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  • 1995-1999  (9)
  • 1960-1964  (1)
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  • 1
    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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    Paper (German National Licenses)
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  • 2
    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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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Proton-Induced Deuteron Breakup at E lab P = 65 MeV in Quasi-Free Scattering Configurations (1996)
    Springer
    Few body systems 20 (1996), S. 27-40 
    Details
    ISSN: 1432-5411
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. The proton-deuteron breakup cross sections and analyzing powers A y for three kinematically complete configurations in a quasi-free-scattering geometry have been measured at E lab P = 65 MeV. The data are compared with predictions of rigorous Faddeev calculations using the Argonne AV14, Bonn-B, Nijmegen-78, and Paris potentials. A satisfactory agreement between theory and experimental data, both for cross sections and analyzing powers, has been found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s006010050029
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Extraction of the Neutron-Neutron Scattering Length a nn from Kinematically Complete Neutron-Deuteron Breakup Experiments (1996)
    Springer
    Few body systems 20 (1996), S. 81-92 
    Details
    ISSN: 1432-5411
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. Data for the neutron-neutron final-state-interaction cross section obtained recently in a kinematically complete neutron-deuteron breakup experiment have been reanalyzed using rigorous solutions of the three-nucleon Faddeev equations with realistic nucleon-nucleon interactions. A discrepancy was found with respect to a recent analysis based on the W-matrix approximation to the Paris potential. We also estimate theoretical uncertainties in extracting the neutron-neutron scattering length resulting from the use of different nucleon-nucleon interactions and the possible action of the two-pion-exchange three-nucleon force. We find that there exists a certain production angle for the interacting neutron-neutron pair where the uncertainties become minimal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s006010050033
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Nonlocality in the Nucleon-Nucleon Interaction Due to Minimal-Relativity Factors: Effects on Two-Nucleon Observables and the Three-Nucleon Binding Energy (1996)
    Springer
    Few body systems 21 (1996), S. 25-45 
    Details
    ISSN: 1432-5411
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. Minimal-relativity factors, when multiplied to a static local mesonexchange nucleon-nucleon potential, lead to a nonlocal potential. It is shown that the nonlocality can be represented by an analytically given nonlocality function, which has a width inversely proportional to the nucleon mass and which tends towards δ(r − r), the usual locality condition, in the limit of the nucleon mass going to infinity. Consequences of this particular type of non-locality for two-nucleon observables and for the three-nucleon binding energy are investigated along with a Malfliet-Tjjon-type potential. After readjusting the potential parameters of the nonlocal potential such that its two-nucleon properties are well matched to the ones of the static local potential the effect of the nonlocality on the three-nucleon binding energy essentially vanishes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s006010050039
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    A New Look into the Partial-Wave Decomposition of Three-Nucleon Forces (1997)
    Springer
    Few body systems 22 (1997), S. 107-135 
    Details
    ISSN: 1432-5411
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. We demonstrate that the partial-wave decomposition of three-nucleon forces used up to now in momentum space has to be necessarily unstable for high partial waves. This does not affect the applications performed up to now, which were restricted to low partial waves. We present a new way to perform the partial-wave decomposition free of that defect. This is exemplified for the most common two-pion-exchange Tucson-Melbourne three-nucleon force. For the lower partial waves the results of the old method are reproduced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s006010050057
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Two-Body T-Matrices Without Angular-Momentum Decomposition: Energy and Momentum Dependences (1998)
    Springer
    Few body systems 24 (1998), S. 55-79 
    Details
    ISSN: 1432-5411
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. The two-body T-matrix is calculated directly as function of two vector momenta for different Malfliet-Tjon-type potentials. At a few hundred MeV projectile energy the total amplitude is quite a smooth function showing only a strong peak in forward direction. In contrast, the corresponding partial-wave contributions, whose number increases with increasing energy, become more and more oscillatory with increasing energy. The angular and momentum dependence of the full amplitude is studied and displayed on as well as off the energy shell as function of positive and negative energies. The behaviour of the T-matrix in the vicinity of bound-state poles and resonance poles in the second energy sheet is studied. It is found that the angular dependence of T exhibits very characteristic properties in the vicinity of those poles, which are given by the Legendre function corresponding to the quantum number either of the bound state or the resonance (or virtual) state. This behaviour is illustrated along numerical examples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s006010050076
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Polarization-Transfer Coefficients in and Reactions at MeV: Experiment Compared to Calculations with Recent Nuclear-Interaction Models (1998)
    Springer
    Few body systems 25 (1998), S. 133-155 
    Details
    ISSN: 1432-5411
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. The polarization-transfer coefficients K , K and K , K have been measured in the elastic scattering reactions D( , )p and D( , )d at MeV, respectively. They are compared to solutions of the three-nucleon Faddeev equations obtained with the recent nucleon-nucleon interactions AV18, CD Bonn, NijmI and II. Effects of the Tucson-Melbourne three-nucleon force, adjusted separately to reproduce the triton binding energy for each of these potentials, are studied. Both and exhibit a scaling behaviour with the triton binding energy. For and the various predictions with two-nucleon forces only agree practically with each other but spread after inclusion of the three-nucleon force. The agreement of theory and data is fair but the neglect of the proton-proton Coulomb force precludes a final conclusion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s006010050099
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Three-Body Bound-State Calculations Without Angular-Momentum Decomposition (1999)
    Springer
    Few body systems 27 (1999), S. 83-105 
    Details
    ISSN: 1432-5411
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract.  The Faddeev equations for the three-body bound state are solved directly as three-dimensional integral equation without employing partial wave decomposition. The numerical stability of the algorithm is demonstrated. The three-body binding energy is calculated for Malfliet-Tjon-type potentials and compared with results obtained from calculations based on partial wave decomposition. The full three-body wave function is calculated as function of the vector Jacobi momenta. It is shown that it satisfies the Schrödinger equation with high accuracy. The properties of the full wave function are displayed and compared to the ones of the corresponding wave functions obtained as finite sum of partial wave components. The agreement between the two approaches is essentially perfect in all respects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s006010050124
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Retardation experiments in glass-forming liquids and their description in terms of the conformon model (1996)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 47 (1996), S. 150-160 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Relaxation in glass-forming liquids as measured by dielectric, by light- and by neutron-scattering experiments can be described with the aid of the conformon model. Conformons behave like bosons which display a photon statistics. Conformons are excited and can also be annihilated. They show a universal reduced energy density distribution, revealing their thermodynamic roots. Each relaxation mode is assumed to be directly connected with a distinct conformon. The coupling is described by an empirical power law. The actual relaxation time distribution is then obtained by scaling each relaxation mode with the same kinetic factor. The relaxation behavior of liquids is therefore self-similar, characterized by individual factors such as the relaxation power, the coupling parameter and the temperature of pressure dependence of the kinetic factor (“shift factor”).
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1996.010470403
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    Paper (German National Licenses)
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