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  • 1
    Electronic Resource
    Electronic Resource
    Inertial confinement fusion using hohlraum radiation generated by heavy-ion clusters (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 796-816 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This paper discusses the feasibility of employing heavy-ion cluster beams to generate thermal radiation that can be used to drive inertial fusion capsules. The low charge-to-mass ratio of a cluster may allow the driver beam to be focused to a very small spot size with a radius of the order of 100 μm, while the low energy per nucleon (of the order of 10 keV) may lead to a very short range of the driver particles in the converter material. This would result in high specific power deposition that may lead to a very high conversion efficiency. The problem of cluster stopping in cold matter, as well as in hot dense plasmas has been thoroughly investigated. The conversion efficiency of cluster ions using a low-density gold converter has also been calculated over a wide range of parameters including converter density, converter geometry, and specific power deposition. These calculations have been carried out using a one-dimensional hydrodynamic computer code that includes a multigroup radiation transport scheme [Ramis et al., Comput. Phys. Commun. 49, 475 (1988)]. The problem of symmetrization of this radiation field in a hohlraum with solid gold walls has also been thoroughly investigated using a three-dimensional view factor code. The characteristics of the radiation field obtained by this study are used as input to capsule implosion calculations that are done with a three-temperature radiation-hydrodynamic computer code MEDUSA-KAT [Tahir et al., J. Appl. Phys. 60, 898 (1986)]. A reactor-size capsule which contains 5 mg deuterium–tritium (DT) fuel is used in these calculations. The problem of using a fuel mixture with a substantially reduced tritium content has also been discussed. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872174
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  • 2
    Electronic Resource
    Electronic Resource
    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
    Source: AIP Digital Archive
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1462634
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  • 3
    Electronic Resource
    Electronic Resource
    The binding energy of 184 476 X in the droplet model (1985)
    Springer
    The European physical journal 321 (1985), S. 653-657 
    Details
    ISSN: 1434-601X
    Keywords: 21.10.−k ; 21.10.Dr ; 21.10.Ft
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The positron spectrum emitted in the U-U-reaction at subthreshold energy could be interpreted in terms of the formation of a giant nucleus if the binding of the latter is 100 MeV stronger than predicted by the usual droplet model parametrisation. We analyse the extrapolation to giant nuclei by accounting properly for the error propagation when the parameters are fitted to measured binding energies and radii. The influence of higher order terms is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01432442
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  • 4
    Electronic Resource
    Electronic Resource
    Pairing gaps from nuclear mean-field models (2000)
    Springer
    The European physical journal 8 (2000), S. 59-75 
    Details
    ISSN: 1434-601X
    Keywords: 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
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100530050009
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  • 5
    Electronic Resource
    Electronic Resource
    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
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01421693
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  • 6
    Electronic Resource
    Electronic Resource
    Rapidity distributions and energy densities from hydrodynamical studies at 5–200 GeV/n (1988)
    Springer
    The European physical journal 38 (1988), S. 237-244 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract 3+1 dimensional relativistic calculations of the space-time evolution of heavy ion collisions at bombarding energies from 5 to 200 GeV/n are presented. Collisions with heavier projectiles seem to be more rewarding to form extended regimes of highly excited nuclear matter containing enough baryons for a sufficient time span to enable a transition of the hadron matter into a quark gluon plasma. A strong impact parameter dependence has to be taken into account when comparing the final baryon rapidity distributions with experimental results. Experimental results of the reactions16O(60, 200 GeV/n)→Pb are compared with hydrodynamical calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01574542
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  • 7
    Electronic Resource
    Electronic Resource
    Ideal nuclear fluid dynamics at ultra-relativistic energies (1992)
    Springer
    The European physical journal 54 (1992), S. 459-462 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We investigate the reaction O+Au at 200 AGeV in an ideal relativistic (3+1)-dimensional one-fluid hydrodynamical model. We correct former calculations which contained acausal matter transport, leading to contradictions with experimental data for the baryonic rapidity distribution. We find that the corrected results are in good agreement with data, casting new light on the question of the applicability of ideal one-fluid hydrodynamics to heavy-ion collisions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01559465
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  • 8
    Electronic Resource
    Electronic Resource
    A three-center shell model for ternary fission (1979)
    Springer
    The European physical journal 290 (1979), S. 205-212 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We propose a generalization of the phenomenological shell model based on the harmonic oscillator potential with spin-orbit term andl 2-corrections to systems made up of three clusters. The centers of these may be in arbitrary geometrical configurations and the clusters may be of different masses. The method of determining the eigenstates of the single-particle Hamiltonian is sketched and results for the cluster structure of light nuclei and the ternary fission of a superheavy system are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01408116
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  • 9
    Electronic Resource
    Electronic Resource
    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
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01435047
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  • 10
    Electronic Resource
    Electronic Resource
    Strong compression effects in fast nuclear collisions (1979)
    Springer
    The European physical journal 293 (1979), S. 173-179 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The importance of the impact parameter for compression effects and the reaction mechanism in high energy heavy ion collisions (HEHIC) are investigated within three-dimensional nuclear fluid dynamics. For central collisions of a small projectile (Ne) with a heavy target (U) a Mach shock wave is formed resulting in the sidewards emission of matter with azimuthally symmetric fragment distribution. At intermediate impact parameters the Highly-Inelastic Bounce-Off (HIBO) appears, where the large compression potential leads to the sidewards deflection of the projectile, which then explodes. A large collective transverse momentum transfer to the target leads to azimuthally asymmetric (180° correlated) fragment distributions. The deflection angles, energy losses, mean associated multiplicities as well as the maximum compression and thermal excitation of the system are calculated as a function of the impact parameter. A characteristic deflection function is obtained which may be used to determine the impact parameter in HEHI collisions experimentally. The influence of the nuclear equation of state is discussed. The strongly differing results of central reactions and those at intermediate impact parameter seem to have been observed in preliminary data of the GSI-Marburg-LBL collaboration. This is viewed as further indication for the occurrence of strong compression phenomena in nucleus-nucleus collisions of high energy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01559758
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