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  • 03.65.Ca  (1)
  • 21.10.−k  (1)
  • 21.60.−n  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Truncation of time-dependent many-body theories (1990)
    Springer
    The European physical journal 336 (1990), S. 123-131 
    Details
    ISSN: 1434-601X
    Keywords: 05.45.+b ; 03.65.Ca ; 03.65.Sq
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We investigate truncation schemes for the many-body dynamics of finite fermion systems beyond the time-dependent Hartree-Fock (TDHF) approximation. One approach starts from the quantum Bogolyubov-Born-Green-Kirkwood-Yvon (BBGKY-)hierarchy of equations of motion for density matrices. It is shown that simple truncation of higher correlations within this scheme is inconsistent because essential exchange correlations are lost. As an alternative, we study the (extended) exp(S) or coupled-cluster formalism. It provides a wider range of applicability. But it also runs into problems with non-unitary propagation after truncation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01290612
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Quasi-free electron scattering in a relativistic model of the nucleus (1989)
    Springer
    The European physical journal 332 (1989), S. 51-59 
    Details
    ISSN: 1434-601X
    Keywords: 25.30.Fj ; 21.60.−n
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Longitudinal and transverse response functions of quasi-free electron scattering have been calculated in mean field approximation for a relativisticσ-ω model, including non-linearities in theσ-field. As a consequence of the completely consistent and fully relativistic treatment of wave functions and current operators, gauge invariance is perfectly satisfied throughout the calculation. The results indicate that models with the same nuclear bulk properties lead to similar response functions within 10%. Our results agree with the experimental data for12C and238U, but cannot describe the longitudinal response in the Ca-Fe region. Predictions for208Pb are given for comparison with future experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01292580
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Mean field model for relativistic heavy ion collisions (1987)
    Springer
    The European physical journal 326 (1987), S. 269-277 
    Details
    ISSN: 1434-601X
    Keywords: 21.60.Jz ; 21.30. + y ; 21.10.−k
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We take up a relativistic mean-field model consisting out of nucleons coupled to a scalar and a vector meson. We solve the corresponding time-dependent mean-field equations on a three-dimensional grid. Results for16O +16O scattering at various energies and various impact parameters show significant differences with conventional TDHF calculations. We see sidewards collective flow similar as in fluid dynamics and in experiment. We observe complete spallation and remarked oscillations of the meson fields.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01297581
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    Paper (German National Licenses)
    Fulltext
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