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  • 1980-1984  (2)
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  • 1
    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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    Paper (German National Licenses)
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  • 2
    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
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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