Angular distributions in heavy-ion-induced fission

Journal Article · Mon Jul 01 04:00:00 EDT 1985 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.32.195· OSTI ID:5666934

Back, B B; Betts, R R; Gindler, J E; Wilkins, B D; Saini, S; Tsang, M B; Gelbke, C K; Lynch, W G; McMahan, M A; Baisden, P A

Fission fragment angular distributions have been measured in reactions of /sup 16/O+ /sup 208/Pb, /sup 232/Th, /sup 238/U, /sup 248/Cm; /sup 19/F+ /sup 208/Pb; /sup 24/Mg+ /sup 208/Pb; /sup 28/Si+ /sup 208/Pb; /sup 32/S+ /sup 197/Au; and /sup 32/S+ /sup 208/Pb at several bombarding energies. The data are analyzed within the standard theory and it is found that the angular anisotropies for reactions with /sup 24/Mg and heavier projectiles are significantly larger than expected theoretically. Comparative studies of reactions in which different target-projectile combinations are leading to similar fissioning systems show that the large angular anisotropies are associated with the charge (and mass) of the projectile. This excludes large angular momenta and temperatures as the cause of these discrepancies. It is concluded that the onset of the quasifission reaction is responsible for the large observed anisotropies.

• Research Organization: Chemistry Division, Argonne National Laboratory, Argonne, Illinois 60439
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5666934
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 32:1; ISSN PRVCA
• Country of Publication: United States
• Language: English

Related Subjects

651926* -- Nuclear Properties & Reactions
A=190-219
Experimental-- Spontaneous & Induced Fission-- (-1987)
652026 -- Nuclear Properties & Reactions
A=220 & above
Experimental-- Spontaneous & Induced Fission-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR DISTRIBUTION
ANGULAR MOMENTUM
CHARGE DISTRIBUTION
CHARGED-PARTICLE REACTIONS
CORIOLIS FORCE
CROSS SECTIONS
CURIUM 248 TARGET
DATA
DETECTION
DISTRIBUTION
ENERGY RANGE
EXPERIMENTAL DATA
FISSION
FISSION FRAGMENT DETECTION
FLUORINE 19 REACTIONS
GOLD 197 TARGET
HEAVY ION REACTIONS
INFORMATION
LEAD 208 TARGET
MAGNESIUM 24 REACTIONS
MASS SPECTRA
MEV RANGE
MEV RANGE 10-100
MEV RANGE 100-1000
NUCLEAR REACTIONS
NUMERICAL DATA
OXYGEN 16 REACTIONS
PARTICLE PROPERTIES
QUASI-FISSION
RADIATION DETECTION
SILICON 28 REACTIONS
SPECTRA
SPIN
SULFUR 32 REACTIONS
TARGETS
THORIUM 232 TARGET
TOTAL CROSS SECTIONS
URANIUM 238 TARGET