Studies of heavy ion reactions and transuranic nuclei. Progress report, August 1, 1983-August 31, 1984

Technical Report · Wed Aug 01 04:00:00 EDT 1984

OSTI ID:6529782

Huizenga, J R; Schroeder, W U

The status of the current understanding of the microscopic mechanisms operating in damped nuclear reactions is reviewed. Several experimental and conceptual problems of attempts to determine the nuclear interaction potential for distances inside the fusion barrier are discussed. An explanation of the unexpectedly large angular anisotropies of fragments from fission of heavy systems produced at large spins has been found in terms of the statistical scission model. In this model, the phase space available to the final deformed fission fragments governs the fission probability. Processes associated with incomplete linear-momentum transfer have been studied for 292-MeV /sup 20/Ne-induced fission with targets of /sup 165/Ho, /sup 181/Ta, /sup 197/Au, /sup 209/Bi, and /sup 238/U. Preequilibrium neutron emission has been studied in central and peripheral /sup 165/Ho + /sup 20/Ne and /sup 165/Ho + /sup 12/C collisions at bombarding energies between 11 and 25 MeV/nucleon. In preparation of kinematically complete coincidence experiments, a fast, position-sensitive avalanche detector with a large active area has been developed. The theoretical framework of the statistical scission model for fission has been reconsidered. Exclusive measurements were made of alpha particles emitted in the damped reaction /sup 165/Ho + /sup 56/Fe at E/sub Lab/ = 465 MeV. The data were interpreted with the aid of rather detailed Monte Carlo evaporation simulations. As part of an extensive coincidence study of equilibration mechanisms in damped reactions, inclusive measurements of projectile-like and fusion-fission-like fragments have been performed for the /sup 197/Au + /sup 51/V system at E/sub Lab/ = 447 MeV. The damped reaction features have been interpreted in terms of phenomenological reaction models. (WHK)

• Research Organization: Rochester Univ., NY (USA). Dept. of Chemistry and Physics
• DOE Contract Number: AC02-76ER03496
• OSTI ID: 6529782
• Report Number(s): DOE/ER/03496-79; COO-3496-79; ON: DE84016629
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACTINIDE NUCLEI
ANGULAR DISTRIBUTION
BISMUTH 209 TARGET
CARBON 12 REACTIONS
CHARGED-PARTICLE REACTIONS
DEEP INELASTIC HEAVY ION REACTIONS
DISTRIBUTION
ELEMENTS
EMISSION
FISSION
FISSION FRAGMENTS
FUSION REACTIONS
GOLD 197 TARGET
HEAVY ION REACTIONS
HEAVY NUCLEI
HOLMIUM 165 TARGET
IRON 56 REACTIONS
KINETICS
LINEAR MOMENTUM TRANSFER
MATHEMATICAL MODELS
MOMENTUM TRANSFER
NEON 20 REACTIONS
NEUTRON EMISSION
NUCLEAR FRAGMENTS
NUCLEAR MODELS
NUCLEAR POTENTIAL
NUCLEAR REACTION KINETICS
NUCLEAR REACTIONS
NUCLEI
POTENTIALS
PRECOMPOUND-NUCLEUS EMISSION
REACTION KINETICS
RESEARCH PROGRAMS
TANTALUM 181 TARGET
TARGETS
TRANSURANIUM ELEMENTS
URANIUM 238 TARGET