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  • 1995-1999  (69)
  • 1975-1979  (8)
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  • 1
    Digitale Medien
    Digitale Medien
    On Electron Dynamics in Violent Cluster Excitations (1999)
    Springer
    Journal of cluster science 10 (1999), S. 239-270 
    Details
    ISSN: 1572-8862
    Schlagwort(e): Electron dynamics ; cluster excitations ; TDLDA
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract This article gives a brief review of recent progress in the theoretical description of electron and ion dynamics following strong excitations of a metal cluster. Intense femtosecond laser pulses and collisions with highly charged ions are considered typical examples for those violent excitation mechanisms. The theoretical tool is time-dependent local-density approximation (TDLDA) complemented by local pseudopotentials and occasionally explicit ionic motion (in terms of classical particles). We discuss the distribution of the initial excitation energy over collective plasmon oscillations, ionization, and internal thermalization. Relevant time scales for the dynamical evolution are evaluated and compared.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1021973512410
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  • 2
    Digitale Medien
    Digitale Medien
    Ground state correlations and the nuclear charge distribution (1979)
    Springer
    The European physical journal 290 (1979), S. 85-91 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Combining a sum rule approach and the generator coordinate model we evaluate the influence of ground state correlations on the moments of the radial charge distribution. The isotopic and isotonic differences of the moments come out to be particularly sensitive to fluctuations of the ground state correlations due to changes in the low energy spectrum. A comparison with the experimental results for the isotopes of Ca, Fe, Ni and Zn shows a fair agreement and confirms the importance of the ground state correlations for isotopic and isotonic differences of radial moments.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01408483
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  • 3
    Digitale Medien
    Digitale Medien
    A model study of Hartree-Fock and Linear Response in coordinate space (1979)
    Springer
    The European physical journal 292 (1979), S. 375-383 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A fast procedure for spherical Hartree-Fock is obtained by coordinate space representation and a modification of gradient iteration. Along similar lines, the corresponding Linear Response equations are derived and solved, in order to achieve a fully consistent treatment. The Linear Response equations are applied to a change in particle numbers, i.e. to the description of isotopic differences. In a model study we look for their physical and numerical properties, i.e. linearity of the response, numerical stability and consistency requirements for the Hartree-Fock basis.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01546436
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  • 4
    Digitale Medien
    Digitale Medien
    A two-center-oscillator-basis as an alternative set for heavy ion processes (1977)
    Springer
    The European physical journal 280 (1977), S. 253-257 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The two-center-oscillator-basis, which is constructed from harmonic oscillator wave functions developing about two different centers, suffers from numerical problems at small center separations due to the overcompleteness of the set. In order to overcome these problems we admix higher oscillator wave functions before the orthogonalization, or antisymmetrization resp. This yields a numerically stable basis set at each center separation. The results obtained for the potential energy surface are comparable with the results of more elaborate models.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01434350
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  • 5
    Digitale Medien
    Digitale Medien
    Theories for multiple resonances (1995)
    Springer
    The European physical journal 351 (1995), S. 391-396 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 21.60.Jz ; 21.60.Ev ; 03.65.Sq
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Two microscope theories for multiple resonances in nuclei are compared, n-particle-hole RPA and quantized Time-Dependent Hartree-Fock (TDHF). The Lipkin-Meshkov-Glick model is used as test case. We find that quantized TDHF is superior in many respects, except for very small systems.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01291144
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  • 6
    Digitale Medien
    Digitale Medien
    Nuclear shell gaps at finite temperatures (1999)
    Springer
    The European physical journal 6 (1999), S. 157-165 
    Details
    ISSN: 1434-601X
    Schlagwort(e): PACS: 21.60.Jz Hartree-Fock and random-phase approximations – 21.60.-n Nuclear-structure models and methods
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: Neutron–rich nuclei with a closed neutron shell represent chains of waiting–point nuclei in the astrophysical r–process. Details of their nuclear structure like separation energies, shell structure and β−–decay half–lives have a dramatic influence on element abundances calculated from r–process simulations. Actual supernova scenarios take place at finite temperature. To investigate the influence of finite temperature on binding energies and shell gaps, i.e. the second derivative of the binding energy, we calculate the shell gaps in the range of interest and slightly beyond, i.e. 0 ≤k B T≤ 0.8 MeV. Basis of the description is the self–consistent Skyrme–Hartree–Fock model and an extension of BCS pairing to finite temperature using a natural orbital representation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s100500050330
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  • 7
    Digitale Medien
    Digitale Medien
    Electron transport in ballistic electron emission microscopy (1998)
    Springer
    Applied physics 66 (1998), S. S897 
    Details
    ISSN: 1432-0630
    Schlagwort(e): PACS: 73.50.-h; 07.79.-v
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s003390051263
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  • 8
    Digitale Medien
    Digitale Medien
    The zero-point energy for rotation (1978)
    Springer
    The European physical journal 285 (1978), S. 93-99 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The Gaussian overlap approach (GOA) becomes inappropriate for describing the rotation of weakly deformed systems. A modification is proposed which allows to maintain the GOA for small deformations. The zero-point energy subtraction, derived from it, provides a simple and reliable approximation for angular momentum projection. It becomes obvious, however, that the projection complicates the equations which determine the motion along the deformation path. These effects are studied in some simple models and the results are condensed into a simple interpolation formula for the total zero-point energy.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01410231
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  • 9
    Digitale Medien
    Digitale Medien
    A comment on time-dependent variational-principles (1977)
    Springer
    The European physical journal 280 (1977), S. 281-282 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Two time-dependent variational principles are compared; the one varies the action integral, the other minimises the deviation from the Schrödinger-equation. They are shown to be equivalent for a variation with complex parameters, but different for a restricted variation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01434355
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  • 10
    Digitale Medien
    Digitale Medien
    Superheavy nuclei in deformed mean--field calculations (1998)
    Springer
    The European physical journal 3 (1998), S. 139-147 
    Details
    ISSN: 1434-601X
    Schlagwort(e): PACS:21.30.Fe Forces in hadronic systems and effective interactions – 21.60.Jz Hartree-Fock and random-phase approximations – 24.10.Jv Relativistic models – 27.90.+b 220 ≤ A
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: The ground–state properties of superheavy nuclei are investigated within various parametrisations of relativistic and nonrelativistic nuclear mean–field models. The heaviest known even–even nuclei starting with Z = 98 are used as a benchmark to estimate the predictive power of the models and forces. From that starting point, deformed doubly magic nuclei are searched in the region 100 ≤ Z ≤ 130 and 142 ≤ N ≤ 190.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s100500050160
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