Entrance-channel dependence of fission-fragment anisotropies: A direct experimental signature of fission before equilibration

Journal Article · Mon Jul 02 04:00:00 EDT 1990 · Physical Review Letters; (USA)

DOI:https://doi.org/10.1103/PhysRevLett.65.25· OSTI ID:7057412

Ramamurthy, V S; Kapoor, S S; Choudhury, R K; Saxena, A; Nadkarni, D M; Mohanty, A K; Nayak, B K; Sastry, S V; Kailas, S; Chatterjee, A; Singh, P; Navin, A ^[1]

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1. Nuclear Physics Division, Bhabha Atomic Research Center, Bombay 400085 (India)

Fission-fragment angular distributions in reactions of {sup 10}B, {sup 12}C, {sup 16}O+{sup 232}Th and {sup 237}Np, and {sup 19}F+{sup 237}Np have been measured. While the measured anisotropies in B- and C-induced fission are found to be in agreement with the predictions of the standard Halpern-Strutinsky theory, they are anomalously large in the case of O- and F-induced fission. Such a discontinuous behavior in angular anisotropy with respect to the entrance-channel mass-to-charge asymmetry provides an experimental verification of the predictions of the preequilibrium fission model proposed earlier to explain the anomalous fragment angular distributions.

• OSTI ID: 7057412
• Journal Information: Physical Review Letters; (USA), Journal Name: Physical Review Letters; (USA) Vol. 65:1; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

651320* -- Nuclear Properties & Reactions
A=6-19
Experimental
652020 -- Nuclear Properties & Reactions
A=220 & above
Experimental
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA PARTICLES
ANGULAR DISTRIBUTION
BORON 10 REACTIONS
CARBON 12 REACTIONS
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
DATA
DISTRIBUTION
ELASTIC SCATTERING
ENERGY RANGE
EXPERIMENTAL DATA
FISSION
HEAVY ION REACTIONS
INFORMATION
MEV RANGE
MEV RANGE 10-100
NEPTUNIUM 237 TARGET
NUCLEAR FRAGMENTATION
NUCLEAR REACTIONS
NUMERICAL DATA
OXYGEN 16 REACTIONS
RUTHERFORD SCATTERING
SCATTERING
TARGETS
THORIUM 232 TARGET