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  • 1980-1984  (4)
  • 1975-1979  (4)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Microscopic determination of energy surfaces at very high spin states (1977)
    Springer
    The European physical journal 282 (1977), S. 267-276 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Deformation energy surfaces for very high angular momentum states in the rare earth nuclei are calculated microscopically forβ andγ deformations using a pairing, quadrupole and Coulomb Hamiltonian. The parameters of the Hamiltonian are adjusted to the ground state deformations and the odd-even mass differences. It is found that even with the Nilsson basis one may obtain the correct asymptotic moment of inertia by omitting a few high lying large angular momentum basis states which are depressed too much by thel 2 term. Similarities and discrepancies between the proposed microscopic model and the Strutinsky calculations are displayed and discussed. The advantages as well as the limitations of the microscopic description presented here are analysed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01414894
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Description of negative parity yrast states in156Er (1977)
    Springer
    The European physical journal 283 (1977), S. 349-356 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Positive and negative parity yrast states are studied in 68 156 Er88 with a particle number projected Hartree-Fock-Bogoliubov method constrained on an average angular momentum. The theory predicts a second anomaly of the positive parity yrast states due to the alignment of ah 11/2 proton pair. The double backbending in the negative yrast band is understood: AtJ π=9− to 11− it is due to the intersection of the (πg 7/27/2+)×(πh 11/27/2−) and the (πi 13/21/2+)×(πh 9/23/2−) 2q.p. bands. The second backbending found experimentally fromJ π=21− to 23− is connected with an alignment of ai 13/2 neutron pair of the core in the proton 2q.p. band.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01409514
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    Paper (German National Licenses)
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  • 3
    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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  • 4
    Electronic Resource
    Electronic Resource
    Description of high-spin isomers in theN=82 region (1980)
    Springer
    The European physical journal 295 (1980), S. 87-101 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The high spin states and of those especially the yrast isomers are studied in the region near the rare earth nuclei. The deformation energy surface is calculated with a method modelled in principle according to a shape constrained cranked HF theory (CHF). In practice, the expectation value of the many-body Hamiltonian is calculated with cranked Nilsson functions. One finds rotation around a slightly deformed oblate or prolate symmetry axis in front or behind the rare earth region, respectively. Near the Hf isotopes strongly prolate deformed nuclei rotating around the symmetry axis are found in agreement with the knownK isomers in this region. These results are explained also qualitatively with the help of the MONA (Maximisation of theOverlap ofNucleonic wave functions byAlignment of single particle angular momenta) effect. In the second part high spin states and yrast isomers in theN=82 region are calculated in the cranked Hartree-Fock-Bogoliubov approach with four and six quasi-particle excitations. For the excitation energies in146Gd and152Dy and a measuredg factor one finds satisfactory agreement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01414302
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Description of high-spin isomers in theN=82 region (1980)
    Springer
    The European physical journal 296 (1980), S. 237-250 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The high spin states and of those especially the yrast isomers are studied in the region near the rare earth nuclei. The deformation energy surface is calculated with a method modelled in principle according to a shape constrained cranked HF theory (CHF). In practice, the expectation value of the many-body Hamiltonian is calculated with cranked Nilsson functions. One finds rotation around a slightly deformed oblate or prolate symmetry axis in front or behind the rare earth region, respectively. Near the Hf isotopes strongly prolate deformed nuclei rotating around the symmetry axis are found in agreement with the knownK isomers in this region. These results are explained also qualitatively with the help of the MONA (Maximisation of theOverlap ofNucleonic wave functions byAlignment of single particle angular momenta) effect. In the second part high spin states and yrast isomers in theN=82 region are caluclated in the cranked Hartree-Fock-Bogoliubov approach with four and six quasi-particle excitations. For the excitation energies in146Gd and152Dy and a measuredg factor one finds satisfactory agreement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01415838
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    An investigation of the tensor force effects on the spin-orbit splitting in spherical and very deformed nuclei (1981)
    Springer
    The European physical journal 299 (1981), S. 119-130 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A contribution of the tensor force to the phenomenological spin-orbit (SO) potential in the single-particle Hamiltonian is studied for spherical and deformed rare-earth and actinide nuclei. It is found that the deformation dependence of the SO coupling constant, suggested by the second order tensor force contribution, enables to explain the observed single particle (s.p.) states in the second minimum of237Pu and239Pu using a SO strength weaker than usually applied. Consequences of the tensor contributions for the stability of theZ=114 superheavy nucleus are studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01440913
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    g Factors for high-spin states of238U (1983)
    Springer
    The European physical journal 309 (1983), S. 365-366 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Calculations of the g-factor and the moment of inertia J for high-spin states of238U are performed using the model which is based on the cranking Hartree-Fock-Bogolyubov (CHFB) theory. Importance of the state-dependent pairing force on 3(ω2) is investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01413842
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Angular momentum and energy dependence of fission andn, p,4He emission from194Hg compound nucleus (1979)
    Springer
    The European physical journal 291 (1979), S. 331-337 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Spin and temperature dependence of the fission and particle emission is studied for194Hg. The compound nucleus is described using the Strutinsky shell correction approach extended for finite angular momenta and temperature. The shell corrections to the potential energy, free energy and the angular momentum are calculated using the Woods-Saxon average field. Results are compared with the experimental data and show a good qualitative agreement. It is found that the inclusion of the shell effects is necessary to understand the decay properties of194Hg even for temperatures as high as 1.5–2.0 MeV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01408383
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    Paper (German National Licenses)
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