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Suraud, E.; Gregoire, C.
Grenoble - 1 Univ., 38 (France). Inst. des Sciences Nucleaires1988
Grenoble - 1 Univ., 38 (France). Inst. des Sciences Nucleaires1988
AbstractAbstract
[en] Heavy ion collisions permit to study the effects of nuclear viscosity, which represent the global consequence of the multiple nucleon-nucleon interactions during a collision. But the characteristic timelength of these phenomena is 10-22 s while the detectors precision hardly reach 10-9 s. It is therefore necessary to use a theoretical simulation. Only recently, a semi-classical approximation showed the nuclear-viscosity phenomenon. This approximation is represented by the Landau-Vlasov equation. Convenient solutions have recently be found. Less precise on the quantic point of view than the Hartree-Fock equation precedently used, Landau-Vlasov equation permits to study viscosity in nuclei, which is quite essential for the comprehension of two of the four fundamental interactions of nature
[fr]
Les collisions d'ions lourds ont permis de mettre en evidence les effets de la viscosite nucleaire. Cette grandeur permet de comprendre et de se representer l'effet global des multiples interactions nucleons-nucleons mises en jeu au cours d'une collision. Les grandeurs temporelles qui caracterisent ces evenements sont de 10-22 s. Celles accessibles par les detecteurs sont de 10-9 s. D'ou la necessite de faire appel aux simulations theoriques. Celles-ci sont fondees sur une approximation semi-classique, representee par l'equation de Landau-Vlasov pour laquelle des solutions approchees convenables ont ete recemment trouvees. On modelisait auparavant l'equilibre nucleaire par l'equation de Hartree-Fock qui, plus precise au niveau des grandeurs quantiques, ne met pas en evidence la viscosite essentielle lors des chocs entre ions lourds. L'etude de la viscosite nucleaire s'avere essentielle pour la comprehension de deux des quatre interactions fondamentales de la natureOriginal Title
La viscosite nucleaire
Primary Subject
Source
1988; 37 p
Record Type
Report
Report Number
Country of publication
BOLTZMANN-VLASOV EQUATION, CARBON 12 BEAMS, CARBON 12 TARGET, DYNAMICS, GANIL CYCLOTRON, HARTREE-FOCK METHOD, HEAVY ION FUSION REACTIONS, ION-ATOM COLLISIONS, LANTHANUM 139 TARGET, NUCLEAR CORES, NUCLEAR TEMPERATURE, NUCLEON-NUCLEON INTERACTIONS, PAULI PRINCIPLE, QUANTUM MECHANICS, ROTATIONAL STATES, SIMULATION, SQUARE-WELL POTENTIAL, VIBRATIONAL STATES, VISCOSITY, WAVE FUNCTIONS
ACCELERATORS, ATOM COLLISIONS, BARYON-BARYON INTERACTIONS, BEAMS, COLLISIONS, CYCLIC ACCELERATORS, CYCLOTRONS, DIFFERENTIAL EQUATIONS, ENERGY LEVELS, EQUATIONS, EXCITED STATES, FUNCTIONS, HADRON-HADRON INTERACTIONS, HEAVY ION ACCELERATORS, HEAVY ION REACTIONS, INTERACTIONS, ION BEAMS, ION COLLISIONS, ISOCHRONOUS CYCLOTRONS, MECHANICS, NUCLEAR POTENTIAL, NUCLEAR REACTIONS, NUCLEOSYNTHESIS, PARTIAL DIFFERENTIAL EQUATIONS, PARTICLE INTERACTIONS, POTENTIALS, SYNTHESIS, TARGETS
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