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  • 1
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    Crossed Beam Pump and Probe Dynamics in Metal Clusters (2004)
    Details
    Publication Date: 2020-03-23
    Language: English
    Type: article , doc-type:article
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    OPUS
  • 2
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    Collectivity in the optical response. of small metal clusters (2001)
    Details
    Publication Date: 2020-03-23
    Language: English
    Type: article , doc-type:article
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    OPUS
  • 3
    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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  • 4
    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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    Paper (German National Licenses)
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  • 5
    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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  • 6
    Electronic Resource
    Electronic Resource
    RPA in nuclei and metal clusters (1994)
    Springer
    The European physical journal 349 (1994), S. 219-222 
    Details
    ISSN: 1434-601X
    Keywords: 21.60.Jz ; 36.40.+d
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We discuss and compare the gross features of resonance excitations in nuclei and metal clusters. We point out the phenomenon of ”jellium scaling” which means that different materials for metal clusters all give similar resonance spectra and we discuss the various effects which determine the exact position of the resonance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01288962
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Consequences of the center–of–mass correction in nuclear mean–field models (2000)
    Springer
    The European physical journal 7 (2000), S. 467-478 
    Details
    ISSN: 1434-601X
    Keywords: PACS:21.60.Jz Hartree-Fock and random-phase approximations – 21.30.Fe Forces in hadronic systems and effective interactions – 21.65.+f Nuclear matter – 24.10.Jv Relativistic models
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We study the influence of the scheme for the correction for spurious center–of–mass motion on the fit of effective interactions for self–consistent nuclear mean–field calculations. We find that interactions with very simple center–of–mass correction have significantly larger surface coefficients than interactions for which the center–of–mass correction was calculated for the actual many–body state during the fit. The reason for that is that the effective interaction has to counteract the wrong trends with nucleon number of all simplified schemes for center–of–mass correction which puts a wrong trend with mass number into the effective interaction itself. The effect becomes clearly visible when looking at the deformation energy of largely deformed systems, e.g. superdeformed states or fission barriers of heavy nuclei.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00013645
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    Paper (German National Licenses)
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  • 8
    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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  • 9
    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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    Paper (German National Licenses)
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  • 10
    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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    Paper (German National Licenses)
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