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  • 1990-1994  (6)
  • 1985-1989  (7)
  • 1
    Electronic Resource
    Electronic Resource
    Semiclassical molecular dynamics for strongly coupled Coulomb systems (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 10766-10774 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Based on the time-dependent variational principle for a Hartree wave function, a semiclassical approximation for a strongly correlated plasma is derived. This procedure maps the quantum dynamical problem to a classical one with one additional degree of freedom per particle and is considered the natural extension of classical molecular dynamics. As a test case, a single electron in a Coulomb potential is studied. For the full many-body problem the pair distribution function, the velocity autocorrelation function, the conductivity, and the diffusion constants are calculated for a plasma. We also consider liquid molecular hydrogen and lithium as a further test case which is sensitive to the treatment of the Pauli exclusion principle. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467889
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Density as a constraint and the separation of internal excitation energy in TDHF (1985)
    Springer
    The European physical journal 320 (1985), S. 475-482 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present a fast and efficient constrained Hartree-Fock iteration scheme which constraints the complete density distribution to remain constant. The scheme is particularly suited to a coordinate- or momentum-space representation. The technique is applied to separate the collective and the internal energy in a propagating TDHF state. We study the behavior of these two energies in an16O+16O collision.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01415725
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A sum-rule approach to nuclear ground state correlations (1985)
    Springer
    The European physical journal 321 (1985), S. 619-632 
    Details
    ISSN: 1434-601X
    Keywords: 21.60.Jz
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract By combining the sum-rule approximation to nuclear giant resonances with a generator-coordinate description of the collective ground-state we obtain a simple estimate of the collective ground-state correlations. We investigate the approach for a variety of nuclei and forces. The correlation effects are small but not negligible in view of the precision achieved in modern Skyrme-Hartree-Fock calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01432439
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Generalized nonlinear couplings in the relativistic mean-field model (1992)
    Springer
    The European physical journal 342 (1992), S. 379-386 
    Details
    ISSN: 1434-601X
    Keywords: 21.30.+y ; 21.60.Jz ; 21.65.+f
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Most general forms of the nonlinear selfcoupling of the scalar field in the relativistic mean-field model are discussed, the frequently used form where the scalar mass is field-dependent, and an alternative where the scalar coupling constant becomes field-dependent. Both models are shown to be fully equivalent in homogenous systems. They are practically equivalent in finite nuclei. Parametrizations in the nonlinear scalar coupling model which are constructed to avoid the nucleon-antinucleon instability at large densities fail to give a good description of common ground-state properties of finite nculei.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294947
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  • 5
    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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  • 6
    Electronic Resource
    Electronic Resource
    The relativistic mean-field model at large densities (1988)
    Springer
    The European physical journal 331 (1988), S. 367-368 
    Details
    ISSN: 1434-601X
    Keywords: 21.10.Dr ; 21.60.Jz ; 21.65.+f
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The extrapolation properties of the relativistic mean-field model are investigated in nuclear matter. The results of a recent relativistic Bethe-Brueckner-Gatdstone calculation are taken as ‘data”. Fits in a window of normal nuclear densities are extrapolated to large densities and compared with the ‘data’. We find large discrepancies which hint at an insufficiency of the model in its present parametrisation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01355612
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  • 7
    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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  • 8
    Electronic Resource
    Electronic Resource
    The nonlinearity of the scalar field in a relativistic mean-field theory of the nucleus (1988)
    Springer
    The European physical journal 329 (1988), S. 257-266 
    Details
    ISSN: 1434-601X
    Keywords: 21.10
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The form of the nonlinear self-coupling of the scalar meson field in a nuclear relativistic mean-field theory is investigated. The conventional ansatz is shown to produce instabilities in critical applications. A modified self-coupling is proposed which guarantees stability under all conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01290231
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  • 9
    Electronic Resource
    Electronic Resource
    Nuclear ground-state properties in a relativistic Meson-Field theory (1986)
    Springer
    The European physical journal 323 (1986), S. 13-25 
    Details
    ISSN: 1434-601X
    Keywords: 21.10
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We investigate the ability of a relativistic Mean-Field theory to reproduce nuclear ground state properties by an exhaustive fit to experimental data. We find that the bulk properties of nuclei from16O to208Pb can be adjusted very well. There remain problems with level density and fluctuations in the charge density similar as in fits using the conventional Skyrme Hartree-Fock model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294551
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    Paper (German National Licenses)
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  • 10
    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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