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  • 1
    Electronic Resource
    Electronic Resource
    The surface delta interaction in the transuranic nuclei (1967)
    Springer
    The European physical journal 203 (1967), S. 333-345 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Surface Delta Interaction (SDI) is employed to calculate the ernergy of gamma-vibrational and theK=0, 1, 2, and 3 Octupole vibrational band heads in the even-mass Transuranic nuclei. The quasi-particle Random Phase (RPA) and the quasi-particle Tamm Dancov approximations (TDA) are utilized to solve the Hamiltonian. The resulting energies and gamma transitions are compared with the Pairing plus Quadrupole (PQF) or Octupole (POF) force model and the available experimental data. The agreement between theory and experiment is satisfatory. Only theK=0, 1, and 2 Octupole bands are collective. TheK=3 negative parity state is practicaly a pure two quasi-particle state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01331060
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  • 2
    Electronic Resource
    Electronic Resource
    Orbital rearrangement in thesd-shell nuclei (1969)
    Springer
    The European physical journal 223 (1969), S. 192-198 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The single particle orbital rearrangement energy is found to lie between 30 and 50% of theBrueckner rearrangement energy in thesd-shell. This calculation shows that the orbital rearrangement energyR α is in a good approximation equal to half the difference of the single particle energies ɛα in the system withA particles and in the system withA- 1 particles having a hole in the state ¦α〉.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01392983
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  • 3
    Electronic Resource
    Electronic Resource
    The Bahcall corrections to electron capture and the Hartree-Fock rearrangement (1970)
    Springer
    The European physical journal 238 (1970), S. 352-359 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Bahcall correction factorsX L/K andX M/L forL/K andM/L electron capture ratio respectively are calculated including the Hartree-Fock (HF) rearrangement. The rearrangement takes into account that the atom after the electron capture is not in the HF ground state. The selfconsistent single electron orbits for the excited states with a hole in theK,L orM shell are calculated using the Herman-Skillman and the Froese HF codes. The rearrangement changes the correction factor into the right direction, but the reduction is too small. Only for very light atoms the alteration is larger than 1% and therefore it is in general smaller than the present experimental errors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01395474
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  • 4
    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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  • 5
    Electronic Resource
    Electronic Resource
    Microscopic calculation of pion production in nucleus-nucleus collisions around 1 GeV·A (1991)
    Springer
    The European physical journal 340 (1991), S. 271-279 
    Details
    ISSN: 1434-601X
    Keywords: 25.70 ; 14.40.Aq ; 21.65. + f
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The pion production cross section in nucleus-nucleus collisions at aboutE lab/A=1 GeV is calculated within the relativistic (RQMD) and the nonrelativistic quantum molecular dynamics (QMD) approach. We use both soft and hard equations of state (EOS) with and without the momentum dependence in the interaction. For the nucleon-nucleon (NN) cross section, isospin-dependent Cugnon parameterization and BruecknerG-matrix ones are utilized. A parameterized cross section is used for pion production in baryon-baryon collisions. The reabsorption of pions in the nuclear medium is taken into account in an empirical way. A detailed comparison is made between the pion production cross sections obtained in RQMD and QMD, with soft and hard EOS, with and without the momentum dependence in the in-medium NN interaction, with different NN cross sections and with different pion mean free paths. The agreement between the theoretical results and available experimental data is encouraging, although no definite and systematical evidence is found concerning the incompressibility of nuclear matter and the significance of a fully Lorentz covariant treatment of heavy-ion collisions at present energy domain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294675
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  • 6
    Electronic Resource
    Electronic Resource
    Multi-configuration Hartree-Fock theory in nuclei (1969)
    Springer
    The European physical journal 220 (1969), S. 88-100 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A variational method for the self-consistent solution of the nuclear many body problem with the inclusion of correlations is formulated. The trial function in this multiconfiguration-Hartree-Fock (MCHF) theory is a linear combination of unrestricted Slater determinants. The MCHF equations are given and a simple procedure for solving them is outlined. A great advantage of this method is that it also yields the excited states. It is shown that the trial function is stable against particle-hole excitations. Therefore the Slater determinants differ from each other at least by two particle — two hole excitations. This method is applied to the Lipkin model. In the MCHF method the difference to the exact solution is reduced by a factor three to ten compared with the corresponding value in the HF approach.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01394412
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  • 7
    Electronic Resource
    Electronic Resource
    Vergleich der Davydov-Theorie mit dem Modell des achsialsymmetrischen Kreisels mit Rotation-Vibrations-Wechselwirkung für deformiertegg-Kerne (1964)
    Springer
    The European physical journal 177 (1964), S. 190-205 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract For deformed even-mass nuclei the model of the axial-symmetric vibrating top with rotation-vibration-interaction is compared to the Davydov-model without and with aβ-band. TheE2-transition-probabilities are calculated. The coefficientsB ze andC fromE=A I(I+1) −B ze I 2(I+1)2+C I 3(I+1)3 are obtained. For the transition-probabilities from the states of the γ-band to the states of the ground state band as well as forB andC the Davydov-model yields values only about half of those obtained from the RV-theory. A comparision to the present availuable experimental data is made. In the RV-model the agreement is better than in the Davydov-theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01375337
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  • 8
    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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  • 9
    Electronic Resource
    Electronic Resource
    Die Rotations-Vibrations-Wechselwirkung in deformiertengg-Kernen (1962)
    Springer
    The European physical journal 168 (1962), S. 425-464 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract For even-even nuclei a theory of rotation-vibration-interaction is established. The basic point is the axial-symmetric intrinsic-core of the Bohr-Mottelson-theory. It is our aim — just as inDavydov-Fillipov's theory of the asymmetric rotator — to calculate theE 2-transition-probabilities from the 1.γ-band to the ground-band and the comparision of the results with experiments. The agreement between theory and experiment is good.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01387041
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  • 10
    Electronic Resource
    Electronic Resource
    Zur potentiellen Energie derγ-Schwingungen in deformiertengg-Kernen (1962)
    Springer
    The European physical journal 170 (1962), S. 105-113 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Zusammenfassung Bei der Umrechnung des Hamilton-Operators für die im Laborsystem formulierte Gesamtenergie auf das Intrinsic-System entsteht dann ein anharmonischer Zusatzterm für die potentielle Energie, wenn als Volumenelementdτ(a 0 a 2)=da 0 da 2 gewählt wird. Man hat dann die Möglichkeit durch geeignete Wahl der potentiellen Energie den anharmonischen Zusatzterm zu kompensieren und damit harmonische Kernschwingungen zu fordern. Das ist hier nicht geschehen, vielmehr ist der Einfluß der Anharmonizität der Kernschwingungen aufE2-Übergänge und die Lage der Energieterme untersucht und mit dem Experiment verglichen worden. Die Entscheidung, ob der Kernrumpf harmonisch oder anharmonisch schwingt, ist im Augenblick noch nicht möglich.
    Notes: Abstract By transformation of the collective Hamiltonian from the laboratory-system to the intrinsic-system one obtains an anharmonic term in the potential energy, if one chooses the volume-element to bedτ(a 0 a 2)=da 0 da 2. The consequence of this term on energies and transition-probabilities are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01378313
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