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  • 1
    Digitale Medien
    Digitale Medien
    Hydrodynamic instability of shells accelerated by direct ion beam heating (2002)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 9 (2002), S. 1348-1356 
    Details
    ISSN: 1089-7674
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The Rayleigh–Taylor (RT) instability of planar shells accelerated by direct heating of an underlying absorber layer is analyzed. A specific feature of the problem considered is a fixed in space energy deposition region, which allows the unstable transition layer to develop only gradually as the heated matter is pushed out of the deposition region. The linear growth spectrum ω(k) is investigated by relating a simple analytic estimate for a stationary exponential transition layer with the results of two-dimensional hydrodynamic simulations. For the unperturbed motion, an analytic solution is used which describes a uniform acceleration of the payload driven by a time-dependent uniform heating of the absorber with a fixed spatial extension. It is shown that an enhancement factor of 1.5(h/d), where h is the effective half-thickness of the heated region and d is the in-flight thickness of the payload, can be achieved for the distance-moved-over-thickness ratio as compared to the classical RT case of a strong density jump. © 2002 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1462634
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  • 2
    Digitale Medien
    Digitale Medien
    Medium energy collisions of heavy nuclei in the three-dimensional nuclear fluid dynamical-(NFD) and Time-Dependent Hartree-Fock (TDHF) models (1980)
    Springer
    The European physical journal 294 (1980), S. 125-135 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We study heavy ion collisions at bombarding energiesE LAB/n∼ 20–200 MeV within the three-dimensional NFD- and TDHF-models. A surprisingly good agreement between the results of the different models is found: The comparison phenomena occuring at these bombarding energies are quantitatively similar as a function of the bombarding energy as well as for various impact parameters. The formation of abnormal superdense nuclear matter (“density isomers”) is investigated in a schematic model for the nuclear equation of state. Again we find very similar results in the two models. Density isomers can be formed in high energy heavy ion collisions above a critical bombarding energy and below a critical impact parameter, which both depend on the details of the nuclear equation of state. Cross sections for the formation of density isomers are presented. An experiment for the detection of abnormal nuclear matter in fast, central heavy ion collisions is proposed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01435047
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  • 3
    Digitale Medien
    Digitale Medien
    Fusion-fission, superheavy molecular-capture and symmetric fragmentation in 3D-TDHF calculations of the reactions238U,208Pb(4.6-8.0MeV/u)64Ni,48Ca (1982)
    Springer
    The European physical journal 306 (1982), S. 235-238 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract In 3D-TDHF calculations of heavy asymmetric nuclear collisions we find four classes of reactions. At low impact parameters the system captures, whereas at large impact parameters deep inelastic collisions occur. For differentE Lab,L in and mass asymmetries this leads to(i) strong drift to symmetry with later fragmentation,(ii) formation of long-lived very-heavy nuclear molecules or(iii) fusion and slow drift to sphericity. The calculated capture cross-sections vs.E Lab are consistent with recent data.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01415125
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  • 4
    Digitale Medien
    Digitale Medien
    Pulsating blobs of quark matter in relativistic nuclear collisions (1980)
    Springer
    The European physical journal 295 (1980), S. 401-402 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The formation of hot, dense quark matter in violent high energy heavy ion collisions is discussed in a relativistic hydrodynamical model. Rapidly pulsating blobs of quark matter (treated in the bag model) are predicted to appear as a result of the expansive flow of the compressed quark matter against the contracting influence of confinement. The radial oscillations may result in pulsed matter emission.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01412953
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  • 5
    Digitale Medien
    Digitale Medien
    Calculation of shape-isomeric-states with an extended Rotation-Vibration-Model (1981)
    Springer
    The European physical journal 301 (1981), S. 301-308 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We extend the Rotation-Vibration Model of Faessler and Greiner [1] assuming deformation dependent masses in the ansatz for the kinetic energy. With these additional terms we get a good description valid also for high deformations. The moment of inertia is well reproduced in both minima of the potential-energy surface. Shape-isomeric states, low energy levels and high-spin states are calculated for238U and compared with experiment.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01421693
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  • 6
    Digitale Medien
    Digitale Medien
    Pairing gaps from nuclear mean-field models (2000)
    Springer
    The European physical journal 8 (2000), S. 59-75 
    Details
    ISSN: 1434-601X
    Schlagwort(e): PACS. 21.60.Jz Hartree-Fock and random-phase approximations – 21.30.Fe Forces in hadronic systems and effective interactions – 21.60.-n Nuclear-structure models and methods
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: We discuss the pairing gap, a measure for nuclear pairing correlations, in chains of spherical, semi-magic nuclei in the framework of self-consistent nuclear mean-field models. The equations for the conventional BCS model and the approximate projection-before-variation Lipkin-Nogami method are formulated in terms of local density functionals for the effective interaction. We calculate the Lipkin-Nogami corrections of both the mean-field energy and the pairing energy. Various definitions of the pairing gap are discussed as three-point, four-point and five-point mass-difference formulae, averaged matrix elements of the pairing potential, and single-quasiparticle energies. Experimental values for the pairing gap are compared with calculations employing both a delta pairing force and a density-dependent delta interaction in the BCS and Lipkin-Nogami model. Odd-mass nuclei are calculated in the spherical blocking approximation which neglects part of the the core polarization in the odd nucleus. We find that the five-point mass difference formula gives a very robust description of the odd-even staggering, other approximations for the gap may differ from that up to 30% for certain nuclei.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s100530050009
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  • 7
    Digitale Medien
    Digitale Medien
    Collision of238U+238U using a three-dimensional TDHF-BCS model (1980)
    Springer
    The European physical journal 294 (1980), S. 257-260 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The time dependent Hartee-Fock-BCS code used to study118Pd+118Pd has been extended to study238U +238U at 7.5 MeV/A, in three dimensions, in order to look for the fission of the residual nuclei. Two impact parameters corresponding toL in=150,300 ħ are considered. 69 orbits are included in the effective charge quartet model. The energy loss and deflection angle are compatible with the available data and correspond to cases where fission of the residual system is observed experimentally. No fast fission of the final U fragment is predicted, but new details about clutching time, interaction times, dissipation times and other properties of the reaction mechanism such as neck dynamics, are obtained. No surface vibrations are seen.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01438163
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  • 8
    Digitale Medien
    Digitale Medien
    Detection of possible density isomers by means of high energy reaction products (1981)
    Springer
    The European physical journal 303 (1981), S. 111-114 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We present a drastic effect in the cross section of high energy target fragments caused by a possible density isomer in the nuclear equation of state. The fluid dynamical model used here contains dissipative processes such as shear viscosity and heat conduction as well as a thermodynamic evaporation model at a late stage of the nuclear collision. In our calculations we consider as an example the reaction Ne+U at an impact parameterb=4 fm.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01420267
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