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AbstractAbstract
[en] Collisions between a Zn target and Ar of 14.6, 19.6, 27.6 and 35 MeV/nucleon incident energy cover part of the transition region between reaction mechanisms dominated by the mean field observed at low energy and those resulting from nucleon-nucleon interaction at high energy. Peripheral collisions in this reaction have been studied. Experimental energy spectra for ejectiles having nearly the projectile mass, have been reproduced using diffractional model calculations. The competition between fragmentation and transfer processes in the production of projectile-like fragments shows the persistance of collective effects. The heavy fragments emitted in central collisions have also been investigated. Fusion-evaporation and fusion-fission cross sections have been measured. Incomplete fusion is present at all the incident energies and becomes increasingly preponderant over complete fusion with increasing projectile energy. From comparison with other results, the momentum transfer appears to depend on the asymmetry of the system and on the projectile mass. Fusion disappears slightly above 35 MeV/nucleon which corresponds to a compound nucleus temperature of about 7 MeV. The characteristics of the charged light particles emitted in the reaction have been studied, and analyzed with several models: moving source, preequilibrium emission and coalescence model
[fr]
Les collisions entre des ions Zinc et des ions Argon d'energie egale a 14.6, 19.6, 27.6 et 35 MeV/nucleon ont permis l'etude des phenomenes transitionnels entre les mecanismes de reaction domines par le champ nucleaire moyen tels qu'on les observe a basse energie et ceux resultant des interactions nucleon-nucleon mis en evidence a haute energie. Les collisions peripheriques ont ete etudiees. Les spectres d'energie des ejectiles de masse proche de celle du projectile ont ete analyses dans le cadre du modele diffractionnel. La competition entre les mecanismes de fragmentation du projectile et de transfert quasi-elastique a ete mise en evidence puis analysee. La persistance d'effets collectifs a ete demontree. Les fragments lourds emis lors de collisions centrales ont ete analyses. Les sections efficaces de fusion-evaporation et fusion-fission ont ete mesurees. La fusion incomplete est presente a toutes les energies incidentes etudiees, et devient de plus en plus preponderante par rapport a la fusion complete quand l'energie incidente augmente. Compare a d'autres resultats, le moment lineaire transfere montre une dependance en fonction de l'asymetrie du systeme et de la masse du projectile. La fusion disparait a une energie legerement superieure a 35 MeV/nucleon qui correspond a une temperature de 7 MeV. Les caracteristiques de l'emission des particules legeres dans la reaction ont ete etudiees et analysees en terme de modeles theoriques divers: modele des sources en mouvement, d'emission de preequilibre et de coalescenceOriginal Title
Transition entre les phenomenes gouvernes par le champ moyen et ceux regis par les collisions nucleon-nucleon dans la reaction 40 Ar + 68 Zn
Primary Subject
Source
1986; 112 p; These (D. es Sc.).
Record Type
Report
Literature Type
Thesis/Dissertation
Report Number
Country of publication
ANGULAR MOMENTUM TRANSFER, ARGON 40 BEAMS, COALESCENCE, COLLECTIVE MODEL, DIFFRACTION MODELS, ENERGY SPECTRA, EVAPORATION MODEL, HEAVY ION FUSION REACTIONS, MEAN-FIELD THEORY, MEV RANGE 10-100, NUCLEAR FRAGMENTATION, NUCLEAR FRAGMENTS, NUCLEON-NUCLEON INTERACTIONS, PERIPHERAL COLLISIONS, QUASI-ELASTIC SCATTERING, ZINC 68 TARGET
BARYON-BARYON INTERACTIONS, BASIC INTERACTIONS, BEAMS, ENERGY RANGE, HADRON-HADRON INTERACTIONS, HEAVY ION REACTIONS, INTERACTIONS, ION BEAMS, MATHEMATICAL MODELS, MEV RANGE, MOMENTUM TRANSFER, NUCLEAR MODELS, NUCLEAR REACTIONS, NUCLEOSYNTHESIS, PARTICLE INTERACTIONS, PARTICLE MODELS, SCATTERING, SPECTRA, STRONG INTERACTIONS, SYNTHESIS, TARGETS
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