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  • 1980-1984  (3)
  • 1975-1979  (6)
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  • 1
    Electronic Resource
    Electronic Resource
    Short range behaviour of the N-N potential within the quark Model (1980)
    Springer
    The European physical journal 294 (1980), S. 173-181 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The short range behaviour of the nucleon-nucleon (NN) potential is studied in terms of the quark model, where nucleons are assumed to consist of three colored quarks. By considering the overlap kernel of the wave function of the resonating group method (RGM), it is found that the Pauli effect does not produce a ‘hard core’. Instead, the gluon exchange interaction with the confinement requirement suggests a rather soft one. TheΔ-Δ isobar interaction is also considered. In the (S, T) = (3, 3), (3, 2) and (2, 3) channels we find a ‘hard core’, while calculations in some other cases indicate even strong short range attractions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01435053
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The tensor force in heavy nuclei: High momentum collectivity of unnatural parity excitations (1980)
    Springer
    The European physical journal 295 (1980), S. 187-195 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The possibility of collectivity at high momentum transfer in unnatural parity states in finite nuclei, is outlined. This phenomenon is produced by the strong tensor force in the one pion exchange interaction operating coherently in a large oscillator space. The collectivity is observed at momentaq∼(2-3)m π corresponding to the critical momentum of pion condensation. If existent, such collective behaviour is expected to be seen in differential cross sections, e.g. for proton inelastic scattering, leading to unnatural parity states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01413076
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Quenched magnetic transitions from high spin states in light nuclei (1983)
    Springer
    The European physical journal 312 (1983), S. 247-249 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Recent investigations of stretchedM 6 transitions in thes-d shell have uncovered the unexpected systematic trend that isoscalarM 6 transitions are two to three times more retarded than the isovector ones. We present the result of a microscopic calculation analyzing the different mechanisms usually invoked in the formation of the quenching and suggest that an additional argument based on the difference in structure between isoscalar and isovector transition densities may be playing a predominant role in explaining the data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01412167
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Extended VMI model for asymmetric deformed nuclei (1976)
    Springer
    The European physical journal 276 (1976), S. 35-43 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The nature of the ground and theγ band is studied in the asymmetric rotator model for larger asymmetric deformationsγ and higher angular momenta. Properties of theγ band are found which may make it possible to search experimentally for staticγ deformations. Sum rules for quadrupole moments and energies are derived. For the description of higher angular momenta the softness of the nucleus is included by an extension of the VMI model to asymmetric deformations. Energies, quadrupole moments andE 2 transitions are given for the Os region and compared with the available data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01414591
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    Paper (German National Licenses)
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  • 5
    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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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Staggering of even and odd spin states in196, 198Tl nuclei (1978)
    Springer
    The European physical journal 287 (1978), S. 121-122 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Recent experimental results for 81 196 Tl115 along with that of 81 198 Tl115 are analysed. It is shown that staggering observed in the excitation energy of the even and odd spin states in these odd-odd mass transitional nuclei is due to the residual interaction between the two odd particles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01408367
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Study of transitional odd-odd mass nuclei (1979)
    Springer
    The European physical journal 292 (1979), S. 79-94 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The low lying high spin states in the transitional odd-odd mass nuclei are studied systematically in the framework of gamma deformed rotor model. The two odd particles, a proton and a neutron, are treated as the BCS quasi particles moving in a triaxially deformed field. The calculations are confined to smallβ-deformation which is typical of the transitional nuclei. Moreover, we consider only the case where two odd particles are in singlej-shells. Results for the excitation energy covering the various physical situations are presented as a function of theβ-deformation, the asymmetryγ, and the Fermi energiesλ p andλ n . Electromagnetic transitions and moments are also calculated. Certain features well known in the odd mass nuclei are shown to persist also in the odd-odd mass system. Trends in the level systematics and the electromagnetic properties are predicted for the case where both particles decouple or remain strongly coupled, and for the case where one decouples and the other couples strongly with the core. Measurements which are getting now available show encouraging agreement with the theoretical results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01434634
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Investigation of the pion condensation threshold in finite nuclei (1979)
    Springer
    The European physical journal 292 (1979), S. 389-395 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The threshold condition for pionic instabilities in finite nuclei is investigated by evaluating the response function for pion-like nuclear excitations (i.e. isovectorJ π =0−, 1+, 2−, ... excitations). The onset of pion condensation is then defined as the point where the response function for givenJ π becomes infinite at frequencyω=0. Using a momentum space representation for the response function which allows to establish clear connections to the nuclear matter case, we find that for angular momentaJ smaller than a maximum value which depends on the size of the nucleus, the threshold condition is almost the same as for infinite matter. We also study the systematics of this phenomenon as a function of nuclear mass number.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01546438
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Rotation of nuclei around a prolate symmetry axis at very high spin states (1978)
    Springer
    The European physical journal 287 (1978), S. 103-119 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Classically one expects that nuclei rotate at very high spins (30≦I≦80) around an oblate symmetry axis. It is shown that strong shell correction energies yield for some nuclei at the end of the rare earth region and in the Pb-region yrast states for a rotation around a prolate symmetry axis. Like for the rotation around an oblate symmetry axis one expects also here yrast traps. The deformation energy surfaces for very high spin states are calculated by the Strutinsky method using a Saxon-Woods potential and by a microscopic method built on constraint Nilsson functions. Both methods agree qualitatively. Yrast traps are studied for these nuclei. It is shown that the MONA (Maximisation of theOverlap ofNuclear wave functions byAlignment) effect prefers at high spin rotation around the symmetry axis of a negative deformed shape at the beginning of the shell and of positive deformation at the end of the shell.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01408366
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    Paper (German National Licenses)
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