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  • 1
    Electronic Resource
    Electronic Resource
    Angular momentum and temperature dependence of fission barriers with a realistic force (1990)
    Springer
    The European physical journal 336 (1990), S. 31-36 
    Details
    ISSN: 1434-601X
    Keywords: 21.60.−n ; 25.70.Gh ; 25.85.−w
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Within a realistic effective nucleon-nucleon interaction, derived from the Reid soft-core potential at zero temperature by solving the Bethe-Goldstone equation and by renormalizing for the finite model space, the dependence on temperature and angular momentum of fission barriers is investigated for the nuclei132Ce and152Dy. The nuclear densities at given values of temperature, angular momentum and quadrupole moment are selfconsistently generated using a Thomas-Fermi model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01904159
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Nucleon pair structure of realistic many body wave functions (1993)
    Springer
    The European physical journal 347 (1993), S. 87-92 
    Details
    ISSN: 1434-601X
    Keywords: 21.60.Cs ; 21.60.Jz
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The scalar part of the two-body density is calculated for the20Ne ground band and for the yrast 2+ state in68Ge as obtained by solving the Hartree-Fock-Bogoliubov problem with symmetry-projection before the variation. The nucleon pair structure of these states is analysed and the results obtained with different effective Hamiltonians are compared.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01284674
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  • 3
    Electronic Resource
    Electronic Resource
    Structure of negative-parity states in68Ge (1993)
    Springer
    The European physical journal 347 (1993), S. 15-20 
    Details
    ISSN: 1434-601X
    Keywords: 21.10 ; 27.50
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A microscopic description of negative parity states in the nucleus68Ge is presented. The investigation is based on the EXCITED VAMPIR model in which via a chain of variational calculations first an optimal configuration space ofi symmetry-projected Hartree-Fock-Bogoliubov determinants for thei lowest states of a given symmetry is constructed and subsequently the residual interaction is diagonalised. Though some considerable quantitative discrepancies are obtained, qualitatively the theoretical results agree rather nicely with the complex pattern of negative parity states in this nucleus which has been recently found experimentally. Underlying structures and electromagnetic properties are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01301271
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  • 4
    Electronic Resource
    Electronic Resource
    Relativistic effects in heavy-ion collisions at SIS energies (1995)
    Springer
    The European physical journal 351 (1995), S. 59-69 
    Details
    ISSN: 1434-601X
    Keywords: 25.75.+r
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The covariant and non-covariant Quantum Molecular Dynamics models are applied to investigate possible relativistic effects in heavy ion collisions at SIS energies. These relativistic effects which arise due to the full covariant treatment of the dynamics are studied at bombarding energiesE lab=50, 250, 500, 750, 1000, 1250, 1500, 1750 and 2000 MeV/nucl. A wide range of the impact parameter fromb=0 fm tob=10 fm is also considsered. In the present study, five systems12C-12C,16O-16O,20Ne-20Ne,28Si-28Si and40Ca-40Ca are investigated. The full covariant treatment at low energies shows quite good agreement with the corresponding non-covariant whereas at higher energies it shows less stopping and hence less thermal equilibrium as compared to the non-covariant approach. The collisions dynamics is less affected. The density using RQMD rises and drops faster than with QMD. The relativistic effects show some influence on the resonance matter production. Overall, the relativistic effects at SIS energies (≦2000 MeV/nucl.) are less significant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01292786
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  • 5
    Electronic Resource
    Electronic Resource
    Ist unsere Welt einfach? (1991)
    Springer
    Naturwissenschaften 78 (1991), S. 145-153 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01136200
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  • 6
    Electronic Resource
    Electronic Resource
    Eine Neufassung der Theorie des Sternheimer-Effektes (1962)
    Springer
    The European physical journal 167 (1962), S. 229-242 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Zusammenfassung Es wird eine Theorie für die Abschirmung des Kernquadrupolfeldes durch den Atomrumpf entwickelt (Sternheimer-Effekt). Die im Atomrumpf durch das Kernquadrupolmoment induzierte Ladungsverschiebung korrigiert das mit Hilfe der HFS-Aufspaltung gemessene Kernquadrupolmoment. In der vorliegenden Arbeit werden die Korrekturen für die Elemente B10, Cl35, Ga69 und Ga71 berechnet. Im Gegensatz zu der zuerst von R.Sternheimer durchgeführten Behandlung des Problems, besteht die hier entwickelte Theorie in einer systematischen Näherungs-methode, wobei — anders als beiSternheimer, wo nur Winkelverschiebungen der Rumpfelektronen auftreten — auch Radialverschiebungen berücksichtigt werden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01378834
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  • 7
    Electronic Resource
    Electronic Resource
    Polarization of α-clusters in light nuclei? (1972)
    Springer
    The European physical journal 255 (1972), S. 112-118 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The α-particle model of Brink is extended to allow for non-spherical clusters. This is done by admixingp-functions to thes-single particle states which represent, in the usual version of the model, the nucleons in a cluster. The results in the nuclei8Be,12C,16O, and20Ne indicate that the spherical clusters represent the stable configurations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01394521
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  • 8
    Electronic Resource
    Electronic Resource
    Asymmetric fission in the shell-correction method with the asymmetric two-center shell model (1974)
    Springer
    The European physical journal 271 (1974), S. 161-167 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The asymmetry of the fragment mass distribution of fissioning nuclei is described by suitable parametrization of an asymmetric two-center shell model (ATCSM). The deformation energy surface is calculated by applying a modified shell-correction prescription due to Strutinsky. It is shown that the ATCSM is specially suited for the description of the scission asymmetry which turns out to be strongly dependent on the shell structure of the fragments. It is demonstrated that the mass asymmetry at scission is unaffected by whether or not the Strutinsky renormalization for the shell corrections is employed for the calculation of the deformation energy surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01676386
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  • 9
    Electronic Resource
    Electronic Resource
    Experimental studies of the level scheme of143Eu and a generalized decoupling model description (1976)
    Springer
    The European physical journal 277 (1976), S. 129-139 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Excited levels of143Eu have been investigated by nuclear spectroscopy methods. We measured γ-rays and conversion electron singles spectra as well asγγ-coincidences from mass separated143mGd sources (108 s) prepared after the irradiation of144Sm with 78 MeVα-particles. In addition in-beam data were obtained by measuringγ-ray singles spectra, angular distributions andγγ-coincidences, following the144Sm(α, 4n+ p, γ) reaction. A level scheme for143Eu comprising 19 levels is proposed, spin assignments or at least restrictions are given. The deduced experimental level scheme can be reproduced semiquantitatively by a generalized decoupling model which takes into account an asymmetric deformation of the core and a variable moment of inertia. Additionally, the results are discussed in the limit of the weak coupling model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01433704
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  • 10
    Electronic Resource
    Electronic Resource
    Microscopic calculation of the collective motion in76Kr (1983)
    Springer
    The European physical journal 314 (1983), S. 227-237 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A microscopic calculation of Bohr's collective Hamiltonian is used to describe the collective motion in the76Kr isotope. A single-particle basis calculated in a deformed Woods-Saxon potential leads to the potential energy surface obtained by the Strutinsky renormalization procedure, and to the inertial functions determined in the cranking model approximation. The collective Schrödinger equation is solved numerically. The low-energy, even parity states in76Kr are analyzed in the frame of this model. The theoretical results involve the potential energy and the inertial parameters as functions of intrinsic quadrupole deformations, the collective levels and wave functions including their transitions and electromagnetic moments. A good agreement between experiment and theory is obtained without adjusting specifically for this nucleus any parameter in the model. Some results regarding statical and dynamical characteristics of even-even74, 78, 80Kr isotopes are also presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01879882
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