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Studies of reaction mechanisms for systems forming A = 56 compound nuclei at E/sub lab//A = 6-9 MeV

Thesis/Dissertation ·
OSTI ID:5919254
Two experiments have been performed, one to study incomplete fusion processes and the other damped binary reactions, in the energy region at which these reaction mechanisms begin to compete significantly with complete fusion in light heavy-ion systems. The first experiment involved the measurement of velocity distribution of evaporation residues from reactions of /sup 32/S + /sup 12/C, /sup 24/Mg, /sup 27/Al, /sup 28/Si, and /sup 40/Ca, as well as evaporation residue cross sections for the /sup 32/S + /sup 24/Mg system, at bombarding energies of 194, 239, and 278 MeV. A comparison of the velocity distributions with the predictions of Monte Carlo calculations revealed conclusive evidence of contributions from incomplete fusion, in the form of shifts in the velocity centroids, only for the /sup 32/S + /sup 12/C system. A slight shift in the centroid and some broadening of the distribution was also observed for the /sup 32/S + /sup 24/Mg residues at the highest energies. In the second experiment the two massive products of damped binary reactions of 250 meV /sup 28/Si + /sup 28/Si were detected in coincidence, one in a time-of-flight arm and the other in a large-solid-angle ionization counter. Two components were observed in the measured distributions of exit channel mass asymmetry and total kinetic energy and in the center-of-mass angular distributions. The production cross section for these components, plus the fusion-evaporation cross section, exhausts the reaction cross section.
Research Organization:
Notre Dame Univ., IN (USA)
OSTI ID:
5919254
Country of Publication:
United States
Language:
English

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Related Subjects

651320* -- Nuclear Properties & Reactions
A=6-19
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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALUMINIUM 27 TARGET
ANGULAR DISTRIBUTION
CALCIUM 40 TARGET
CARBON 12 TARGET
CHARGED-PARTICLE REACTIONS
COINCIDENCE METHODS
COMPOUND-NUCLEUS REACTIONS
COUNTING TECHNIQUES
CROSS SECTIONS
DATA
DISTRIBUTION
ENERGY DEPENDENCE
ENERGY LOSSES
ENERGY RANGE
EVAPORATION MODEL
EXPERIMENTAL DATA
HEAVY ION REACTIONS
INCOMPLETE FUSION REACTIONS
INFORMATION
LOSSES
MAGNESIUM 24 TARGET
MASS DISTRIBUTION
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 100-1000
MONTE CARLO METHOD
NUCLEAR MODELS
NUCLEAR REACTIONS
NUMERICAL DATA
SILICON 28 REACTIONS
SILICON 28 TARGET
SPATIAL DISTRIBUTION
SULFUR 32 REACTIONS
TARGETS
VELOCITY