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  • 1
    Electronic Resource
    Electronic Resource
    Efimov states for three 4He atoms? (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 3906-3912 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The system of three 4He atoms interacting through the intermolecular potential HFDHE2 is solved exactly within the Faddeev scheme. We find that the trimer has two bound states at E=−0.11 K and E=−0.16(−2) K, where the excited state shows the property of an Efimov state. It is overrun by the two-body fragmentation threshold for an artificially enhanced overall interaction strength. Uncertainties in the potential parameters, possibly combined with solvent effects, may allow a slightly weaker force, which supports a second Efimov state. In any case dynamical effects of the Efimov states will be the same whether it lies close to E=0 on the physical or unphysical sheet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.450912
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Painlevé test and exact similarity solutions of a class of nonlinear diffusion equations (1992)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 33 (1992), S. 2456-2463 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: For (1+1)-dimensional diffusion equations where the diffusion coefficient is an arbitrary power of the dependent variable, a Painlevé test is performed on both the partial differential equation and the similarity reductions. The invariance of the Painlevé property under a large class of similarity reductions is shown. For the reductions with the Painlevé property, the explicit similarity solutions are given. It is demonstrated how results of a Painlevé analysis can be used to obtain further exact similarity solutions, even in cases without the Painlevé property.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.529615
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  • 3
    Electronic Resource
    Electronic Resource
    Relativistic two-body bound state in motion (1992)
    Springer
    Few body systems 13 (1992), S. 1-10 
    Details
    ISSN: 1432-5411
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract For an approximately relativistic Hamiltonian properties of a two-body bound state are investigated as a function of the total momentum. These are the relativistic energy-momentum relation for the bound-state energy eigenvalue, integral and local deformation properties of the bound-state wave function, and the weakly singular short-range behaviour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01080206
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  • 4
    Electronic Resource
    Electronic Resource
    Energy dependence of nucleon-deuteron elastic scattering observables and its bearing on the3 P J nucleon-nucleon interactions (1992)
    Springer
    Few body systems 13 (1992), S. 11-18 
    Details
    ISSN: 1432-5411
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The energy dependence of neutron-deuteron elastic scattering observables has been calculated from 5 to 45 MeV via rigorous three-nucleon calculations using the Bonn B nucleon-nucleon interaction. The goal of these calculations was to identify energy and angular regions that may be investigated experimentally to study the question of charge-symmetry breaking in the3 P J nucleon-nucleon forces and/or Coulomb interactions. It was found that the measurement of the neutron-deuteron elastic analyzing power at 16 and 22.7 MeV and its comparison to proton-deuteron data obtained at the same incident energy is the most promising case for studying the issue of charge-symmetry breaking in the3 P J nucleon-nucleon forces and/or Coulomb interactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01080207
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  • 5
    Electronic Resource
    Electronic Resource
    Energy dependence of possible charge-independence- and charge-symmetry-breaking effects inNN 3 P J interactions from three-nucleon continuum studies (1992)
    Springer
    Few body systems 13 (1992), S. 189-198 
    Details
    ISSN: 1432-5411
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A recent study of charge-independence-and charge-symmetry-breaking effects in the3 P J nucleon-nucleon interactions has been extended down to 5 MeV nucleon energy. It has been found that charge-independence-breaking effects are almost energy independent in the entire energy range investigated. Possible charge-symmetry-breaking effects in the3 P J NN interactions exhibit a rather strong energy dependence at very low energies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01080538
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  • 6
    Electronic Resource
    Electronic Resource
    Phase Shifts and Mixing Parameters for Elastic Neutron-Deuteron Scattering Above Breakup Threshold (1995)
    Springer
    Few body systems 19 (1995), S. 175-193 
    Details
    ISSN: 1432-5411
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. Complex eigenphases and mixing parameters for elastic n-d scattering above the breakup threshold are calculated. Faddeev equations are solved precisely using the Bonn-B NN potential. We point out defects in existing N-d phase-shift analyses. Peculiar energy variations in the mixing parameter η3/2− are shown to have no effect on observables and are simply an artifact of the S-matrix parametrization. It is shown, that the n-d analyzing power A y depends most sensitively on the three eigenphases δ1/2 3/2/1, δ2/3 3/2/1, and δ5/2 3/2/1, which again are predominantly generated by the 3 P j NN force components. Therefore a determination of those eigenphases from experimental data would help to constrain the 3 P j NN forces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s006010050025
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  • 7
    Electronic Resource
    Electronic Resource
    Die unteren Anregungsstufen des Kerns23Na nach dem Kollektivmodell (1964)
    Springer
    The European physical journal 178 (1964), S. 53-63 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Zusammenfassung Es wird der Versuch unternommen, das Kollektivmodell für stabil deformierte Kerne auf die ersten sieben Anregungszustände von23Na anzuwenden. Es gelingt, die experimentellen Lagen der Niveaus gut wiederzugeben, die experimentellen Spins zu bestätigen und einige fehlende Spins vorauszusagen. Dazu werden vier Rotationsbanden vermischt und damit sämtliche tiefliegenden inneren Anregungsmöglichkeiten, die das Nilsson-Modell zuläßt, berücksichtigt. Die relativen Lagen derK-Banden und die Kopplungskonstanten können in ausreichender Weise dem Nilsson-Modell entnommen werden. Es wurde festgelegt durchμ=0,κ=0,07,η=4, $$\hbar \mathop \omega \limits^\bigcirc _0 = 41 \cdot A^{^{ - \frac{1}{3} } } MeV$$ . Bei der Anpassung wurde nur ein Trägheitsmoment benützt, das etwas kleiner ist als die hydrodynamische Abschätzung.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01375483
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  • 8
    Electronic Resource
    Electronic Resource
    Numerical treatment of few body equations in momentum space by the Spline method (1982)
    Springer
    The European physical journal 305 (1982), S. 217-221 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A method is proposed to handle integral equations with moving singularities which typically show up in few body problems. This is a modification of the standard Spline algorithm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01417437
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  • 9
    Electronic Resource
    Electronic Resource
    Fractional relaxation and the time-temperature superposition principle (1994)
    Springer
    Rheologica acta 33 (1994), S. 337-343 
    Details
    ISSN: 1435-1528
    Keywords: Rheological models ; viscoelasticity ; fractional differentiation ; non-Debye relaxation ; thermo-rheological simplicity ; projection operator
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract Relaxation processes in complex systems like polymers or other viscoelastic materials can be described by equations containing fractional differential or integral operators. In order to give a physical motivation for fractional order equations, the fractional relaxation is discussed in the framework of statistical mechanics. We show that fractional relaxation represents a special type of a non-Markovian process. Assuming a separation condition and the validity of the thermo-rheological principle, stating that a change of the temperature only influences the time scale but not the rheological functional form, it is shown that a fractional operator equation for the underlying relaxation process results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00366960
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  • 10
    Electronic Resource
    Electronic Resource
    Book reviews (1987)
    Springer
    Few body systems 2 (1987), S. N33 
    Details
    ISSN: 1432-5411
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01078978
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    Paper (German National Licenses)
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