Fission fragment angular distributions for {sup 11}B and {sup 19}F+{sup 238}U systems

Journal Article · Fri Dec 01 04:00:00 EST 1995 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.52.3189· OSTI ID:132947

Karnik, A; Kailas, S; Chatterjee, A; Navin, A; Shrivastava, A; Singh, P; Samant, M S ^[1]

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1. Nuclear Physics Division, Bhabha Atomic Research Centre, Bombay 400 085 (India)

The fission fragment angular distributions were measured at energies above the fusion barrier, for the systems {sup 11}B and {sup 19}F + {sup 238}U. An analysis of the present data along with those already available for the systems {sup 6,7}Li, {sup 12}C, and {sup 16}O + {sup 238}U was made in terms of the saddle-point statistical model. While the anisotropies were ``normal`` for {sup 6,7}Li, {sup 11}B, {sup 12}C+{sup 238}U systems, the ones for {sup 16}O and {sup 19}F+{sup 238}U systems were found to be ``anomalous.`` The entrance channel mass asymmetry dependence of the anisotropies as observed here is consistent with the expectations of preequilibrium fission dynamics. This result emphasizes the importance of preequilibrium fission in heavy-ion induced fusion-fission reactions.

• OSTI ID: 132947
• Journal Information: Physical Review, C, Journal Name: Physical Review, C Journal Issue: 6 Vol. 52; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ANGULAR DISTRIBUTION
ASYMMETRY
BORON 11
CARBON 12
EQUILIBRIUM
FISSION FRAGMENTS
FLUORINE 19 REACTIONS
LITHIUM 6
LITHIUM 7
MASS
OXYGEN 16
OXYGEN 16 REACTIONS
SADDLE-POINT METHOD
STATISTICAL MODELS
URANIUM 238 TARGET