Skip to main content
OSTI.GOVU.S. Department of Energy Office of Scientific and Technical Information
U.S. Department of Energy
Office of Scientific and Technical Information
 

Reaction mechanism studies with 7--35 MeV/nucleon /sup 4/He ions incident on heavy target nuclei

Journal Article · · Phys. Rev., C; (United States)
; ; ; ;

Reaction mechanism studies have been performed on the /sup 4/He+/sup 233/U system at energies of 7--35 MeV/nucleon and on the /sup 4/He+/sup 209/Bi system at 12--35 MeV/nucleon. Measurements included (1) forward-angle elastic scattering, (2) angular distributions and total cross sections for fission, (3) fission-fragment angular correlations, and (4) fragment charge, mass, and energy distributions for /sup 233/U(..cap alpha.., f) at 140 MeV. Total inelastic cross sections and interaction radii were derived from the elastic scattering data. These values were found to be in good agreement with the total cross section for fission for the /sup 233/U+/sup 4/He system, confirming the assumption that sigma/sub R/ approx. = sigma/sub f/. Fission-fragment angular-correlation measurements were performed in order to deduce the distribution of linear momenta which characterize the residual heavy nuclei formed in these collisions. Complete linear momentum transfer probabilities (complete fusion) were also derived for both target-projectile systems as a function of energy. The data are compared with predictions of the proximity potential with one-body energy dissipation and with the intranuclear cascade code. The results of these comparisons are consistent with a picture in which complete fusion dominates the reaction mechanism below 10 MeV/nucleon, but pre-equilibrium processes assume increasing importance above this energy at the expense of fusion. In addition, evidence for a possible reduction in the interaction radius above 20 MeV/nucleon is reported.

Research Organization:
Department of Chemistry and Cyclotron Laboratory, University of Maryland, College Park, Maryland 20742
OSTI ID:
5770702
Journal Information:
Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 20:5; ISSN PRVCA
Country of Publication:
United States
Language:
English

Similar Records

FISSION AND REACTION CROSS SECTIONS IN THE URANIUM REGION WITH 4- TO 12-Mev PROTONS
Journal Article · Sun Mar 22 23:00:00 EST 1964 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D · OSTI ID:4073794
Angular anisotropy of fragments from fission of sup 242 Pu and sup 233 U by neutrons with energy 3. 80--6. 30 MeV
Journal Article · Fri Mar 31 23:00:00 EST 1989 · Soviet Journal of Nuclear Physics (English Translation); (USA) · OSTI ID:5505669
REACTION CROSS SECTIONS OF U$sup 233$ AND U$sup 238$ WITH 18-43 MEV HELIUM IONS
Journal Article · Thu Dec 14 23:00:00 EST 1961 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D · OSTI ID:4820114

Related Subjects

651925* -- Nuclear Properties & Reactions
A=190-219
Experimental-- Nuclear Reactions & Scattering-- (-1987)
652025 -- Nuclear Properties & Reactions
A=220 & above
Experimental-- Nuclear Reactions & Scattering-- (-1987)
652026 -- Nuclear Properties & Reactions
A=220 & above
Experimental-- Spontaneous & Induced Fission-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA REACTIONS
ANGULAR CORRELATION
ANGULAR DISTRIBUTION
BISMUTH 209 TARGET
CHARGED-PARTICLE REACTIONS
CORRELATIONS
CROSS SECTIONS
DISTRIBUTION
ELASTIC SCATTERING
ENERGY LOSSES
ENERGY RANGE
FISSION
FISSION FRAGMENTS
INELASTIC SCATTERING
LOSSES
MEV RANGE
MEV RANGE 10-100
MEV RANGE 100-1000
NUCLEAR CASCADES
NUCLEAR FRAGMENTS
NUCLEAR POTENTIAL
NUCLEAR REACTIONS
POTENTIALS
PRECOMPOUND-NUCLEUS EMISSION
PROBABILITY
SCATTERING
TARGETS
TOTAL CROSS SECTIONS
URANIUM 233 TARGET