[en] For thermonuclear ignition an optimized pellet implosion is necessary without destruction of the pellet's spherical symmetry and early breaking of the pellet e.g. by hydrodynamic instabilities like the Rayleigh-Taylor instability or by disadvantageous beam geometry. While the HIBALL Study realizes only 10⁰ beam angle, the investigations in this work yield an optimized beam angle of 33⁰. The sensitivity of an accelerated pellet layer against Rayleigh-Taylor instabilities also has been investigated. The author showed that a disturbance grows significantly slower than can be estimated by a linear analytical model because of vortices together with Kelvin-Helmholtz instabilities. The calculations show that the development of a Rayleigh-Taylor instability strongly depends on the shape of the initial disturbance. Secondary effects like the appearance of a second RTI-generation were observed numerically for the first time. For grain disturbances a critical layer thickness is determined for highest growth rate showing a weak maximum. Damping of the RTI growth rate by smearing over the boundary layer and by the influence of viscosity is found. (orig.)

[en] On the basis of the nuclear fluid dynamical model a kinetic energy flow analysis of high multiplicity selected collisions of ⁹³Nb (Esub(lab)=0.4 GeV/n)+⁹³Nb is performed. Finite particle number effects on the flow tensor are explicitely taken into account. Strong sidewards peaks in the distribution of event by event flow angles dN/dcostheta are in quantitative agreement with data from the new Plastic Ball electronic detection system. It is pointed out that systematic measurement of the flow tensor excitation function can yield clues to the nuclear matter equation of state. (orig.)

[en] Studying Walecka's mean-field theory we find that one can reproduce the observed binding energy and density of nuclear matter within experimental precision in an area characterized by a line in the coupling-constant plane. A part of this line defines systems which exhibit a phase transition around T/sub c/approx.200 MeV for zero baryon density. The rest corresponds to such systems where the phase transition is absent; in that case a peak appears in the specific heat around Tapprox.200 MeV. We interpret these results as indicating that the hadron phase of nuclear matter alone indicates the occurrence of an abrupt change in the bulk properties around rho/sub V/approx.0 and Tapprox.200 MeV

No abstract available

[en] The nuclear fluid dynamical model with final thermal breakup is used to study the reaction ²⁰Ne + ²³⁸U and ⁴⁰Ar + ⁴⁰Ca at E/sub LAB/ = 390 MeV/n. The calculated double differential cross sections d²sigma/dΩdE are in agreement with recent experimental data. However, it is shown that the azimuthal dependence of the triple differential distributions d³sigma/dEdcos sigma d phi, to be obtained from 4π exclusive experiments with single event analysis, can yield considerably deeper insight into the collision process and allow for snapshots of the reactions. Strongly correlated jets of nuclear matter are predicted. The jet angle, theta jet, relative to the beam axis increases from 0⁰ for peripheral collisions to 90⁰ for central collisions. A transition is predicted from a 180⁰ azimuthally correlated two jet structure at intermediate impact parameters to a doughnut-shaped azimuthally symmetric distribution for central collisions. The figure shows the azimuthal dependence of the triple differential rapidity distribution (left) and the impact parameter dependence of the angle of the jet axis, theta/sub jet/ relative to the beam axis

[en] In the present paper the authors develop the essential theoretical tools for the treatment of the dynamics of high energy heavy ion collisions. They study the influence of the nuclear equation of state and discuss the new phenomena connected with phase transitions in nuclear matter (pion condensation). Furthermore they investigate the possibility of a transition from nuclear to quark matter in high energy heavy io//con llisions. In this context exotic phenomena like strongly bound pionic states, limiting temperatures, and exotic nuclei are discussed. (author)

[en] The stability of heavy ion driven inertial confinement fusion targets is investigated within a two-dimensional Eulerian hydrodynamic code. The importance of the beam geometry is studied. Following our results the HIBALL design in its present form seems to inhibit a spherical implosion of the target. It is shown that the beam angle in the HIBALL geometry should be about 35 degrees. (orig.)

No abstract available

[en] The fluid dynamical model is used to study the reactions ²⁰Ne+²³⁸U and ⁴⁰Ar+⁴⁰Ca at E_lab = 390 MeV nuclear. The calculated double differential cross sections d²sigma/dΩdE exhibit sidewards maxima in agreement with recent experimental data. The azimuthal dependence of the triple differential distributions, to be obtained from an event-by-event analysis of 4π exclusive experiments, can yield deeper insight into the collision process: Jets of nuclear matter are predicted with strongly impact-parameter-dependent thrust angle theta_jet

[en] We compare the results of our hydrodynamic calculations with recent ⁹³Nb+⁹³Nb (Esub(lab)=400 MeV/n) data from the GSI-LBL Plastic Ball Group and with the Ar+Pb (Esub(lab)=800 MeV/n) data from the streamer chamber measurements by the GSI-LBL Heidelberg collaboration. (orig./HSI)