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  • 1
    Digitale Medien
    Digitale Medien
    Erratum: "Effect of a magnetic flux line on the quantum beats in the Hénon–Heiles level density'' [Chaos 5, 317 (1995)] (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Chaos 5 (1995), S. 707-708 
    Details
    ISSN: 1089-7682
    Quelle: AIP Digital Archive
    Thema: Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.166146
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  • 2
    Digitale Medien
    Digitale Medien
    Effect of a magnetic flux line on the quantum beats in the Hénon–Heiles level density (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Chaos 5 (1995), S. 317-329 
    Details
    ISSN: 1089-7682
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The quantum density of states of the Hénon–Heiles potential displays a pronounced beating pattern. This has been explained by the interference of three isolated classical periodic orbits with nearby actions and periods. A singular magnetic flux line, passing through the origin, drastically alters the beats even though the classical Lagrangian equations of motion remain unchanged. Some of the changes can be easily understood in terms of the Aharonov–Bohm effect. However, we find that the standard periodic orbit theory does not reproduce the diffraction-like quantum effects on those classical orbits which intersect the singular flux line, and argue that corrections of relative order (h-dash-bar) are necessary to describe these effects. We also discuss the changes in the distribution of nearest-neighbor spacings in the eigenvalue spectrum, brought about by the flux line. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.166080
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  • 3
    Digitale Medien
    Digitale Medien
    Microsatellite polymorphisms reveal phylogenetic relationships in primates (1995)
    Springer
    Journal of molecular evolution 41 (1995), S. 10-14 
    Details
    ISSN: 1432-1432
    Schlagwort(e): Microsatellite ; DNA polymorphism ; Primate phylogeny ; DNA sequencing
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract We amplified, via PCR, DNA segments from intron 1 of the tyrosine hydroxylase gene (TH01) and intron 40 of the von Willebrand factor gene (VWA) in ten nonhuman primate genera. In humans both introns contain polymorphic microsatellites with tetrameric repeats. Compared to the allelic ranges in human populations relatively short repeat arrays could be detected for the nonhuman primates typed, presumably reflecting an ancient precursor state at both microsatellite loci. Furthermore, our results provide evidence for an association of the average number of repeats present in different primate genera and their divergence time from man. DNA sequencing of VWA orthologues revealed a relatively high variability in the arrangement of repeats in the 5′-repeat arrays, the generation of which could probably be explained by polar mutational events.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00174036
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  • 4
    Digitale Medien
    Digitale Medien
    Spin-orbit splitting in theN-Δ spectra and the deformed baryon model (1985)
    Springer
    The European physical journal 29 (1985), S. 385-396 
    Details
    ISSN: 1434-6052
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The absence of appreciable spin-orbit splitting in the low-lying even and odd parity states of the nucleon and delta is puzzling in conventional quark models. A constitutent quark model, in which the quarks interact through gluon as well as pion exchange, and the baryon is allowed to deform in the excited states, may provide a solution to the problem.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01565186
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  • 5
    Digitale Medien
    Digitale Medien
    Particle-liquid dynamics of nuclear deformations. 1 (1984)
    Springer
    The European physical journal 316 (1984), S. 217-223 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Equations of a combined, liquid plus particle model are derived which accounts consistently for the short-range liquid properties of nuclei as well as for the long-range quasi-particle behavior. Macroscopic quantities are defined as statistical averages and their dynamics is determined by an Euler-type equation, which contains a term due to the interaction with the gas component, and also by the continuity equation. For the quasi-particle component the full quantal treatment is kept in the form of the Liouville equation with a time-dependent external potential related to the bulk density. It may include the residual quasi-particle interaction. It is suggested that the solution of the coupled dynamics is facilitated by the explicit use of an effective sharp nuclear surface as a dynamical variable.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01412266
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  • 6
    Digitale Medien
    Digitale Medien
    Semiclassical calculations with nuclear model potentials in the ħ-resummation approach (1984)
    Springer
    The European physical journal 315 (1984), S. 341-347 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The single-particle densityρ(r) of a system of fermions can be calculated in a tractable way as the Laplace inverse of the Bloch density describing the system. The complex integrals involved can be solved very easily by the saddle-point method. The semiclassical nature of this approach is illustrated in the simple example of the single-particle level density of a harmonic oscillator potential. It is then applied to calculate the total energy of particles in different mean field potentials. The exact Bloch density being generally unknown, different approximate forms are used in our calculations which correspond to a partial resummation of the Wigner-Kirkwoodħ-expansion. The resulting local densities reproduce the exact density distributions on the average, without quantal oscillations. They are well defined everywhere, even beyond the classical turning point, in contrast to the original Wigner-Kirkwood approach.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01438459
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  • 7
    Digitale Medien
    Digitale Medien
    Shells and periodic orbits in fermion systems (1998)
    Springer
    Czechoslovak journal of physics 48 (1998), S. 845-852 
    Details
    ISSN: 1572-9486
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We provide a semiclassical description of the shell structure in large prolate cavities. Level densities and shell-correction energies are obtained from periodic orbit theory, using a version of Gutzwiller's trace formula that takes into account continuous symmetries. The semiclassical results are compared with their quantum-mechanical counterparts.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1021455520508
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  • 8
    Digitale Medien
    Digitale Medien
    Partial resummation ofℏ-expansion of the Bloch density for non local potentials (1980)
    Springer
    The European physical journal 296 (1980), S. 87-90 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The Wigner-Kirkwoodℏ-expansion of the Wigner transform of the Bloch density can be resummed in the case of non local potentials if we keep only up to second order derivatives of the Wigner transform of the non-local potential with respect to the phase space variables. We also investigate a second approximation to the Bloch density where care has been taken with respect to a consistentℏ expansion. For a one dimensional example we calculate the smooth part of the density and the corresponding energy demonstrating that both approximations to the Bloch-density yield well defined average densitiesand energies.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01415620
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  • 9
    Digitale Medien
    Digitale Medien
    Validity of the semiclassical kinetic energy density functional for deformed nuclear shapes (1980)
    Springer
    The European physical journal 297 (1980), S. 247-256 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We investigate the semiclassical kinetic energy density functionalτ[ρ] for deformed nuclear shapes. Using Strutinsky-averaged quantities as reference, we demonstrate that the functionalτ[ρ] is able to reproduce the averaged kinetic energies very accurately, even at very large deformations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01892805
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  • 10
    Digitale Medien
    Digitale Medien
    Structure and optic response of the Na9 + and Na55 + clusters (1999)
    Springer
    The European physical journal 9 (1999), S. 149-152 
    Details
    ISSN: 1434-6079
    Schlagwort(e): PACS: 36.40.-c Atomic and molecular clusters – 31.15.-p Calculations and mathematical techniques in atomic and molecular physics – 71.15.-m Methods of electronic structure calculations
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract. We present the ionic geometries of Na9 + and Na55 + clusters obtained in the “cylindrically averaged pseudopotential scheme”. Our structures are tested by calculating photoabsorption spectra and comparing them to the experimentally measured ones. We employ a local pseudopotential that has been constructed to reproduce atomic and bulk properties of sodium. Comparing the results using different pseudopotentials, we find that the position of the dipole resonance is greatly influenced by details of the pseudopotentials, showing that these must be used consistently both in the geometry optimization and the calculation of the optic response.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s100530050416
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