to be proportional to the width of the doorway states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01415615
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  • 5
    Electronic Resource
    Electronic Resource
    Nucleus-nucleus collisions: Intrinsic motion with external correlations (1983)
    Springer
    The European physical journal 314 (1983), S. 97-106 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A consistent treatment of the relative and intrinsic motion which goes beyond the mean-field approach allows to include the fluctuations of the time-dependent mean field for the intrinsic as well as for the relative motion. Starting with the v. Neumann equation for the total density matrix, we derive a modified equation for the intrinsic many-body density matrix. This equation is used to obtain the quantum kinetic equations for the one-body density matrix and the two-body correlator. In the time-dependent single-particle basis, the occupation numbers change in time due to a collision term originating from residual two-body interactions which account for equilibration, and due to the fluctuations of the external mean field. The relations to TDHF with collision term are discussed. Special attention is paid to the conditions for a diabatic evolution of the single-particle states and to finite size effects which play an important role to make two-body collisions operative in finite nuclei.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01411836
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  • 6
    Electronic Resource
    Electronic Resource
    Critical scattering in heavy ion reactions (1992)
    Springer
    The European physical journal 343 (1992), S. 43-46 
    Details
    ISSN: 1434-601X
    Keywords: 24.10.Cu ; 25.70.−z
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Heavy ion reactions at intermediate energies are mostly described by the VUU equations. Using methods of quantum statistics we derive a useful relation between the width of s.p. states and the density — density correlation function. Near the point of instability from this relation there follows the increase of the collision integral and enhanced equilibration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01291596
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  • 7
    Electronic Resource
    Electronic Resource
    Precritical increase of particle collision rates (1991)
    Springer
    The European physical journal 339 (1991), S. 239-242 
    Details
    ISSN: 1434-601X
    Keywords: 24.10.Cu ; 25.70.−z
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In quantum kinetics the collision integral follows from the imaginary part of the mass operator. Using this connection we demonstrate that the coupling of single particle motion to precritical density fluctuations causes a strong increase of the collision integral near the point of instability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01284058
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    Paper (German National Licenses)
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