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  • 1990-1994  (6)
  • 1985-1989  (7)
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  • 1
    Digitale Medien
    Digitale Medien
    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
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.467889
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  • 2
    Digitale Medien
    Digitale Medien
    The relativistic mean-field model at large densities (1988)
    Springer
    The European physical journal 331 (1988), S. 367-368 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 21.10.Dr ; 21.60.Jz ; 21.65.+f
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01355612
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  • 3
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): 25.30.Fj ; 21.60.−n
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01292580
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  • 4
    Digitale Medien
    Digitale Medien
    RPA in nuclei and metal clusters (1994)
    Springer
    The European physical journal 349 (1994), S. 219-222 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 21.60.Jz ; 36.40.+d
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01288962
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  • 5
    Digitale Medien
    Digitale Medien
    Truncation of time-dependent many-body theories (1990)
    Springer
    The European physical journal 336 (1990), S. 123-131 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 05.45.+b ; 03.65.Ca ; 03.65.Sq
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01290612
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  • 6
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): 21.10
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01290231
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  • 7
    Digitale Medien
    Digitale Medien
    Generalized nonlinear couplings in the relativistic mean-field model (1992)
    Springer
    The European physical journal 342 (1992), S. 379-386 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 21.30.+y ; 21.60.Jz ; 21.65.+f
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01294947
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  • 8
    Digitale Medien
    Digitale Medien
    A sum-rule approach to nuclear ground state correlations (1985)
    Springer
    The European physical journal 321 (1985), S. 619-632 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 21.60.Jz
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01432439
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  • 9
    Digitale Medien
    Digitale Medien
    The shell structure of3He droplets (1992)
    Springer
    The European physical journal 23 (1992), S. 275-282 
    Details
    ISSN: 1434-6079
    Schlagwort(e): 67.50.Dg ; 36.40. + d ; 65.90. + i
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Liquid3He droplets and their shell structure are investigated in the framework of mean-field calculations using a recently developed effective energy functional which employs realistic finite range interactions throughout. The samples range fromN=20 up toN=1360. The shell closures found agree with the harmonic oscillator scheme up toN=168. Above that, magic droplets appear atN=198, 274, 300, 368, 398, 482, 516... The first and second differences of the free energy are computed as signals for the shell structure in future experiments. Shell closures are found to be still visible in these signals at comparatively high temperatures. The finite range character of the effective interaction generates oscillations in the density profile which are suppressed in comparable calculations with zero range interactions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01437405
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  • 10
    Digitale Medien
    Digitale Medien
    The structure-averaged jellium model for metal clusters (1994)
    Springer
    The European physical journal 32 (1994), S. 125-136 
    Details
    ISSN: 1434-6079
    Schlagwort(e): 31.20.Sy ; 31.20.Rx ; 36.40.+d
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We present an extension of the jellium model for alkali clusters which allows a selfconsistent determination of the jellium background in addition to the Kohn-Sham solution of the electron dynamics. It includes the volume and the surface energy of the ionic distribution. We discuss applications to the shape of clusters and to the position and width of the plasmon resonances.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01425932
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