Refine
Year of publication
Document Type
- Article (28)
- Preprint (14)
- Conference Proceeding (2)
- Report (1)
Language
- English (45)
Has Fulltext
- yes (45)
Is part of the Bibliography
- no (45)
Keywords
- Kollisionen schwerer Ionen (8)
- heavy ion collisions (4)
- nuclear reactions (4)
- Quark-Gluon-Plasma (3)
- equation of state (3)
- Zustandsgleichung (2)
- heavy ion colliders (2)
- heavy-ion collisions (2)
- hydrodynamic description (2)
- hydrodynamical model (2)
- hydrodynamisches Modell (2)
- quark-gluon plasma (2)
- 20Ne + 238U (1)
- 232Th (1)
- 234-238U calculated B (E2) values (1)
- AGS (1)
- Ar+Ca (1)
- Bose (1)
- Bose-simulated pion production (1)
- E1ab=400 MeV/nucleon fluid dynamics (1)
- Elab=393 MeV/nucleon (1)
- Ne+U (1)
- Photon (1)
- Pion-Produktion (1)
- QGP (1)
- Quark Gluon Plasma (1)
- Relativistic heavy-ion reactions (1)
- SPS (1)
- Skalarpotential (1)
- Temperatur (1)
- Vektorpotential (1)
- Zustandsgleichungen (1)
- angular distribution (1)
- antibaryon (1)
- collective model (1)
- compressible flow (1)
- cross sections (1)
- double differential cross sections (1)
- fluid dynamics (1)
- fluid dynamics with thermal breakup (1)
- heat conduction (1)
- heiße und dichte Kernmaterie (1)
- hot and dense nuclear matter (1)
- hydrodynami (1)
- kinetic energy (1)
- niobium (1)
- nuclear system (1)
- nucleon and nuclear cross sections (1)
- particle collisions (1)
- photon (1)
- quark gluon plasma (1)
- relativistic (1)
- relativistic heavy-ion reactions (1)
- relativistische (1)
- scalar potential (1)
- temperature (1)
- ultrarelativistic (1)
- ultrarelativistische (1)
- vector potential (1)
- viscosity (1)
Institute
The fluid dynamical model is used to study the reactions 20Ne+238U and 40Ar+40Ca at Elab=390 MeV/nucleon. The calculated double differential cross sections d²ð/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 a strongly impact-parameter-dependent thrust angle θjet(b). NUCLEAR REACTIONS Ar+Ca, Ne+U, Elab=393 MeV/nucleon, fluid dynamics with thermal breakup, double differential cross sections, azimuthal dependence of triple differential cross sections, event-by-event thrust analysis of 4π exclusive experiments.
We investigate the structure of the potential energy surfaces of the superheavy nuclei 158258Fm100, 156264Hs108, 166278112, 184298114, and 172292120 within the framework of self-consistent nuclear models, i.e., the Skyrme-Hartree-Fock approach and the relativistic mean-field model. We compare results obtained with one representative parametrization of each model which is successful in describing superheavy nuclei. We find systematic changes as compared to the potential energy surfaces of heavy nuclei in the uranium region: there is no sufficiently stable fission isomer any more, the importance of triaxial configurations to lower the first barrier fades away, and asymmetric fission paths compete down to rather small deformation. Comparing the two models, it turns out that the relativistic mean-field model gives generally smaller fission barriers.
We present an analysis of high energy heavy ion collisions at intermediate impact parameters, using a two-dimensional fluid-dynamical model including shear and bulk viscosity, heat conduction, a realistic treatment of the nuclear binding, and an analysis of the final thermal emission of free nucleons. We find large collective momentum transfer to projectile and target residues (the highly inelastic bounce-off effect) and explosion of the hot compressed shock zones formed during the impact. As the calculated azimuthal dependence of energy spectra and angular distributions of emitted nucleons depends strongly on the coefficients of viscosity and thermal conductivity, future exclusive measurements may allow for an experimental determination of these transport coefficients. The importance of 4π measurements with full azimuthal information is pointed out.
Angular and energy distributions of fragments emitted from fast nucleus-nucleus collisions (Ne--> U at 250, 400, and 800 MeV/N) are calculated with use of nuclear fluid dynamics. A characteristic dependence of the energy spectra and angular distributions on the impact parameter is predicted. The preferential sideward emission of reaction fragments observed in the calculation for nearly central collisions seems to be supported by recent experimental data.
We have extended the Langevin equations to 4 dimensions (4D) by allowing the independent deformation for the left (δ1) and right fragments (δ2) of the fissioning nucleus. At the moment we are only able to use them in conjunction with the macroscopic transport coefficients. Nevertheless, we can see a considerable improvement in the preliminary results for the fission observables, especially those related to the total kinetic energy (TKE) of fission fragments. By plotting the TKE distributions we have revealed the super-long fission modes in 236U and super-short fission modes in 257Fm. By plotting the distribution of δ against the fragment’s TKE we have noted a correlation between the values of δ and Brosa’s fission modes. We have found that the standard fission modes correspond to prolate tips of the light fragments while the complementary heavy fragments have oblate fission tips. On the other hand, if both fragments were prolate at the tips, we get super-long fission modes. If both fragments were oblate at the tips, we get super-short fission modes.